A weak upper trough passing through the area will result in a couple inches of new snow today(Friday). This should be a rather low moisture content snow with snow to liquid ratios around 20:1. That is, if 20 inches of snow fell and that snow was melted, it would produce 1 inch of liquid precipitation. A wet snow would have ratios of 10:1 or less.
Examining the morning upper air analysis shows the weak system resulting in today's snow at 700mb(10,000 ft) tracking across the northern Rockies:
700 mb Analysis Friday Morning Feb 17 2012 |
Water Vapor Imagery Friday AM February 17, 2012 |
With the current weak system passing on to the east the associated snow is expected to generally end by this evening.
Looking ahead by late Saturday afternoon, snow will return to the area as the storm now moving toward the Pacific Northwest, although having weakened, will be crossing the Idaho/Western Montana /Western Wyoming region.
700 mb Forecast Saturday evening Feb 18 2012 |
For additional technical information as well as access to other model forecast fields and locations check out this link:
http://www.spc.noaa.gov/exper/sref/eplumes/index.php?PRM=Total-SNO&INC=ALL&NNC=&RT=09&max=&min=&SID=SVR
Greg Carbin the Warning Coordination Meteorologist at the Storm Prediction Center has developed the SREF Display and is looking for feedback.
SREF Forecast Total Snowfall from Friday morning until Monday evening Feb 17-20 2012 for Star Valley |
Given these caveats it does appear that over the weekend, several inches of new snow are likely with the possibility of the most favored valley locations receiving from 4-6 inches along the west slopes of the Salt Range such as Smoot, Turnerville, Bedford and Star Valley Ranch. It does appear that higher elevations in the Tetons and Salt/Wyoming Ranges could get over a foot.
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