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Tired of The Weather? Talk To The
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West Craven Highlights, April 19, 1984, Page 7
By Donald J. Frederick
National Geographic News Service
WASHINGTON Hero or villain? Jet streams
can play either role, depending on where you are
and what king of weather you prefer.
The invisible ribbons of wind that course
through space get applause for bringing relief
from sweltering heat or bitter cold, hisses for
helping apawn spring tornadoes or raging
winter blizzards. Air line passengers sometimes
feel their wrath in a bumpy ride, their blessing in
an early arrival.
Jet streams are components of the global wind
lystem which labors endlessly to send excess heat
from the equator toward the poles and cold polar
air back down toward the tropics.
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Air Belts Converge
Most of the air does not flow a nonstop route.
Warm air traveling toward the poles goes only
about a third of the way; then it cools, sinks, and
travels back toward the tropics, where it's known
as the trade winds. Similarly, most of the polar
air moving toward the equator grows warmer a
third of the way down and begins to rise and flow
back toward the poles.
The differences in temperature between these
two belts of air cause a third one to form over the
Earth's mid-latitudes. The planet's rotation,
reaching speeds of about 1,1000 mph at the
equator, makes this wind blow toward the east.
Sweeping the United States and Canada from
west to east coast, the winds are known as the
westerlies, and their high speed cores of air are
the jet streams.
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