High latitudes
The latitude belt roughly between 60° and 90° North and South.
High pressure system ...
High Latitudes
With specific reference to zones of geomagnetic activity, "high latitudes" refers to 50?Ǭ? to 80?Ǭ? geomagnetic.
High Risk (of severe thunderstorms) ...
Also known as the southern lights; the luminous, radiant emission from the upper atmosphere over middle and high latitudes, and centred around the earth's magnetic poles.
It occurs at very low temperatures, and usually in clear, calm weather in high latitudes. The sun is usually visible and may cause halo phenomena.
At mid to high latitudes in the upper part of the troposphere (above roughly 5 km ), the mean wind flow exhibits a broadly west-to-east motion - this applies in both hemispheres.
A blocking situation is attended by pronounced meridional flow in the upper levels, often comprising one or more closed anticyclonic circulations at high latitudes and cyclonic circulations at low latitudes (cut-off highs and cut-off lows).
noctilucent clouds"(Rarely called luminous clouds.) Thin silvery-blue cirrus-like clouds frequently seen during summer twilight conditions at high latitudes (above 50°) in both hemispheres.
polar air—An air mass with characteristics developed over high latitudes, especially within the subpolar highs.
BLOCKING HIGH The development of a warm ridge or cutoff high aloft at high latitudes which becomes associated with a cold high at the surface, causing a split in the westerly winds.
Continental Polar air forms over the high latitudes of North America, Europe and Asia. This air mass has low surface temperatures, is very stable, with low moisture.
Similar storms may appear, at times, at very high latitudes. The very cold storms are called subarctic cyclones or low-pressure cells in the Northern Hemisphere and subantarctic cyclones or low-pressure cells in the Southern Hemisphere.
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AURORA It is created by the radiant energy emission from the sun and its interaction with the earth's upper atmosphere over the middle and high latitudes.
Polar Air: Mass of air originating in high latitudes that is colder and moves towards the equator. The air masses originating in the Artic and Antarctic receive the names of their regions.
Aurora Luminous phenomena, in the form of arcs, bands, draperies, or curtains in the high atmosphere over high latitudes. Auroras are related to magnetic storms and the influx of charged particles from the Sun.
aurora: appears as greenish-white and sometimes pink light in the night sky over the middle and high latitudes. Called the aurora borealis in the Northern Hemisphere and the aurora australis in the Southern Hemisphere.
Extratropical Cyclone - a cyclone in the middle and high latitudes often being 2000 kilometers in diameter and usually containing a cold front that extends toward the equator for hundreds of kilometers ...
Poleward heat transport Flow of heat from tropical to middle and high latitudes in response to latitudinal imbalances in radiational heating and cooling.
Ground based and satellite measurements show significant decreases in total column ozone in the middle to high latitudes of both hemispheres. The downward trends were larger in the 1980s than in the 1970s, and larger in the 1990s than the 1980s.
Polar Air
Mass of air which has laid over high latitudes for several days and which, therefore, has become fairly cold, at least in the lower levels.
COLD CORE HIGH- A dome of cold surface high pressure that originates from the high latitudes. ...
Taiga "Taiga" is a Russian word (pronounced "ti-ga") used to refer to the Boreal woodlands or open forest which lies just south of the tundra in high latitudes. It consists of coniferous trees growing in cold and swampy soils occupied by lichens.
There are two main types of glacier: mountain glaciers which form at altitude among mountain peaks and valleys; and continental glaciers, which form over continents at high latitude. Glaciers formed over much of the high latitudes of continents ...
activity generated in Gottingen, Germany, based on the K Index from 12 or 13 stations distributed around the world
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: A Index, Aurora, Auroral Oval, High Latitudes, ...
NORTH ATLANTIC DRIFT - The termination point of the Gulf Stream current in the North Atlantic Ocean off the British and Irish countries in Europe. This warm current is responsible for Western Europe's warm climate despite the high latitudes (50 ...
The Bergeron process competes with growth and coalescence of droplets in clouds above 0°C, which can create drizzle in nimbostratus, and rain in tropical convective storms. In middle and high latitudes, ...
modifications and variations due to the migratory cyclones and anticyclones of middle latitudes, causing rapid and often violent weather changes, as warm semi-tropical air from the horse latitudes meets cold polar air from the high latitudes.
It is found at high latitudes (arctic tundra) and high altitudes (alpine tundra). Arctic tundra is underlain by permafrost and usually very wet.
Northern LightsCommon name for Aurora Borealis; the luminous, radiant emission from the upper atmosphere over middle and high latitudes, and centred around the earth's magnetic poles.
Low latitudes rotate at a faster angular rate (approx. 14 degrees per day) than do high latitudes (approx. 12 degrees per day).
 See also: Latitude, High, Water, Air, Temperature
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