The Western Hemisphere Warm Pool (WHWP) is a region of sea surface temperatures (SST) warmer than 28.5°C that develops west of Central America in the spring, then expands to the tropical waters to the east.
WHWP development ...
Hemisphere Half of the Earth, usually conceived as resulting from the division of the globe into two equal parts, north and south or east and west.
In our hemisphere they are referred to as hurricanes, named by the Caribbean Indians for Huracan, a Caribbean God of Evil.
Northern Hemisphere: the half of the earth located above the equator, from 0° to the North Pole.
The Southern Hemisphere low latitudes are considered to be the areas of the earth south of the equator and north of about 30 degrees latitude.
The Southern Hemisphere also experiences tropical cyclones. However, they are confined to the Western Pacific and Indian Oceans. Even though ocean temperatures are warm enough, a small region without tropical cyclones exists near the equator.
CycloneAn area of low pressure around which winds blow counterclockwise in the Northern Hemisphere. Also the term used for a hurricane in the Indian Ocean and in the Western Pacific Ocean.
For example, in the Northern Hemisphere, winter is said to begin on the winter solstice and end on the vernal equinox when spring begins, covering the months of December, January, and February.
When these products break down they destroy stratospheric ozone, creating the Antarctic Ozone Hole in the Southern Hemisphere spring (Northern Hemisphere autumn).
AnticycloneA large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere, ...
It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.
4 and 4 µm, is being transferred across an area of a surface (real or imaginary) in a hemisphere of directions.shortwave net radiationThe difference between upwelling and downwelling broadband shortwave radiation.
The magnitudes of some volcanic eruptions in the Northern Hemisphere have been estimated from the acidity of annual layers in ice cores taken in Greenland. This methodology is sometimes referred to as acidity signal or acidity record.
In the Northern Hemisphere, winter customarily includes the months of December, January and February.Winter PoolThe pool, or height of the water surface, of a reservoir during the winter.
The earliest known classification of climate, devised by the Greeks, simply divided each hemisphere into a mathematical climate of three zones, the "summerless," "intermediate," and "winterless, ...
The Polar Front Jet: As its name implies, this jet stream is associated with the marked discontinuity found at the boundary of well defined air masses - polar to the north/sub tropical to the south (in the northern hemisphere), ...
The acronym stands for Australian Surface Pressure Bogus Data for the Southern Hemisphere).
Hurricanes occur along the western boundaries of the Atlantic and Pacific oceans, in both northern and southern hemispheres, except for the South Atlantic, which has no hurricanes.
In the northern hemisphere that is generally from the NE, while in the southern hemispere the trade winds blow from the SE. The trade winds are present over all the oceans except the Indian Ocean, north of the equator.
Prolonged blocking in the Northern Hemisphere occurs most frequently in the spring over the eastern North Atlantic and eastern North Pacific regions. Compare blocking high. 2.
The air flowing around a hurricane spins counter-clockwise in the northern hemisphere, and clockwise in the southern hemisphere (as does the earth, itself). In both hemispheres, this rotation is called cyclonic.
In the Northern Hemisphere the air rapidly circulates counterclockwise and in the Southern Hemisphere clockwise.
as viewed from above, the circulation is counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere, undefined at the Equator.
Above 24,000 feet, the AWC provides warnings of dangerous wind shear, thunderstorms, turbulence, icing and volcanic ash for the Northern Hemisphere from the middle of the Pacific Ocean eastward to the middle of the Atlantic Ocean.
Summer Solstice: The date on which the sun reaches the greatest distance north (in the Northern Hemisphere) or south (in the Southern Hemisphere) of the celestial equator.
In the Northern Hemisphere winds are deflected to the right, and in the Southern Hemisphere to the left.
It is strongest during a Northern Hemisphere winter and early spring, centered over Iceland and southern Greenland, and is the dominate weather feature in the area.
Solstice The point in time when the vertical rays of the Sun are striking either the Tropic of Cancer (summer solstice in the Northern Hemisphere) or the Tropic of Capricorn (winter solstice in the Northern Hemisphere).
A counterclockwise shift in the wind direction in the Northern Hemisphere at a certain location. In the Southern Hemisphere, it is clockwise. This can either happen in the horizontal or the vertical (with height).
It is seen as a bright display of constantly changing light near the magnetic poles of each hemisphere.
The first is global models, which focus on the entire northern hemisphere. The second is national models, which focus on the USA. The third is regional models.
It is characterized as having the coldest temperatures of the year, when the sun is primarily over the opposite hemisphere.
Autumnal Equinox - The equinox at which the sun approaches the Southern Hemispheres, marking the start of astronomical autumn in the Northern Hemisphere. The time of this occurrence is approximately 22 September.
