WINDS
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| WIND STORM |
Winds blow from areas of high atmospheric pressure to those of low pressure.There is low pressure about the equator and at the Arctic and Antarctic circles and high pressure near the tropics.
Winds is likewise a significant methods for transportation for seeds and little flying creatures; with time things can travel a large number of miles in the breeze. In meteorology, winds are frequently alluded to as per their quality, and the heading from which the breeze is blowing. Short blasts of fast wind are named blasts.
TYPES OF WINDS
There are 3 types of winds they are
(a) Regular Winds Also known as Prevailing winds and Planetory winds. e.g., Trade winds, Westerlies, Polar Easterlies.
(b) Periodical Winds These are the winds which blow seasonally. e.g., Monsoons.
(c) Variable Winds Cyclones and other local winds are known as variable winds.
TRADE WINDS
These are steady currents of air blowing towards equatorial low pressure from North Eastern and South Eastern subtropical high pressure area 300 N and 300 S.Trade in German means 'Track'. To blow 'trade' means 'to blow steady in the some direction'.
WESTERLIES
It blows from subtropical high pressure to sub-polar low pressure belt between 300 and 600, on either side of Equator.
It is also known as 'Roaring Forties or Furious Fifties and Shrieking Sixties in the Southern hemisphere as they gather force in the absence of any land mass.
POLAR EASTERLIES
It moves from high pressure to sub-polar low pressure areas.
These are deflected by the Earth's rotation to become East winds or Polar Easterlies.
MONSOONS
It blows over and above the Indian ocean
They may be regarded as land and sea breezes on a much larger scale changing not with day and night but with the season.
In winter monsoon blow from the vast Asiatic landmass towards the Indian ocean,while in their direction reverses itself.
Summer monsoons account foremost of rainfall in our country.
They blow from the sea to land in summer and in winter it blows from land to sea.
LOCAL
WINDS
Bora
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Cold, dry winds blowing outwards from Hungary to the North of Italy
(Near Adriatic Sea).
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Blizzard
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Very cold winds in
Tundra region.
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Brick fielder
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Hot, wind in
Australia.
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Chinook
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Hot, dry wind in
Rockets also called snow eater.
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Foehn
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Hot, dry wind in the
Alps.
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Haboob
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It blows in Mid-day
in May and September over North and North-East Sudan with thunderstorm that
why visibility is very low here sometime it make rain heavily.
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Khamsin
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Hot, dry wind in
Egypt.
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Levanter
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Very cold wind in
Spain.
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Mistral
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Very cold wind,
which blows low from the Alps over France.
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Kalbaisakhi
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Warm, North India
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Berg
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Warm South Africa
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Zonda
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Warm Andes
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Harmattan (Doctor)
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Warm Guiena Coast.
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Norwester
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Hot wind in New
Zealand.
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Punas
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Cold, dry wind
blowing down towards the Western side of Andes.
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Santa Ana
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Hot wind in South
California.
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Sirocco
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Hot, moist wind from
Sahara to Mediterranean sea.
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Solana
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Hot, moist wind from
Sahara towards Siberian Peninsula.
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JET-STREAM
The jet-stream is a system of upper-air westerlies. It gives rise to slowly moving upper-air waves.In the upper-air waves are some narrow zones in which wind velocities up to 250 knots are observed in some air streams.This phenomenon is called the jet-Stream.They develop just below the tropopause over areas of very steep pressure gradient on the surface.
LAND AND SEA BREEZES
Land gets heated sooner than water and it also cools down sooner.
Thus, during day time land is hotter than sea while at night the reverse is the case.
Heat lowers pressure.Winds thus blow from sea to land during the day and from land to sea during the night.
These are respectively known as the sea breeze and the land breeze.
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