🟡 Moderate

Dense Fog Advisory

Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Powder River; Carter; Northern Big Horn; Southern Rosebud; Southern Big Horn; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills

Dense Fog Advisory issued October 31 at 9:12PM MDT until November 1 at 12:00PM MST by NWS Billings MT

Alert Description

* WHAT...Pockets of dense fog with visibility down to one quarter mile or less at times. * WHERE...Portions of central, south central, and southeast Montana and north central Wyoming. * WHEN...Until noon MST Sunday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Some roadways or bridges could be frost or ice covered and slippery.

Safety Instructions

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Time Information

Effective

Nov 1, 2026, 3:12 AM

Expires

Nov 1, 2026, 11:15 AM

Issued

Nov 1, 2026, 3:12 AM

Alert Details

Severity

Moderate

Urgency

Expected

Certainty

Likely

Issued By

NWS Billings MT

National Weather Service