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Re: 'Potentially catastrophic' Hurricane Irma nears eastern Caribbean islands

Just In: NOAA Hurricane Hunters Flight Director says #Irma is getting stronger still. The eye is 24kms wide. 914hPa.

Source: WeatherWatch.co.nz

Posted on September 07, 2017 at 12:56 AM

Re: 'Potentially catastrophic' Hurricane Irma nears eastern Caribbean islands

Hurricane Irma: Powerful storm blamed for 3 deaths, 90% of Barbuda destroyed
Posted by WW Forecast Team on Thu, 07/09/2017 - 10:37

Hurricane Irma is battering the northern Virgin Islands and hurtling toward Puerto Rico after smashing a string of small northern Caribbean islands, where at least three people were killed. CNN is reporting that up to 90% of Barbuda (an island Irma directly hit last night) has been destroyed.

Irma is one of the strongest storms ever recorded in the Atlantic. The storm is one of three hurricanes in the Atlantic basin, the first time in seven years there have been a trio of hurricanes at the same time in that part of the world.
Irma's core slammed Barbuda before moving over St. Martin and Anguilla and parts of the British Virgin Islands. Its maximum sustained winds of 300km/h were well above the 250km/h threshold of a Category 5 storm. Gusts are up to 370km/h.

Irma's powerful center will pass just north of Puerto Rico -- a US territory of about 3.4 million people -- on Wednesday evening (Thursday NZT), bringing heavy rain and dangerous coastal storm surges, forecasters said.

CNN's Leyla Santiago, in the Puerto Rican capital of San Juan, said there were already power outages as strong winds lashed the island and the center of the storm moved just off the northeast coast.

Gov. Ricardo Rosselló urged Puerto Ricans in flood-prone areas to head to designated shelters.

"Please allow us to help you seek refuge in shelter, and let people know the priority is to weather the storm (and) seek safe haven," Rossello said.

On Tortola, the largest of the British Virgin Islands, Kennedy Banda said fierce winds blew out the windows of his home. He and his family were taking shelter in a bathroom; he said he was bracing his body against the door in an attempt to keep it shut.
"Everything is blown out," he told CNN by phone near Road Town. "Everything is gone."
Earlier, he posted video on Facebook showing wind and pounding rain whipping the shoreline as Irma's core approached.
The hurricane earlier battered a string of northern Caribbean island nations, situated east of the more populous Virgin Islands group and Puerto Rico.
Early reports suggested damage on parts of the smaller islands, a tropical region popular with tourists. Barbuda, home to about 1,600 people, was "so badly damaged that there is no communication" from the island, said Keithley Meade, director of a meteorological office in Antigua and Barbuda.
"We have a lot of broken trees across the island," Meade said from Antigua, whose 80,000 people comprise most of the two-island nation's population.


Irma destroyed four of the most solid government buildings on the French-administered portion of nearby St. Martin, an island of about 75,000 people, French Interior Minister Gérard Collomb said in Paris.
It's likely that all other older buildings there have at least been damaged, he said. Parts of the Caribbean island of St. Martin are left flooded Wednesday after Irma hit.


Roughly 10 of these smaller islands -- such as St. Martin, Antigua and Barbuda, and St. Kitts and Nevis -- were pounded by hurricane conditions. One, Guadeloupe, has about 405,000 residents. The rest have about 264,400 people combined.
- LATEST DEVELOPMENTS - Click here for full ongoing news, videos, via CNN.com
*WeatherWatch.co.nz is a CNN Weather affiliate

Posted on September 07, 2017 at 12:00 AM

Thursday's national forecast

Posted by WW Forecast Team on Thu, 07/09/2017 - 03:57

A brisk to strong northwesterly airflow lies over New Zealand today.

Northland, Auckland, Waikato & Bay Of Plenty
Spring-like breezy to brisk, Westerly winds. Showers for much of the day (possibly heavy) with the odd sunny spell, more so in the east.
Highs: 14-17

Western North Island (including Central North Island)
Areas of rain, possibly heavy at times with a risk of thunderstorms. Drier periods develop overnight. Gusty west to northwesterly winds, winds may gust to gale about the coast.
Highs: 10-14

Eastern North Island
Any morning spots of rain clear then mostly sunny with a few clouds at times, gusty northwesterly winds.
Highs: 17-19

Early rain eases to showers and sunny spells, winds strong from the northwest gusting to gale at times.
Highs: 13-14

