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Halloween Ushers in First Widespread Snow of the Season

Snow began falling across western Wyoming on Saturday, October 30.  The moist autumn system provided snowfall to the far west valleys and mountains as it pushed east.  Early Halloween morning this storm system pushed across the Continental Divide accompanied by a cold front.  Upslope flow developed in the Fremont and Natrona counties and portions of the Big Horn Basin as the cold front pushed south.  This allowed for persistent snowfall from Halloween morning into the evening hours.

Below are snowfall totals received by WFO Riverton as of 7:50 p.m. Halloween.

Location Snowfall (inches)
Yellowstone National Park
Lewis Lake 12
South Entrance 7
Teton County
Rendezvous Peak - Raymer 9
Jackson Hole - mid mountain 6 to 7
Togwotee Pass 3 to 4
Jackson Hole - base 2
Jackson 1
Fremont County
Lander 4
Hudson 3.5
Riverton 2 to 3
Sweetwater Station 2
Jeffrey City 1 to 2
Natrona County
Casper Mountain 9 to 10
Casper 4 to 7
Arminto 5
Hiland 4
Hell's Half Acre 3
Powder River 2
Alcova Trace
Washakie County
6 miles east of Ten Sleep 6.5
Big Trails 3 to 4
Lincoln County
Star Valley Ranch 5
Smoot 4.5
2 miles north of Kemmerer 2
Salt River Range
Willow Creek SNOTEL 11 to 12
Cottonwood Creek SNOTEL 8 to 9
Blind Bull Summit 7
Wind River Mountains
Deer Park SNOTEL 7
South Pass SNOTEL 5
Hobbs Park SNOTEL 4
Townsend Creek SNOTEL 4
Bighorn Mountains
Shell Creek SNOTEL 6 to 7
Powder River Pass SNOTEL 5
Bone Springs Divide SNOTEL 4
Green River Basin
Boulder 1
Pinedale 1 or less
SNOTEL site - snowfall determined by weighted water equivalent and average temperature

In Riverton, Halloween has been the scene for some extreme weather over the years.  Below are some statistics regarding historical data from the Riverton Cooperative site dating as far back as 1907.  Except for the average high and low, all data has been updated to account for 2004.  You will note that of the 98 Halloweens documented, just slightly more than 1 in 5 see any precipitation.

Average High/Low 51/22
Record High 77 (1950)
Record Low -6 (1971)
Coldest High 17 (1971)
Warmest Low 47 (1933)
Most Snow Ever 7" (1928)
Greatest Snow Depth 18" (1971)
Most Precipitation 0.59"( 1928)
Days with Measurable Precipitation 16
Days with Any Precipitation 20

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