Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Dense Fog Advisory |
| Area(s): | Elkhorn and Boulder Mountains; Missouri Headwaters; Madison River Valley; Gallatin Valley |
| Effective: | 2026-10-26 @ 12:06 pm -> 2026-10-26 @ 4:00 pm |
| Onset: | 2026-10-26 @ 12:06 pm -> 2026-10-26 @ 4:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-10-26 @ 12:06 pm |
| Headline: | Dense Fog Advisory issued October 26 at 11:06AM MDT until October 26 at 3:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Elkhorn and Boulder Mountains, Gallatin Valley, Madison River Valley, and Missouri Headwaters. * WHEN...Until 3 PM MDT this afternoon. * IMPACTS...Low visibility could make driving conditions hazardous. Frost deposition may cause roads to become slippery, especially over bridges. |
| Alert: | Special Weather Statement |
| Area(s): | Eastern Glacier, Western Toole, and Central Pondera; Southern High Plains; Eastern Pondera and Eastern Teton |
| Effective: | 2026-10-26 @ 11:46 am -> 2026-10-26 @ 2:00 pm |
| Onset: | 2026-10-26 @ 11:46 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-10-26 @ 11:46 am |
| Headline: | Special Weather Statement issued October 26 at 10:46AM MDT by NWS Great Falls MT |
| Description: |
Patchy dense fog has developed over portions of the Rocky Mountain Front and the I-15 corridor this morning. Rapid reductions in visibility down to a quarter mile will be possible through the early afternoon. Those traveling should be alert for variable road conditions with sudden reductions in visibility. Freezing fog can cause isolated slippery spots on roads. When driving, slow down and use low beam headlights. |
| Alert: | Winter Weather Advisory |
| Area(s): | Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2026-10-26 @ 4:19 am -> 2026-10-26 @ 7:00 pm |
| Onset: | 2026-10-26 @ 10:00 pm -> 2026-10-27 @ 7:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-10-26 @ 4:19 am |
| Headline: | Winter Weather Advisory issued October 26 at 3:19AM MDT until October 27 at 6:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Snow expected. Total snow accumulations 2 to 5 inches. Winds gusting as high as 40 mph. * WHERE...Gallatin and Madison County Mountains and Centennial Mountains. * WHEN...From 9 PM this evening to 6 AM MDT Tuesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-10-26 @ 12:05 am -> 2026-10-27 @ 5:00 am |
| Onset: | 2026-10-26 @ 12:05 am -> 2026-10-27 @ 5:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-10-26 @ 12:05 am |
| Headline: | Lake Wind Advisory issued October 25 at 11:05PM MDT until October 27 at 4:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Southeast winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Fort Peck Lake. * WHEN...Until 4 AM MDT Tuesday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Expect wave heights up to 4 feet. |