Marlborough & Nelson
Any early rain clears then expect sunny areas and some high cloud, Nelson may see a few showers spread from the west in the afternoon. Brisk gusty northwesterly winds.
Highs: 14-16

Any early spots of rain clear then mostly sunny with high cloud decreasing. Gusty northwesterly winds.
Highs: 14-16

West Coast
Rain, heavy at times with possible thunderstorms. Gusty northwesterly winds tending more westerly in the afternoon.
Highs: 9-11

Southland & Otago
Early rain clears then showers move in during the afternoon as northerlies change gusty westerly. Showers clear in the evening for most.
Highs: 11-14

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on September 06, 2017 at 4:58 PM

Re: 'Potentially catastrophic' Hurricane Irma nears eastern Caribbean islands

Category 5 Hurricane Irma makes landfall, Absolutely stunning pressure drop
Posted by WW Forecast Team on Wed, 06/09/2017 - 18:42

Hurricane Irma has made landfall in the Caribbean Islands as an historical Category 5 hurricane (and is still tracking towards Florida) - the island it made landfall on is tiny and will not impact the power of the storm.

A short time ago Irma crossed the island of Barbuda, home to around 2000 people.

Incredibly, the air pressure fell 50hPa (millibars) in just one hour.

A "weather bomb" which is a term uniquely used frequently (and often incorrectly) by large news media outlets in New Zealand, is a low pressure system that drops 24hpa (millibars) across an entire day.

Irma has sustained winds - these are winds that are nonstop at this speed - at 300km/h ... and gusts to almost 370km/h.

Irma is now the strongest storm in Atlantic history.

The 2017 hurricane season is very similar, so far, to the 2005 hurricane season that produced historic storms Rita and of course Katrina. It seems 2017 has pushed the records up yet another notch as the planet continues to slowly warm up.


Posted on September 06, 2017 at 4:56 PM

'Potentially catastrophic' Hurricane Irma nears eastern Caribbean islands

Posted by WW Forecast Team on Wed, 06/09/2017 - 10:41

Category 5 Hurricane Irma has become one of the strongest storms recorded in the Atlantic, and is threatening to slam into Caribbean islands including Puerto Rico and the Virgin Islands with "potentially catastrophic" force on Wednesday, the National Hurricane Center said.
It's too early to tell whether the storm will affect the US mainland, but current forecast tracks show it could turn toward Florida over the weekend.
Irma was churning west Tuesday evening in the Atlantic with maximum sustained winds of 185 mph -- well above the 300km/h threshold for a Category 5 -- about 200kms east of Antigua and Barbuda, the hurricane center said.
The last storm with sustained winds that strong in the Atlantic was 2005's Hurricane Wilma, which weakened before it brushed Mexico's Yucatan Peninsula and crossed Florida. Its Atlantic wind speeds are behind only 1980's Hurricane Allen, which peaked at 305km/h at sea.
Irma's forecast track currently has it near or over Antigua and Barbuda, St. Kitts and Nevis, and Anguilla by early Wednesday, and the British and US Virgin Islands and Puerto Rico on Wednesday afternoon.

Preparations to protect life and property in those areas "should be rushed to completion," the hurricane center said in a 5 p.m. ET advisory.
"We could see storm surges of 7 to 11 feet (2 to 3.5 metres) -- that's certainly life-threatening -- and very, very heavy flooding rainfall" in the far northeastern Caribbean islands as well as winds that could cause catastrophic damage near the eye wall, the hurricane center's Michael Brennan said.

Computer models show the system possibly near the Dominican Republic, Haiti and the Turks and Caicos Islands on Thursday and Friday, and Cuba on Friday and Saturday -- and potentially turning north toward Florida by the weekend.
- Track Irma here via CNN
- Read more from CNN on Irma here
- Watch CNN on Sky Channel 087 in New Zealand for ongoing updates. 
- WeatherWatch.co.nz will have special updates once Irma approaches the US, most likely this weekend.http://www.weatherwatch.co.nz/content/potentially-catastrophic-hurr...


Posted on September 06, 2017 at 12:40 AM

Wednesday's national forecast

Posted by WW Forecast Team on Wed, 06/09/2017 - 03:56

A gusty northwesterly airflow lies over the country today with a front slowly moving over the upper North Island during the day.

