Yellowstone National Park, Wyoming

Regional Weather Alerts


     
Alert: Dense Fog Advisory
Area(s): Judith Basin County and Judith Gap; Fergus County below 4500ft; Snowy and Judith Mountains
Effective: 2026-10-30 @ 12:23 am -> 2026-10-30 @ 1:00 pm
Onset: 2026-10-30 @ 12:23 am -> 2026-10-30 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-10-30 @ 12:23 am
Headline: Dense Fog Advisory issued October 29 at 11:23PM MDT until October 30 at 12:00PM MDT by NWS Great Falls MT
Description: * WHAT...Variable visibility down to one quarter mile in dense
 freezing fog.
* WHERE...Snowy and Judith Mountains, Fergus County below 4500ft, and
 Judith Basin County and Judith Gap.
* WHEN...Until noon MDT Friday.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Some roadways or bridges could be frost or ice
 covered and slippery.
Alert: Dense Fog Advisory
Area(s): Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Southern High Plains; Eastern Pondera and Eastern Teton; Cascade County below 5000ft; Gates of the Mountains
Effective: 2026-10-30 @ 12:23 am -> 2026-10-30 @ 1:00 pm
Onset: 2026-10-30 @ 12:23 am -> 2026-10-30 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-10-30 @ 12:23 am
Headline: Dense Fog Advisory issued October 29 at 11:23PM MDT until October 30 at 12:00PM MDT by NWS Great Falls MT
Description: * WHAT...Variable visibility down to one quarter mile in dense
 freezing fog.
* WHERE...Gates of the Mountains, Cascade County below 5000ft,
 Eastern Glacier, Western Toole, and Central Pondera, Eastern
 Pondera and Eastern Teton, Northern High Plains, and Southern High
 Plains.
* WHEN...Until noon MDT Friday.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Some roadways or bridges could be frost or ice
 covered and slippery.
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