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May 042015
Fairweather  cumulus clouds show cross country glider pilots where the air is going up. These clouds sit on top of a column of rising air.  Cloudbase rises over a day until the clouds disapate. Good pilots can select growing clouds and head to them. They then slow down from around 150 km/hr to  90 km/hr and turn at 45 degrees to thermal.
 Posted by at 3:40 pm

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