Northland, Auckland, Waikato & Bay Of Plenty
Areas of rain, possible heavy at times with a risk of thunderstorms gradually pushing northwards through these regions then easing later in the evening. Sunny spells may break through at times. Northwesterly winds.
Highs: 17-18

Western North Island (including Central North Island)
Early heavy rain eases to showers and sunny spells, the odd shower may be heavy. Breezy northwesterly winds.
Highs: 13-16

Eastern North Island
Some morning rain then becoming mostly sunny, gusty northwesterly winds.
Highs: 18-20

Morning rain clears, developing again overnight (sunny spells between). Strong Nor'West winds may gust to gale at times.
High: 15

Marlborough & Nelson
Mostly sunny about Marlborough, Nelson sees early rain ease to the odd shower and sunny spells. Gusty north to northwesterly winds, some overnight rain.
Highs: 15-17

Sunny areas and some high cloud, some rain in the high country. Gusty northwesterly winds, perhaps strong for a time in the afternoon.
Highs: 15-17

West Coast
Rain, heavy at times with a chance of thunderstorms. Breezy northwesterly winds.
Highs: 12-14

Southland & Otago
Early rain then sunny spells and some high cloud, there may be the odd spot of rain at times otherwise mainly dry. Northwesterly winds.
Highs: 11-14

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on September 05, 2017 at 4:55 PM

NZ has several days of low pressure: We track the rain, wind, snow & sun

Posted by WW Forecast Team on Tue, 05/09/2017 - 10:50

Weather over the next several days in New Zealand will be typically spring-like, but that may not be the news you're wanting as rain, gales and even snow are forecast before the start of next week.

With a large area of low pressure around the Southern Ocean and southern South Island - coupled with high pressure well north of New Zealand and over Australia - our nation is stuck in a several day rut of wind and rain. That also means some are sunny and dry though, as is the nature of a true spring set up.

Focused mainly in the west of both islands it means the West Coast, Nelson, Taranaki, Manawatu, Waikato and Auckland are all exposed to more rain, with heavy falls and isolated thunderstorms (the Live tracker is quite active west of the North Island).

The West Coast of the South Island is most likely to have many hours (days even) of set in rain, while the North Island will have rain clouds more broken up along with dry spells, showers and even sunny spells.  

As these lows remain churning around southern New Zealand and the Southern Ocean we can expect surges of rain in the west over the next 24 hours, then perhaps again on Thursday, with brief breather on Friday before more rain over the weekend. By Sunday the air flow turns southerly and rain in the west finally fades out. This southerly change may see a bit of weather wet moving into eastern regions of both main islands.

A typically blustery spring week ahead with westerly quarter winds becoming strong at times - but not damaging for the most part. This wind event will be annoying for some, frustrating for others, and help lift pollen levels (by shaking spring pollen from trees and carrying the allergens in the air - creating for more sneezing!). We don't expect winds to be strong enough to cause issues for most travellers.  

Winds will surge off and on from the westerly quarter over the next several days and will become colder as we head into the weekend and they turn more southerly.

With such blustery westerlies and the bulk of the rain (90% of it) falling in the west it should make for sunny/dry weather in eastern areas for the most part. There will be spits of rain spilling over from the west at times, and a few bursts of rain or showers during the main fronts. But the general trend is for eastern areas, like Hawke's Bay and Canterbury, to be fairly dry near the coast. Eastern Northland and the Far North may also have more settled weather (less wind and rain overall).

With windy westerlies temperatures can really fluctuate. The air flow around the North Island will be warmer than the South Island so expect places like Hawke's Bay to reach the low to mid 20s on Wednesday under the nor'wester. Highs in the late teens/around 20 are expected in the east of the North Island all week, before dropping back this weekend as winds shift more southerly.

The east of the South Island also looks mild to some degree, but highs over 20 degrees look less likely. Frost free weather is expected in the east though. Christchurch has overnight lows between 3 and 7 degrees over the next week.

Western and northern areas will have fairly flat temperatures with a lot of cloud about and air coming off the Tasman Sea, so it won't be as warm as those in the east but the overnight temperatures will be well above average. Waikato can have some pretty big frosts in early September but double digit overnight lows for much of this week means frosts won't be a concern.

Colder weather arrives at the weekend and into Sunday and Monday for many areas. Temperatures drop quite a bit. For example Hamilton has an overnight low of 12 degrees tonight. On Sunday that is the forecast high for Hamilton City at this stage. Wellington may only reach 11 degrees on Sunday while Dunedin has a high of 8.

