> February 1 and 2, 2003 Snow Event 

Strong Winter Storm Brings Heavy Snow To Central and Southwest Wyoming

        A vigorous upper level disturbance moving through the central Rockies coupled with strong, moist upslope flow resulted in a significant winter storm this past weekend.  The snow was heaviest across central and southwest Wyoming Saturday night and Sunday.  A deep surface low pressure system over southern Wyoming and high pressure over Montana caused the upslope flow to develop late Saturday night.  The beginning of the heavy snow occurred following the passage of a strong cold front that moved south across western Wyoming Saturday evening and overnight.  Surface observations showed that the front plunged through the Big Horn Basin between 8 PM and 10 PM MST Saturday night, and through the Casper and Riverton areas between 10 PM and 11 PM.  Prior to the arrival of the colder air rain had fallen Friday and Saturday over northern Wyoming.  Rainfall totals at and near the East Entrance of Yellowstone National Park (elevation 6500-7000 feet) for Friday ranged from 1/3 to 1/2 inch.  Despite a few school district closures Monday morning and some drifting snow, the storm delivered some much needed precipitation to western and central Wyoming.

        The heaviest snow fell across a large area, including Johnson, Natrona, Fremont, Sublette, and Lincoln counties where 6 to 12 inches of snow was common.  Lesser amounts were noted in Sweetwater county; however, strong east winds of 30 to 45 mph with a peak gust of 61 mph at 12:18 PM MST on Sunday at the Rock Springs airport.  The wind and snow produced Blizzard conditions across Sweetwater county late Sunday morning and afternoon causing numerous accidents along Interstate 80.  Drifting snow of 1 to 3 feet was found elsewhere, with drifts of 3 to 5 feet at the Riverton NWS office.

Storm Total Snowfall
Location Amount (inches)
Sinks Canyon west of Lander 15 to 20
Pine Creek Ski area east of Cokeville 18
Squaw Creek west of Lander 15
Lander 12 to 14
South Pass City 12
Jeffrey City 10
Owl Creek Mountains 9
Hudson 9
Riverton 7 to 9
Meadowlark Lodge
-west slope Bighorn Mtns-
Kemmerer 8
Opal 8
Base of Casper Mountain 8
Casper 6
Thermopolis 6
Buffalo 6
Kaycee 6
Sunlight Basin 6
Afton 6
Smoot 6
Cokeville 6
Farson 6
Pinedale 6
Cora 5
Ten Sleep 5
Rock Springs 4
Green River 4
Dubois 4
Fossil Butte 4
Boysen Reservoir 4
Boulder 4
Reliance 4
Star Valley Ranch 4
Old Faithful 4
Shoshoni 3
Granger 3
Point of Rocks
-central Sweetwater county-
Mammoth 2
East Entrance Yellowstone NP 2
Daniel 2
Cody 2
Wamsutter 2
Clark 1

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Wyoming Map with Snowfall Totals - Feb 1-2, 2003

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