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<br />TOTAL AVAILABLE WATER VAPOR <br /> <br />The measure of total water vapor content of the atmosphere <br />through a vertical column over a measuring station is <br />called precipitable water. It is measured in inches of <br />water available if all water vapor is condensed to liquid <br />water. The figure shows the normal atmospheric content <br />of water vapor for July in inches. <br /> <br />oOnly about lOt of the atmospheric water vapor passing across <br />South Dakota in the air masses is gathered by clouds and <br />released as rainfall on the ground. The water vapor is <br />replenished through evaporation of soil moisture and by <br />moist air originating over oceans. <br /> <br />NORMAL PRECIPITABLE WATER FOR JULY <br />(inches) <br /> <br /> <br />""" <br />; \ <br /> <br />28 <br />