Over the weekend Queenstown has highs of just 5 degrees and overnight lows down to -2 with snow flurries in the area. Snow doesn't look to be major for farmers at this early stage, it seems a mostly short snowy event for the ski fields but may bring 24 to 36 hours of stressful wind-chills for newborn stock and snow flurries down to a few hundred metres for a time.

Where will the heaviest rain be? Areas in red show a wetter than average forecast while areas in blue indicate drier than usual / US Government, US Taxpayers.

- WeatherWatch.co.nz 

Posted on September 05, 2017 at 12:23 AM

Tuesday's national forecast

Posted by WW Forecast Team on Tue, 05/09/2017 - 04:00

A northerly airflow increases today ahead of a front which moves onto the South Island in the afternoon then further north later in the evening.

Northland, Auckland, Waikato & Bay Of Plenty
Sunny areas and increasing cloud, evening showers in the west for some then turning to rain overnight. West to northwesterly winds.
Highs: 17-19

Western North Island (including Central North Island)
Sunny spells, cloud increasing from afternoon then expect evening showers, overnight rain possibly heavy. Taranaki sees skies cloud up a bit earlier then elsewhere in the west, rain moves in late afternoon possibly becoming heavy in the evening. Freshening northwesterly winds.
Highs: 14-16

Eastern North Island
A sunny day with some evening high cloud then the chance of a few late / overnight spots of rain, light winds tend northeasterly in the afternoon then die away in the evening. Wairarapa sees northwesterlies for much of the day.
Highs: 15-18

Becoming mostly cloudy in the morning, patchy showers or rain later in the evening. Freshening northwesterly winds.
High: 14

Marlborough & Nelson
Mostly sunny then high cloud thickens up after midday for Marlborough, a few spots of rain late afternoon then clearing later in the evening. Nelson sees cloud increase in the morning, some rain in the afternoon then clearing later in the evening also. Increasing north to northwesterly winds.
Highs: 14-17

Mostly sunny with some high cloud, there may be a spot of rain about South Canterbury late morning / around midday then clearing. Breezy northeasterly winds tend northwest overnight.
Highs: 14-16

West Coast
Showers develop in the morning, afternoon rain. Late evening / overnight rain with heavy falls and thunderstorms are possible. Northeasterly winds tend northwest in the evening.
Highs: 13-14

Southland & Otago
Any early spots of rain clear then some sun breaks through in the afternoon, further spots of rain possible overnight. Northeast winds tend northwest late afternoon.
Highs: 15-17

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on September 05, 2017 at 12:19 AM

A third of Bangladesh under water as flood devastation widens

Posted by WW Forecast Team on Sun, 03/09/2017 - 13:17

In rural areas across northern Bangladesh families are preparing to mark Eid al-Adha, one of the holiest dates on the Muslim calendar.

The holiday, which translates literally as the "sacrifice feast," is intended to be a time of great celebration. In small villages and towns, such as Beraberi some 134 kilometers northwest of Dhaka, residents spent much of the last year hand-rearing goats and cows in anticipation of the annual festivities.

Then the rains began to fall.

As the world's media trains its sights on the tragic events in Texas and Louisiana, another water-driven catastrophe is unfolding in villages like Beraberi throughout Bangladesh and parts of Nepal and India.

There, the International Federation of Red Cross and Red Crescent Societies (IFRC) estimates that at least 1,200 have died and more than 41 million people have been affected by monsoon rains and severe flooding as of June this year.

The rains are now moving northwest towards Pakistan, where more devastation is expected.
At its peak on August 11, the equivalent to almost a week's worth of average rainfall during the summer monsoon season was dumped across parts of Bangladesh in the space of a few hours, according to the country's Meteorological Department, forcing villagers in low-lying northern areas to grab what few possessions they could carry and flee their homes in search of higher ground.
And still the rains keep coming. In Bangladesh alone, floods have so far claimed the lives of 142 people, and impacted over 8.5 million.
In Beraberi, one of numerous island villages know as "chars" dotted along the Jamuna River, entire homes have been washed away, and crops and food supplies -- including livestock -- all but wiped out. When aid workers carrying relief parcels from the IFRC arrived by helicopter earlier this week, villagers described the rains as the "worst in living memory."

"People were fearful they would soon begin to starve," says Corinne Ambler, who was among the IFRC team who visited the village. "They are used to seasonal flooding but nothing to this degree, this is a different level -- for miles around all you can see is water, the flooding has transformed the countryside."
Read the full story + photos/video via CNN here

Posted on September 03, 2017 at 11:21 PM

Why Spring doesn't have Summer weather

Posted by WW Forecast Team on Mon, 04/09/2017 - 10:39

Two thirds of New Zealanders consider spring has already begun yet over the weekend one comment stood out to us: "So much for spring weather". 

