Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Dense Fog Advisory |
| Area(s): | Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft; Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2026-10-25 @ 2:05 pm -> 2026-10-26 @ 7:00 am |
| Onset: | 2026-10-25 @ 2:05 pm -> 2026-10-26 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-10-25 @ 2:05 pm |
| Headline: | Dense Fog Advisory issued October 25 at 1:05PM MDT until October 26 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Variable visibility down to a quarter mile or less in dense fog. * WHERE...Canyon Ferry Area, Elkhorn and Boulder Mountains, Beaverhead and Western Madison below 6000ft, Gallatin Valley, Gallatin and Madison County Mountains and Centennial Mountains, Madison River Valley, Missouri Headwaters, and Northwest Beaverhead County. * WHEN...Until noon MDT Monday. * IMPACTS...Low visibility could make driving conditions hazardous. Frost deposition may cause roads to become slippery, especially over bridges. * ADDITIONAL DETAILS...Patchy fog is expected to become more widespread and dense tonight into Monday morning. |