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Last modified
7/28/2009 2:40:06 PM
Creation date
4/23/2008 1:57:02 PM
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Weather Modification
Title
The Characteristics and Evolution of Supercooled Water in Wintertime Storms Over the Sierra Nevada: A Summary of Radiometric Measurements taken During the Sierra Navada Cooperative Pilot Project
Date
7/1/1987
Weather Modification - Doc Type
Report
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<br />The satellite picture and 500 mb height and temperature contours shown in <br />Fig. 16 depict the storm flow and cloud cover as the storm was about to impact <br />the study.area. .A time ~ection of.the storm. is shown on Fig. 17. Radiometer <br /> <br />. . <br />liquid water and the precipitation data set~ are shown in Fig. 18. <br /> <br />Winds observed near the onset of the storm were northerly to northwesterly <br /> <br />above 2 km. As the system approached, winds shifted to a more westerly direc- <br /> <br />tion, which favored orographic lift. Supercooled water typically measured <br />0.20 mm to as high as 0~70 mm during this period. The pre-frontal liquid water <br />lasted about 5 hours. There was no precipitation recorded during this time. <br /> <br />The front shown in Fig. 17 was confined to the upper levels (> 3 km). The <br />front preceded the trough by 3 hours. The frontal band passed through the pro- <br />ject area between 0000 and 0300. Precipitation started with the passage of the <br /> <br />cold front and ended with the passage of the trough. Precipitation varied from <br />0.2 to 0.4 mmh-1 in the precipitat'ion band associated with the front. Super- <br />cooled water was typically 0.05 mm with peaks from 0.20 to 0.40 mm in convection <br />during the frontal passage. <br /> <br />or <br /> <br />The associated trough passed between 0300 and 0600, as evidenced by the dip <br />in the isotherms on time-height section. Both precipitation and supercooled <br />water dissipated as wind shifted in response to the passing trough. Winds <br />shifted to become northeast below 2 km, and generally out of the north above <br />this altitude. The storm was through the project area in about 13 hours which <br />indicates the extent and the speed of the storm. <br /> <br />Discussion <br /> <br />This group represents the coldest and fastest moving storms of the total popula- <br />tion. Eleven out of 63 storms were grouped in this category. Seven out of <br /> <br />23 <br /> <br />. .-! <br />
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