{"id":107,"date":"2023-05-18T21:46:23","date_gmt":"2023-05-18T09:46:23","guid":{"rendered":"https:\/\/communityweather.org.nz\/?page_id=107"},"modified":"2023-05-18T22:34:19","modified_gmt":"2023-05-18T10:34:19","slug":"weather-glossary-h","status":"publish","type":"page","link":"https:\/\/communityweather.org.nz\/?page_id=107","title":{"rendered":"Weather Glossary \u2013 H"},"content":{"rendered":"\t\t
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H<\/span><\/strong><\/p>

HAIL\u00a0<\/strong>– Precipitation of small balls or other pieces of ice (hailstones) falling separately or frozen together in irregular lumps. (Typically associated with thunderstorms and surface temperatures above freezing).<\/span><\/p>

HALOS<\/strong>\u00a0– Rings or arcs that seem to encircle the sun or moon. They are caused by the refraction of light through the ice crystals in cirrus clouds.<\/span><\/p>

HARD\u00a0<\/b>FREEZE<\/strong>\u00a0– freeze where vegetation is killed and the ground surface is frozen solid.<\/span><\/p>

HAZE-<\/strong>\u00a0Fine dry or wet dust or salt particles in the air that reduce visibility.<\/span><\/p>

HEAVY SNOW\u00a0<\/strong>– In the Inland Northwest, mountains above 3000 feet – 8 to 12 inches in 12 hours or 12-18 inches or more in 24 hours. For the valleys and Basin below 3000 feet – 4 inches in 12 hours and 6 inches in 24 hours.<\/span><\/p>

HEAT INDEX<\/strong>\u00a0– The HI is the temperature the body feels when the heat and humidity are combined.<\/span><\/p>

HEAT LOW<\/strong>\u00a0– The thermal induced surface low pressure trough that develops during the warm season in the lee of the Cascades.<\/span><\/p>

HELICITY<\/strong>– Streamwise vorticity available for ingestion into a thunderstorm. Higher values are favorable for a rotating updraft (greater than 400). A measure of low level wind shear, normally within the lowest 3 km of the atmosphere, relative to the movement of a thunderstorm (thus referred to as 0-3 km Storm Relative Helicity). This gives forecasters an indication of an environment that is favorable for supporting the development of thunderstorms with rotating updrafts, a precursor to supercell thunderstorms (the most violent of severe storms) and tornado development. Values of helicity greater than +150 are considered significant; however, like CAPE values, there is no magic value of (positive) helicity under which rotating thunderstorms will not develop. Helicity is only an index to determining thunderstorm rotation potential.\u00a0<\/span><\/p>

HIC<\/strong>\u00a0– Hydrologist In Charge.<\/span><\/p>

HIGH<\/strong>\u00a0– The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.<\/span><\/p>

HIGH WINDS<\/strong>\u00a0– Winds of 40 mph or greater lasting for an hour or more , and\/or gusts to 58 mph or greater.<\/span><\/p>

HORIZONTAL\u00a0<\/b>VORTICITY<\/strong>–<\/b>\u00a0A rotation of air caused by vertical speed or directional wind shear.<\/span><\/p>

HORSE\u00a0<\/b>LATITUDES<\/strong>\u00a0<\/b>– subtropical regions where anticyclones produce settled weather.<\/span><\/p>

HUMIDITY<\/strong>\u00a0-The amount of water vapor in the atmosphere. (See relative humidity).<\/span><\/p>

HURRICANE<\/strong>\u00a0– A severe tropical cyclone with wind speeds in excess of 74 mph (64 knots).<\/span><\/p>

HYDROLOGIC\u00a0<\/b>CYCLE<\/strong>\u00a0– the composite picture of the interchange of water substance between the earth, the atmosphere and the seas which includes the change of state and vertical and horizontal transport.<\/span><\/p>

HYGROMETER<\/strong>\u00a0– an instrument used to measure humidity.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

H HAIL\u00a0– Precipitation of small balls or other pieces of ice (hailstones) falling separately or frozen together in irregular lumps. (Typically associated with thunderstorms and surface...<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":48,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-107","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/107","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=107"}],"version-history":[{"count":4,"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/107\/revisions"}],"predecessor-version":[{"id":227,"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/107\/revisions\/227"}],"up":[{"embeddable":true,"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/48"}],"wp:attachment":[{"href":"https:\/\/communityweather.org.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}