So what do people expect when spring arrives? Well for one thing, it's certainly not summer!
"I define the first half of spring in New Zealand as winter fading away slowly and hints of summer coming in" says WeatherWatch head forecaster Philip Duncan. "Just because you open the freezer door doesn't mean everything inside immediately becomes warm and room temperature, it takes time to warm up and spring is the same when it first arrives".

In fact September is well known for having random snow storms and this can be a huge stress for farmers. "Many farmers can cope with a snow storm in winter better than early spring as once September arrives they have much more newborn stock so spring snow storms can prove more deadly" says Duncan. "Likewise we can have cold days and frosts through September and October which is a huge headache for vineyards as frosts in spring can damage future crops".

October can sometimes be one of our stormiest months too, with a real battle between the departing cold winter and the incoming heat of summer. This can create more severe weather warnings and thunderstorms. Then, usually, November switches into a milder, drier pattern with westerlies fading as we head towards December.

"Early Spring weather is changeable and this week is a classic spring set up with a warm start to the week with highs over 20 degrees in some northern and eastern areas, then later in the week we have windy westerly quarter winds, rain and showers and then colder air in the south bringing snow to the ranges and ski fields" says Mr Duncan.

- Wednesday PM rainmap / Weathermap/GFS

- WeatherWatch.co.nz

Posted on September 03, 2017 at 11:15 PM

Monday's national forecast

Posted by WW Forecast Team on Mon, 04/09/2017 - 04:00

A ridge brings slightly more settled weather then we have been having recently, still, some cold upper air enhances a few showers over parts of the North Island especially in the afternoon.

Northland, Auckland, Waikato & Bay Of Plenty
A mix of sun and cloud, chance of an afternoon shower for Northland and Auckland. Southwesterly winds.
Highs: 15-17

Western North Island (including Central North Island)
Sunny spells with a shower or two possible, mainly afternoon. Westerly winds.
Highs: 10-14

Eastern North Island
Sunny spells, chance of a shower or two. Southwesterly winds die out in the evening.
Highs: 13-15

Morning cloud breaks to mostly sunny weather, southerlies die out in the afternoon.
High: 12

Marlborough & Nelson
Morning cloud breaks to mainly sunny weather, afternoon northeasterly winds. Some cloud about Nelson and the Marlborough Sounds brings the risk of a shower or two during the day.
Highs: 13-14

Morning cloud breaks to mainly sunny weather, afternoon easterly winds.
High: 11

West Coast
Mostly sunny, cloud a little more frequent afternoon onwards then thickening in the evening bringing the chance of a light shower or two. Light winds.
Highs: 13-15

Southland & Otago
Mainly sunny with northeasterly winds, freshening about coastal Otago.
Highs: 11-15

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on September 03, 2017 at 11:11 PM

Australia: Soggy start to spring in Perth

Posted by WW Forecast Team on Fri, 01/09/2017 - 15:27

It's a cool and showery start to spring in Australia's southwest today after Perth came close to its first wetter-than-average winter in 17 years.

A cold front crossing the South West Land Division of WA this morning will produce a burst of showers and blustery winds. This wintry system will also produce thunderstorms and small hail in some areas of the state's south and could even cause a flurry of snow on the Stirling Range tonight.

Roads were damp in Perth this morning after 8mm of rain fell in the city overnight. Heavier falls were recorded in northern and eastern suburbs, including 19mm at Werribee and 18mm at Pearce as of 6am WST.

Today's sodden start to spring follows on from Perth's wettest winter in six years, with the city collecting 412mm of rain during the season. 

Despite this being the best winter rain since 2011, it was more than 50mm short of the long-term seasonal average and became Perth's 17th consecutive drier-than-average winter.

Temperatures were close to a degree warmer than usual in Perth during winter, although it didn't stand out from recent years statistically. Last year was cooler and 2015 was warmer.

Looking ahead, drier-than-usual weather is expected over Australia's southwest during spring.

- By Ben Domensino, Weatherzone

Posted on September 01, 2017 at 5:36 AM

Harvey aftermath: More chemical fires possible as city loses clean water

Posted by WW Forecast Team on Fri, 01/09/2017 - 10:23

Flood-stricken southeast Texas struggled Friday NZT with a new series of blows that left one city without running water, the operators of a flood-damaged chemical plant warning of additional fires and at least one hospital unable to care for patients.

