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<br />occurs near ground level close to the crest. Bands appear to <br />have seedable regions only on the south side of imbedded <br />convective cells. Cells with unobstructed sources of moisture to <br />the south seem to provide larger seedable regions. Post-frontal <br />convective cells appear to be highly seedable near their formation <br />zone at the 1000 m elevation and less seedable as the~y progress <br />toward the crest. High liquid water content, low ice crystal <br />concentrations, and strong updrafts over a relatively small area <br />occur on the southwest side of cells. Low liquid water contents, <br />high ice crystal concentrations, and weak downdrafts over a large <br />area occur on the northeast side of cells. <br /> <br />7. Prefrontal storm conditions are strongly influenced by a <br />low-level jet of warm, moist air which blows parallel to the <br />barrier. The low-level jet is present across the entire Sacramento- <br />San Joaquin Valley. The average height of the jet's maximum <br />speed is about 1.7 km. The direction of the jet ranges from S-SE <br />to W-SW with an average direction of 180.. The average speed is <br />28 mls with a range from 11 m/s to 57 m/s. The low-level jet <br />intensifies with the approach of the front and with the approach <br />of individual bands. Moisture appears to be fed into the southeast <br />side of bands and frontal clouds by this jet. <br /> <br />8. Strong subsidence occurs between bands. As bands cross the <br />Sacramento-San Joaquin Valley, precipitation from prE!ceding <br /> <br />1-10 <br /> <br />e <br /> <br />" <br /> <br />- <br /> <br />... <br /> <br />- <br />