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Water Vapor Image - 02/16/2003 at 930 PM MST.

The water vapor image above (taken at 930 PM MST on February 16, 2003) shows moisture content at approximately 30,000 feet above sea level.  Light colors indicate higher levels of moisture, and darker colors show drier air.  The ( L ) over north central Wyoming is the center of an upper level circulation or low pressure center after it crossed the Continental Divide.  The blue arrow shows darker coloration indicating very dry air east of the Wind River Mountains over Lander.   This localized area of very dry air indicates that the dry, heavier air from the stratosphere is being pulled down into the lower levels of the atmosphere.  The yellow arrow shows the position of the main jet stream where the strongest upper level winds are occurring.    
 
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