Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Dense Fog Advisory |
| Area(s): | Eastern Toole and Liberty; Hill County; Northern Blaine County; Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft; Helena Valley; Meagher County Valleys; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley |
| Effective: | 2026-10-13 @ 7:55 am -> 2026-10-13 @ 1:00 pm |
| Onset: | 2026-10-13 @ 7:55 am -> 2026-10-13 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-10-13 @ 7:55 am |
| Headline: | Dense Fog Advisory issued October 13 at 6:55AM MDT until October 13 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Highly variable visibility as low as one quarter of a mile in dense fog. * WHERE...Portions of central, north central, and southwest Montana. * WHEN...Until noon MDT today. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Below freezing temperatures may lead to a glaze of ice on surfaces, most notably on bridges and overpasses. |