National Snow Analyses

Click On Map for Regional Analyses	Automated Model Discussion: April 21, 2011   Area Covered By Snow: 15.8%   Area Covered Last Month: 19.3% Snow Depth   Average: 4.2 in   Minimum: 0.0 in   Maximum: 1018.9 in   Std. Dev.: 18.4 in Snow Water Equivalent   Average: 1.4 in   Minimum: 0.0 in   Maximum: 494.4 in   Std. Dev.: 6.5 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

A surface low over Lake Erie yesterday morning moved through the Northeast yesterday, and a weak secondary low developed in southern Quebec. Up to 10 inches of snow fell in northern and central Maine. To the southwest where warmer temperatures were present, up to an inch of rain fell in northern Vermont and the Adirondacks.

The snowpack across the Great Lakes through the Northeast continues to be warm and slowly melt. Melting also occurred in the northern Plains despite a cooler snowpack. In the West, little snow can be found at lower elevations; higher-elevation snow is warm and slowly melting.

The secondary surface low in southern Quebec will move northeastward out to sea by tonight, and little additional precipitation is expected with this feature.

A fast-moving midlevel trough off the Northwest coast this morning will move quickly across the northern U.S. during the rest of the week. Around 1/2 foot of snowfall is probable at higher elevations in the northern Rockies today, and light snowfall is probable in the northern Plains tonight and around Lake Superior tomorrow. The system is expected to be warm enough on Saturday to bring around 1/2 inch of rainfall to the Northeast.

Behind this disturbance will be a larger, deeper trough which will move slowly through the West this weekend. Around 1/2 foot of higher-elevation snowfall is expected in southern Colorado and northern New Mexico this weekend.

Moderately-strong onshore flow into the Northwest will develop on Sunday and continue through midweek. A rain/snow mix is expected at higher elevations and rain is likely at middle and lower elevations.

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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