Nearly a week after Hurricane Harvey slammed into the Texas coast, desperate residents remain stranded without food and water in the wake of unprecedented flooding. Meanwhile, authorities continue to search for survivors and make helicopter rescues from rooftops as the death toll from Harvey and its aftermath climbed to at least 39.

Given the disaster's scope, the commanding officer who led the federal response to Hurricane Katrina a dozen years ago questioned the adequacy of current relief efforts.

"When you have a combination of hurricane winds, flooding now for five days and you start losing the water and the electric grid, this is a game changer," retired Lt. Gen. Russel Honoré told CNN.

"Losing electricity itself is a disaster for over a 24-hour period in America to any person because we lose access to water, we lose access to sewers, we lose our ability to communicate."

The dangers emerging from the historic storm seem to increase by the day.

Beaumont, east of Houston, has no running water after both its water pumps failed, forcing a hospital to shut down. City officials could not say when service would be restored.

In Crosby, two blasts rocked a flooded chemical plant, and more could come.

And in Houston, authorities were looking door-to-door for victims, hoping to find survivors but realizing that the death toll could rise.

Company warns of more blasts
A pair of blasts at the Arkema chemical plant in Crosby sent plumes of smoke into the sky Thursday night NZT, and the company warned more blasts could follow.

"We want local residents to be aware that product is stored in multiple locations on the site, and a threat of additional explosion remains," Arkema said. "Please do not return to the area within the evacuation zone until local emergency response authorities announce it is safe to do so."

Overheated organic peroxides caused blasts at a chemical plant in Crosby.

Overheated organic peroxides caused blasts at a chemical plant in Crosby.

The twin blasts Thursday happened after organic peroxides overheated. The chemicals need to be kept cool, but the temperature rose after the plant lost power, officials said.

Containers popped. One caught fire and sent black smoke 30 to 40 feet into the air.

The thick smoke "might be irritating to the eyes, skin and lungs," Arkema officials said.

Fifteen Harris County sheriff's deputies were hospitalized, but the smoke they inhaled was not believed to be toxic, the department said. The deputies have all been released.

Harris County Sheriff Ed Gonzalez said nothing toxic was emitted and there was no imminent danger to the community.

Three other containers storing the same chemical are at risk of "overpressurization," said Jeff Carr of Griffin Communications Group, which is representing Arkema.

Arkema shut down the facility as Harvey approached last week. The company evacuated everyone within 1.5 miles of the plant as a precaution after it was flooded under more than 5 feet of water.

The company has said there's a small possibility the organic peroxide, which is used in the production of plastic resins, could seep into floodwaters, without igniting or burning.

Harvey forced the shut down of many chemical or oil plants, including the Colonial Pipeline, which carries huge amounts of gasoline and other fuel between Houston and the East Coast. Valero and Motiva, the largest refinery in the country, have also closed some facilities.

- Read the full story here, via CNN.com

Posted on August 31, 2017 at 11:58 PM

Friday's national forecast

Posted by WW Forecast Team on Fri, 01/09/2017 - 04:00

A low east of New Zealand directs a southerly quarter airflow over the South Island and lower North Island today. The upper North Island mostly has low pressure which becomes more organised overnight as a low centre moves in from the northwest.

Northland, Auckland, Waikato & Bay Of Plenty
A risk of early fog then cloud builds, showers at times especially from afternoon with a risk of heavy falls. Overnight rain moves into some eastern areas. Light winds.
Highs: 16-17

Western North Island (including Central North Island)
Cloudy areas with a few showers possible, more so in the afternoon otherwise mainly dry. Parts of northern Taranaki and the Central North Island sees late afternoon / evening rain. South to southeasterly winds.
Highs: 10-15

Eastern North Island
Early rain about the Wairarapa eases to the odd shower by midday, dry further north with some sun then isolated showers possible from afternoon. Light winds tend south to southwest in the afternoon.
Highs: 13-15

Morning rain then easing, brisk to strong southerly winds.
High: 11

Marlborough & Nelson
Early rain clears then mostly cloudy and dry (some afternoon sun possible for Nelson), a few showers or drizzle patches still possible south of the Wairau Valley however. South to southeasterly winds.
Highs: 13-15

