National Snow Analyses

Click On Map for Regional Analyses	Automated Model Discussion: December 21, 2010   Area Covered By Snow: 46.0%   Area Covered Last Month: 22.6% Snow Depth   Average: 5.0 in   Minimum: 0.0 in   Maximum: 903.8 in   Std. Dev.: 10.9 in Snow Water Equivalent   Average: 0.9 in   Minimum: 0.0 in   Maximum: 428.7 in   Std. Dev.: 2.3 in
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Snow Water Equivalent Animate: Season --- Two weeks --- One Day	Snow Depth Animate: Season --- Two weeks --- One Day	Average Snowpack Temp Animate: Season --- Two weeks --- One Day
SWE Change Animate: Season --- Two weeks --- One Day	Snow Precipitation Animate: Season --- Two weeks --- One Day	Snow Melt Animate: Season --- Two weeks --- One Day
Blowing Snow Sublimation Animate: Season --- Two weeks --- One Day	Surface Sublimation Animate: Season --- Two weeks --- One Day	Non-Snow Precipitation Animate: Season --- Two weeks --- One Day

Weather Summary

Heavy snow and rain continued in the central and southern West on Monday as onshore flow continued beneath a strong jet stream. Another 1 to 2 feet of snow fell at higher elevations in the Sierra Nevada through Utah; up to a foot fell in Colorado. One to 2 inches of rain fell at lower elevations in the Southwest. Storm-total snowfall amounts in the Sierra Nevada exceed 4 feet in many areas and 8 feet in a few. In the interior West, many areas have received more than 2 feet of snowfall; some areas have more than 4 feet. Widespread flooding is occurring in the Southwest.

A midlevel disturbance paired with a surface trough moved southeastward across the north-central U.S. and caused an arc of snowfall from eastern Montana through northern Illinois Nearly a foot of snow fell in North Dakota; snowfall amounts decreased to about 1/2 foot in western Minnesota and in southwestern Wisconsin. Little rain fell with this system, but freezing rain and drizzle occurred.

Moderate snowmelt occurred with above-freezing temperatures and rainfall around the Four Corners area yesterday. Slow snowmelt occurred on the southern edge of the snowpack in the Plains and Midwest.

Heavy high-elevation snowfall and lower-elevation rainfall will continue along the West Coast and into the Great Basin during the next couple of days as the main offshore trough moves slowly inland. Another 2 to 4 feet of snowfall is probable in the Sierra Nevada; about half of that is likely in the inland mountains, especially in and around Utah. Quiet conditions are expected on Thursday, but precipitation will start again on Friday and continue through the weekend as another coastal system nears the coast.

The remaining energy from this system will form a surface low in Colorado which will move eastward. A surface trough will extend northward from this low, beneath an upper trough, as these features move eastward. A half foot of snowfall is likely in the middle Missouri River basin on Thursday.

Snow Reports

Note: these data are unofficial and provisional.
Zip codes (where available) of observations will be included in text files after October 7, 2008.

Station Snowfall Reports
Station Snow Water Equivalent Reports
Station Snowdepth Reports

Interpolated Snowfall Products

Model Assimilation

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