WWUS75 KBYZ 211057

NPWBYZ



URGENT - WEATHER MESSAGE

National Weather Service Billings MT

457 AM MDT Mon Sep 21 2026



MTZ029-030-034-042-057-058-063-138-141-170-172-173-228-235-WYZ199-

211600-

/O.NEW.KBYZ.FG.Y.0003.260921T1057Z-260921T1600Z/

Musselshell-Treasure-Northern Stillwater-Golden Valley-Northern

Big Horn-Southern Rosebud-Judith Gap-Southern Big Horn-Northern

Sweet Grass-Northern Carbon-Melville Foothills-Northeastern

Yellowstone-Southern Wheatland-Southwestern Yellowstone-Sheridan

Foothills-

Including the locations of Joliet, Pryor, Fromberg, Harlowton,

Hardin, Billings, Ryegate, Big Timber, Hysham, Sheridan, Judith Gap,

Lodge Grass, Roundup, Columbus, Absarokee, Lame Deer, Lavina, Crow

Agency, Melville, Pompeys Pillar, and Custer

457 AM MDT Mon Sep 21 2026



...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM MDT THIS MORNING...



* WHAT...Areas of dense fog producing visibility one quarter mile or

  less.



* WHERE...Portions of central, south central, and southeast Montana

  and north central Wyoming.



* WHEN...Until 10 AM MDT this morning.



* IMPACTS...Morning travelers can expect to encounter areas of very

  poor visibility. This includes portions of Interstate 90 from Big

  Timber to Billings, Hardin and Sheridan. Portions of Interstate 94,

  US-191, and US-212 will also be impacted. Please use caution and

  allow extra time for your morning commute.



* ADDITIONAL DETAILS...Fog will slowly dissipate in the mid to late

  morning.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



If driving, slow down, use your low beam headlights, and leave plenty

of distance ahead of you.



&&



$$



Additional graphics for this hazard can be found at

http://www.weather.gov/billings



JKL