Special Weather Statement
Special Weather Statement
National Weather Service Riverton WY
307 AM MST Thu Nov 20 2025
WYZ013-017>020-023-025>028-201700-
Jackson Hole-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Star Valley-
Upper Green River Basin Foothills-Upper Green River Basin-
South Lincoln County-Rock Springs and Green River-
Including the cities of Jackson, Riverton, Shoshoni, Lander,
Jeffrey City, Casper, Afton, Alpine, Star Valley Ranch, Thayne,
Pinedale, La Barge, Big Piney, Farson, Kemmerer, Cokeville,
Rock Springs, and Green River
307 AM MST Thu Nov 20 2025
...PATCHY AREAS OF FOG THIS MORNING ACROSS PORTIONS OF WESTERN,
SOUTHERN, AND CENTRAL WYOMING...
Clearing skies and ample moisture have led to the development of
patchy areas of fog across portions of the state this morning.
Visibilities of less than one mile have already been observed
along US 20/26 from Casper to Hiland. Other locations such as Star
Valley have seen fog develop, leading to reduced visibilities of
less than one mile as well.
* WHAT...Patchy areas of fog leading to decreased visibilities of
less than one mile.
* WHERE...Portions of Western, Southern, and Central WY. Locations
such as Star Valley, Jackson Hole, Green River Basin, Wind River
Basin, and Natrona County.
* WHEN...Through 10 AM Thursday.
* ADDITIONAL DETAILS... If needing to drive through these areas
this morning, allow extra time for your commute and be prepared
for sudden drops in visibility. Slow down, use low beam
headlights, and leave extra space between you and other
motorists.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Riverton WY
314 AM MST Thu Nov 20 2025
WYZ001>020-022>030-211415-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Teton and Gros Ventre Mountains-
Jackson Hole-Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
314 AM MST Thu Nov 20 2025
...Special Weather Statement Due to Patchy Areas of Fog Has Been
Posted for Portions of Western, Southern, and Central WY to 10 AM
Thursday...
This Hazardous Weather Outlook is for Western and Central Wyoming.
.DAY ONE...Today and tonight.
Patchy areas of fog with visibilities less than one mile have begun
to develop across portions of western, southern, and central WY this
morning. Fog will likely linger through the morning gradually
dissipating by the late morning hours. Isolated showers will be
possible this morning mainly over western and southern WY.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Friday... Near seasonable temperatures with scattered showers
possible across portions of western and southern WY.
.SPOTTER INFORMATION STATEMENT...
Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.
$$
Hazardous Weather Outlook
National Weather Service North Platte NE
407 AM CST Thu Nov 20 2025
NEZ004>010-022>029-035>038-056>059-069>071-094-211015-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
407 AM CST Thu Nov 20 2025 /307 AM MST Thu Nov 20 2025/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Today and tonight.
Patchy dense fog will persist across much of western and north
central Nebraska through late this morning.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
No hazardous weather is expected at this time.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service Cheyenne WY
301 AM MST Thu Nov 20 2025
NEZ002-003-019>021-054-055-095-096-WYZ101>119-211015-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
301 AM MST Thu Nov 20 2025
This hazardous weather outlook is for portions of panhandle
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.
.DAY ONE...TODAY AND TONIGHT
Model disagreement and variability remains high for the up-coming
system tonight into early Friday morning. Lighter snow accumulations
possible along I-80, while higher amounts possible in the mountains.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
First real shot of cold air could arrive as early as Tuesday, with
high temperatures possibly in the 20s and 30s Tuesday, Wednesday,
and Thursday.
.Spotter information statement...
Spotter activation will not be needed.
$$
Hazardous Weather Outlook
National Weather Service Grand Junction CO
155 AM MST Thu Nov 20 2025
COZ001>014-017>023-UTZ022>025-027>029-210900-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-Upper Gunnison River Valley-
Uncompahgre Plateau and Dallas Divide-Northwest San Juan Mountains-
Southwest San Juan Mountains-Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
155 AM MST Thu Nov 20 2025
This Hazardous Weather Outlook is for northwest Colorado, southwest
Colorado, west central Colorado, east central Utah, northeast Utah
and southeast Utah.
.DAY ONE...Today and tonight.
Accumulating snowfall is likely, mainly for the San Juans today
shifting into the central and northern mountains tonight. Expect a
few isolated thundershowers generally south of I-70 through the
afternoon with lightning and gusty winds the primary threats.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Light accumulating snowfall is likely, mainly for central and
northern Colorado mountains Friday. The San Juan Mountains could see
another round of light snow showers Sunday into early next week with
little if any impacts.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected today or tonight, however
spotters are encouraged to report snowfall amounts to the
National Weather Service in Grand Junction.
$$