Areas of drizzle, some rain at times from midday. Snow to 500m may lower to 400m overnight. Fresh south to southwesterly winds.
Highs: 7-10

West Coast
High cloud, some sun at times. Southeasterly winds.
Highs: 14-15

Southland & Otago
Cloudy with some drizzle, drier spells developing from afternoon. There may be a light snow flurry or two lowering to 300m late afternoon in the east, any flurries shouldn't cause any issues. East to southeasterly winds.
Highs: 8-10

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on August 31, 2017 at 4:28 PM

Two lows, two islands, two airflows

Posted by WW Forecast Team on Thu, 31/08/2017 - 11:06

The complicated and messy forecast for many parts of New Zealand continues as two low pressure systems produce two different weather set ups for the country.

In the South Island a low out east near the Chatham Islands will move closer to Canterbury and eastern areas of the Mainland on Friday. This will produce showers, drizzle, low cloud and some patchy rain (especially inland and north). This low to the east will push a southerly flow into the South Island and it will become colder.

Dunedin has a high of 9 tomorrow and Christchurch has a high of only 8 by Saturday. Wellington has highs of 11 tomorrow and through the weekend due to this cooler airflow, on the edge of the South Island's cooler weather.

This means snow showers are possible down to a few hundred metres on the eastern South Island ranges next day or two - but not huge amounts.

However in the North Island is warmer thanks to the other low pressure system out in the Tasman Sea. This low will continue to encourage a much warmer NW airflow for northerners. Main centres like Auckland, Hamilton, Tauranga and Whangarei are likely to reach the late teens with sub-tropical light nor'westers over the next day or two.

As this Tasman Sea low moves in over Saturday and the weekend there will be a mix of downpours, patchy rain, drizzle and dry. Large dry areas will extend further on Sunday over the North Island too - but so too will a cooler change from the South Island as this low crosses the North Island during Sunday.


Posted on August 31, 2017 at 1:39 AM

Thursday's national forecast

Posted by WW Forecast Team on Thu, 31/08/2017 - 04:00

A southeasterly airflow picks up over the South Island and lower North Island today while low pressure hangs over the upper North Island.

Northland, Auckland, Waikato & Bay Of Plenty
A risk of morning fog then sunny spells, isolated showers possible especially in the afternoon. Areas of fog may form again overnight. Light winds.
Highs: 16-18

Western North Island (including Central North Island)
Showers, becoming drier in the evening. Parts of Taranaki (more so in the north) may be fairly dry in the morning. Southeasterly winds.
Highs: 12-16

Eastern North Island
Rain about the Wairarapa, drier further north however showers develop in the afternoon then clearing in the evening. Southwesterlies ease later in the day.
Highs: 15-16

Patchy rain or drizzle, fresh southerly winds.
High: 12

Marlborough & Nelson
Morning rain then dry spells increasing from afternoon. Southeasterly winds.
Highs: 14-16

Drizzle then some rain at times from afternoon, southerlies freshen.
Highs: 9-11

West Coast
High cloud, areas of mid level cloud about Buller. Southeasterly winds.
Highs: 16-17

Southland & Otago
Mostly cloudy, risk of a drizzle patch or two. Coastal Otago has a higher risk of drizzle. East to southeasterly winds
Highs: 10-12

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on August 31, 2017 at 1:30 AM

Wednesday's national forecast

Posted by WW Forecast Team on Wed, 30/08/2017 - 04:00
A fairly slack pressure gradient today (not much wind flow) however a front moves southwards over the upper North Island during the day.

Northland, Auckland, Waikato & Bay Of Plenty
Rain in the morning (possibly heavy) about Northland and Auckland then moving into the Waikato and Bay Of Plenty during the afternoon, easing in the north from afternoon and further south in the evening. There may be some morning fog about the Waikato. Light winds.
Highs: 15-17

Western North Island (including Central North Island)
Sunny areas and increasing high cloud after any morning fog breaks, showers developing from afternoon then some overnight rain. Light winds.
Highs: 14-17

Eastern North Island
Sunny areas and increasing cloud, patchy rain / showers develop in the evening. Light easterlies.
Highs: 15-17

Mostly cloudy with Southerlies gradually freshening, overnight drizzle.
High: 14

Marlborough & Nelson
Becoming mostly cloudy in the morning, light winds.
Highs: 13-14

Mostly cloudy, there may be a drizzle patch or two otherwise mainly dry. Light easterlies.
Highs: 10-12

West Coast
Mostly sunny with some high cloud, lower level cloud increases in the evening about Buller. Light winds.
Highs: 14-16

Southland & Otago
Mostly sunny about Southland and Central Otago, some high cloud from afternoon. Coastal Otago sees mostly cloudy skies, some sun may break through at times. Light winds.
Highs: 12-14

By Weather Analyst Aaron Wilkinson - WeatherWatch.co.nz

Posted on August 30, 2017 at 3:45 AM

Northern downpours continue Wednesday, central downpours Thursday

Heavy downpours have swept down the upper North Island today and continue as we head through this afternoon.

