May 21, 2013
...Storm Moves Into The Northwest/Northern Rockies...
...Temperatures Will 10 To 20 Degrees Below Average From The
Mississippi Valley To The Appalachians...
Front Moving Onshore Over The Pacific Northwest On Saturday Will
Move Eastward To The Northern High Plains/Great Basin By Sunday
Evening. The Storm Will Produce Light Rain Over The Pacific
Northwest To Parts Of Northern California And Northern Rockies By
Saturday Evening. The Rain Will Change Over To Snow As Cold Air Filters Into The Northwest Overnight Saturday.
The Snow Will Expand Into The Great Basin On Sunday And Into Parts Of The Northern Plains/Middle Missouri Valley By Sunday Evening. Pockets Of Rain Will Also Develop Over Parts Of The Northern High Plains/Northern Plains That Will Change Over To Snow After The Front Passes. Mountain Snow And Lower Elevation Rain Will Likewise Develop Over Parts Of The Great Basin/Central Rockies On Sunday.
Meanwhile ... Upper-Level Energy Embedded In Deep Upper-Level
Trough Will Continue To Produce Light Scattered Snow Over Parts Of
The Tennessee Valley/Central Appalachians That Will Wane On
Saturday Night.
In Addition ... Counter-Clockwise Flow Around An Upper-Level Low Over The Northeast Will Produce Light Snow And Lake Enhanced Snow Over Parts Of The Northeast And Lower Great Lakes Through Sunday Evening.
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