A large scale atmospheric circulation system in which the winds rotate anti clockwise in the Southern Hemisphere (clockwise in Northern Hemisphere).
The equinox at which the sun approaches the Southern Hemisphere, marking the start of astronomical autumn in the Northern Hemisphere. The time of this occurrence is approximately September 22. On that day, daylight is everywhere 12 hours.
Solstice: Either of the two times per year when the sun is at its greatest angular distance from the celestial equator: about June 21 (the Northern Hemisphere summer solstice), when the sun reaches its northernmost point on the celestial sphere, ...
In the Northern Hemisphere, this "belt" consists of the Aleutian low in the North Pacific and the Icelandic low in the North Atlantic. In the Southern Hemisphere, it exists around the periphery of the Antarctic continent.
An area of a relative pressure minimum that has converging winds and rotates in the same direction as the earth. This is counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
The apparent force due to the rotating Earth which deflects winds to the right in the northern hemisphere and to the left in the southern hemisphere.
Cumuliform Cloud
cloud that forms by convection. Typically a heap cloud such as cumulus.
Coriolis Effect-The way Earth's rotation make winds in the Northern Hemisphere curve to the right and winds in the Southern Hemisphere curve to the left.
Cyclone-A swirling center of low air pressure.
Generally, there are no more than about five longwave troughs around the Northern Hemisphere at any given time. Their position and intensity govern general weather patterns (e.g., hot/cold, wet/dry) over periods of days, weeks, or months.
HIGH: An area of high pressure around which the wind blows clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.
HUMIDITY: Generally the measure of the water vapor content of the air.
Hurricane- A tropical cyclone in the western hemisphere that has sustained wind speeds of 74 miles per hour or greater.
Hydrosphere- The Earth's water.
Hygrometer- An instrument that measures the water vapor content of the air.
Buys Ballot's Law - With your back to the wind in the Northern Hemisphere, low pressure will be to your left and high pressure to your right. The reverse is true in the Southern Hemisphere.
Anticyclone - An area of high pressure. Winds blow in a clockwise direction in the Northern Hemisphere and in a counter clockwise direction in the Southern Hemisphere. Fair weather is associated with an anticyclone.
Intertropical convergence zone (ITCZ) The boundary zone separating the northeast trade winds of the Northern Hemisphere from the southeast trade winds of the Southern Hemisphere.
Inversion An increase in air temperature with height.
CYCLONE - A rotating region of low atmospheric pressure. In the northern hemisphere, cyclones rotate counter-clockwise. They rotate clockwise in the southern hemisphere. The word has Greek origins.
Aurora Borealis
(Northern Lights) Aurora of the Northern Hemisphere.
Avalanche
Mass of snow and ice falling suddenly down a mountain slope and often taking with it earth, rocks, and rubble of every description.
cyclone- a rotating mass of air with minimum pressure in its center. In the Northern Hemisphere, such winds move counterclockwise, and in the Southern Hemisphere, clockwise.
CORIOLIS FORCE: An apparent force caused by the rotation of the Earth. In the Northern Hemisphere winds are deflected to the right, and in the Southern Hemisphere to the left.
Cyclone - Circular wind pattern around a centre of low pressure. Clockwise in Southern Hemisphere and counter clockwise in the Northern Hemisphere, when viewed from above.
anticyclone: high pressure area with counterclockwise winds in the Southern Hemisphere and clockwise winds in the Northern Hemisphere.
Trade Winds: Winds that divert from the subtropical high-pressure belts towards the intertropical convergence zone. They blow northeasterly in the Northern Hemisphere and southeasterly in the Southern Hemisphere.
Cyclone
An atmospheric closed circulation rotating counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
Coriolis Effect-The deflective effect of the earth's rotation on all free-moving objects, including the atmosphere and oceans. To the right in the northern hemisphere and left in the southern hemisphere.
Rotation in the opposite sense from Earth's rotation, i.e. clockwise in the Northern Hemisphere as seen from above. The opposite of cyclonic rotation.
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Coriolis force A deflective force arising from the rotation of the Earth on its axis; affects principally synoptic-scale and planetary-scale winds. Winds are deflected to the right of their initial direction in the Northern Hemisphere and to the ...
Trade Winds- easterly-blowing winds that are found on either side of the equator and blow northeasterly in the Northern Hemisphere and southeasterly in the Southern Hemisphere.
Equator - The imaginary great circle of 0 degrees latitude on the Earth's surface, separating the Northern Hemisphere from the Southern Hemisphere.
Anticyclonic - Rotation opposite the earth's rotational sense. In the Northern Hemisphere, clockwise rotation is anticyclonic. Wind in a ridge or around a high; supergeostrophic.
 See also: Norther, Air, Pressure, Weather, Surface
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