The main band of rain is tracking into eastern Bay of Plenty now and into Central Plateau with isolated heavy falls.

It's dry in Auckland now after a very wet morning with ponding/surface water on highways and a very slow commute. Hopefully peak traffic this evening will move faster than this morning under sunnier skies - although isolated downpours are possible (35% chance) in Auckland late this afternoon or evening.

Speaking of downpours - isolated heavy showers are again crossing parts of Northland this afternoon, these are the ones that may drift towards Auckland later. 

On Thursday the bulk of the wet weather swings around to eastern areas of central New Zealand, especially the lower North Island and the Kaikoura area in the South Island.
Isolated showers will be elsewhere in the North Island on Thursday with driest weather expected in Southland and the West Coast.


Posted on August 30, 2017 at 3:37 AM

Special Video: Tropical Storm Harvey to make second landfall soon

Tropical Storm Harvey has become the a historic wet event with 1245mm of rain falling in some parts of Texas, more than their annual rainfall in just a few days.

In perspective Auckland has 1115mm of rain annual and Christchurch around 650mm.

The storm is making second landfall today - on the same day that Katrina made landfall in New Orleans 12 years ago.

There is some good news - the wettest weather is now shifting out of Texas and the low itself will speed up in the days ahead and move away - allowing for airports to open and direct flights from Auckland to Houston to resume in time.

In fact in the past hour we've had reports of the sun coming out in Houston - great news!


Posted on August 30, 2017 at 2:11 AM

Re: Yesterday's Summary for Friday - Date : 01/01/2016

Yesterday's Summary for Ohauiti Weather - Date : 01/01/2016

Temperature and Humidity
High Temperature 19.5 °C at 10:02
Low Temperature 15.8 °C at 18:45
Temperature Range 3.7 °C
High Apparent Temperature 18.6 °C at 22:34
Low Apparent Temperature 12.7 °C at 18:00
Low Wind Chill 15.0 °C at 19:05
High Heat Index 19.5 °C at 10:02
High Humidity 99 % at 21:04
Low Humidity 41 % at 10:07

Rainfall Yesterday 0.0 mm
Rainfall Rate Max 0.0 mm/hr at 00:00
High Hourly Rainfall 0.0 mm at 00:00

Highest Gust 39 km/h at 10:08
Highest Speed (10 minute average) 23 km/h (F4) at 10:07
Wind Run 207.4 km
Dominant Direction 59° ENE

High Pressure (SL) 1016.4 hPa at 09:32
Low Pressure (SL) 1012.8 hPa at 23:58

Page updated 2/01/2016 15:40:00
powered by Cumulus v1.9.4 (1099)
View more local weather information at http://www.ohauitiweather.co.nz...
Weather Data (c) Copyright 2016 Ohauiti Weather

Posted on January 02, 2016 at 3:46 PM


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Wednesday's national forecast

Posted by WW Forecast Team on Wed, 28/11/2018 - 03:33

A large low is centred just to the northeast of the North Island today. This low pushes in a southeasterly airflow over most of New Zealand, tending southwest Waikato northwards.

Northland, Auck…

Posted on November 28, 2018 at 8:08 PM


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Joined: February 27, 2012

Tuesday's national forecast

Posted by WW Forecast Team on Tue, 27/11/2018 - 04:00

A large broad low rotates onto the North Island today from the Tasman Sea, further unsettled weather likely today for both Islands.

Northland, Auckland, Waikato & Bay Of Plenty
Sunny areas and …

Posted on November 27, 2018 at 3:32 PM


Total Posts: 494
Joined: February 27, 2012

Monday's National Forecast

Posted by WW Forecast Team on Mon, 26/11/2018 - 04:00

A low pressure system fires an easterly quarter airflow over the South Island today meanwhile most of the North Island has northwesterlies. Unsettled weather for the majority to follow.

North Is…

Posted on November 26, 2018 at 11:28 AM