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| UPPER LEVEL DISTURBANCE |
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| Often, upper level
disturbances ride along the high altitude winds
far above the earth's surface. They are not associated with any
surface storms
and sometimes
they are not even mentioned in weather forecasts. These disturbances
very often spawn the unexpected shower that ruins a family picnic.
As you can see in the graphic above, the disturbance's vertical
circulation causes rising vertical motion ahead of the disturbance.
This can lead to clouds and precipitation. Skies rapidly clear
behind the disturbance because of the sinking air, which inhibits
clouds and precipitation. Usually, upper level disturbances do
not produce widespread or long lasting precipitation. They can,
however, trigger thunderstorms and severe weather during spring
and summer. |
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