Special Weather Statement

Special Weather Statement
National Weather Service Pocatello ID
246 AM MST Thu Nov 20 2025

IDZ058-059-061-201630-
Marsh and Arbon Highlands-Franklin/Eastern Oneida Region-
Bear Lake Valley-
Including the cities of Inkom, McCammon, Downey,
Lava Hot Springs, Malad, Preston, Thatcher, St. Charles,
Montpelier, and Georgetown
246 AM MST Thu Nov 20 2025

...POCKETS OF DENSE FOG/FREEZING FOG THIS MORNING IN THE MARSH
VALLEY, CACHE VALLEY, AND BEAR LAKE VALLEY...

Area observations and webcams indicate visibilities below one
quarter of a mile at times in pockets of dense fog and freezing
fog. Areas particularly affected are the corridor from McCammon
heading south along I-15 and US-91 and along US-30 from Montpelier
south.

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.

$$

Cropp

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.

$$