Special Weather Statement
National Weather Service Riverton WY
Yellowstone National Park-Absaroka Mountains-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Including the cities of Lake, Mammoth, Old Faithful, Jackson,
Afton, Alpine, Star Valley Ranch, Thayne, and Pinedale
Significant Snow Event Expected for far Western Wyoming for
Monday Night into Tuesday.
A late Spring snowstorm is expected for Far Western Wyoming for
Monday night into Tuesday as a strong low pressure center tracks
northeast from Idaho, across Yellowstone Park, and into Montana.
An associated strong cold front will track southeast across Western
Wyoming Monday. Numerous thunderstorms, some with small hail,
locally heavy rainfall, and gusty winds will accompany the front.
After the cold air begins to advect into the area Monday, the snow
level will drop to about 8000 feet msl Monday evening before
reaching the valley floor by Tuesday morning. The bulk of the
snowfall will continue through Tuesday in the Western Wyoming
mountains. By late Tuesday, 6 to 12 inches of snowfall are expected
across the Western Mountains along with 1 to 2 inches in the Western
Valleys where rain will mix in with the snow.
In addition to the snow, west winds of 25 to 35 mph will accompany
the snowfall along with some gusts of 45 mph on exposed ridges. This
wind may cause blowing and drifting of snow across Togwotee and
Teton Pass Tuesday. Wind chills will likely be in the 20s over
Anyone with any outdoor interests in these areas Monday night and
Tuesday should prepare for sharply colder temperatures and a drastic
change to winter weather, especially over the higher mountains of
Western Wyoming. Anyone traveling from areas east of the Continental
Divide where temperatures will be in the 80s Monday should prepare
for temperatures 40 to 50 degrees colder over far Western Wyoming by
Tuesday. If traveling in these areas, prepare for slick and snow
covered roads, especially over Teton and Togwotee Pass. Mainly
slushy and west roads are anticipated for the Jackson and Star
Valleys Tuesday morning.