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Anticyclone pressure Anticyclone pressure systemssystems

A Brief By Lance A Brief By Lance GrindleyGrindley

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CycloneCyclone► characterized by rapid characterized by rapid

inward circulation of inward circulation of air masses about a air masses about a low-pressure center, low-pressure center,

► accompanied by accompanied by stormy, destructive stormy, destructive weather. weather.

► counterclockwise in counterclockwise in the Northern the Northern Hemisphere and Hemisphere and clockwise in the clockwise in the Southern Hemisphere. Southern Hemisphere.

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AnticycloneAnticyclone

► A region of relatively A region of relatively high high atmospheric pressureatmospheric pressure

► thousands of thousands of kilometers in diameter.kilometers in diameter.

► appear on weather appear on weather charts as a series of charts as a series of concentric, widely concentric, widely spaced isobars of 1000 spaced isobars of 1000 mbs and above. mbs and above.

► clockwise in the clockwise in the Northern Northern Hemisphere, and Hemisphere, and

► anticlockwise in the anticlockwise in the SouthernSouthern

► also known as a also known as a high.high.

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NORTHERN HEMISPHERE

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Weather in AnticyclonesWeather in Anticyclones

►Varies from place to placeVaries from place to place

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Weather in Weather in Cold anticyclonesCold anticyclones

► also known as also known as continental highscontinental highs

► Siberia and north-Siberia and north-west Canada in west Canada in winterwinter

► Cool airCool air

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Weather in Subtropical Weather in Subtropical anticyclonesanticyclones

► stable atmospheric stable atmospheric conditions, and conditions, and thus, thus,

► fine, fine, ► hot,hot,► dry weather.dry weather.

► Strongest at Strongest at 32° N and S. 32° N and S.

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WeatherWeathermid-latitudemid-latitude anticyclones anticyclones

► located beneath the located beneath the leading edge of leading edge of ridges in the upper-ridges in the upper-air westerliesair westerlies

► the weather is the weather is unusually fineunusually fine

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Winter anticyclonesWinter anticyclones

►may bring cold, may bring cold, ► frosty weather, frosty weather, ► or fog. or fog.

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