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<br />in the orographic cloud system which r~mained after the onset of upper tropo- <br />spheric subsidence associated with the passage of the upper level jet. This <br /> <br />event occ~rred 0-4 hours ~efore the surface frontal passage. In all three <br /> <br />. . . <br />.. ..-. . .". . ., <br />storms, increases in supercool~d ~aier, ~~~ilar to. the 26-29 March case, were <br /> <br />observed. The duration of supercooled water events varied from 24-45 hours. <br /> <br />Sustained supercooled water (0.30-0.,60 mm) was typically present for 7-10 hours <br /> <br />with peaks to 1.10 mm. In all cases, the radiometer trace was suggestive of <br />embedded convection. The second region where supercooled water was observed was <br />during the passage of the warm front. In general, supercooled water measure- <br /> <br />ments varied between 0.05 and 0.15 mm during warm frontal passage. The super- <br /> <br />cooled water measurements were generally steady, suggesting that the water was <br /> <br />produced by more uniform lifting, rcither than convection. More substantial <br /> <br />supercooled water measurements (0.40-0.60 mm) were recorded for a period of six <br /> <br />hours in one case (7-10 February 1985). A third region where supercooled water <br /> <br />was sometimes observed was near the end of the storm as isolated convective <br /> <br />cells moved over the radiometer site. These cells frequently produced isolated <br /> <br />peaks to 0.50 mm. <br /> <br />or <br /> <br />B. Moderate amplitude short wave associated with an occluded storm: <br /> <br />23-25 February 1984 <br /> <br />The 23-25 February 1984 storm system was an occluded storm, the center <br />located off the coast of central Washington. Figure 7 shows the 1200, 24 <br /> <br />February 500 mb chart and a satellite photograph taken at 1215. Time sections <br /> <br />of rawinsonde data taken at Sheridan during the storm period are shown on Fig. <br />8. Figure 9 shows th~ radiometric measurements and precipitation measurements <br /> <br />at Kingva.'e during the storm system passage. Precipitation occurred in asso- <br />ciation with a cold frontal system which extended southward through the project <br /> <br />area. <br /> <br />14 <br />