Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-09-04 @ 1:40 am -> 2026-09-04 @ 3:00 pm |
| Onset: | 2026-09-04 @ 7:00 am -> 2026-09-04 @ 3:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-09-04 @ 1:40 am |
| Headline: | Lake Wind Advisory issued September 4 at 12:40AM MDT until September 4 at 2:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Southeast winds 15 to 25 mph with gusts up to 30 mph expected. * WHERE...Fort Peck Lake. * WHEN...From 6 AM this morning to 2 PM MDT this afternoon. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...The strongest winds will be over the eastern half of the lake. Wave up to 4 feet are expected. |
| Alert: | Red Flag Warning |
| Area(s): | Dawson/McCone/Prairie/Richland/Wibaux Counties |
| Effective: | 2026-09-04 @ 1:36 am -> 2026-09-04 @ 10:00 pm |
| Onset: | 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-09-04 @ 1:36 am |
| Headline: | Red Flag Warning issued September 4 at 12:36AM MDT until September 4 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
The National Weather Service in Glasgow has issued a Red Flag Warning, which is in effect from 9 AM this morning to 9 PM MDT this evening. * AFFECTED AREA...Fire weather zone 122. * WIND...Southeast 15 to 30 mph becoming south to southwest in the afternoon. * HUMIDITY...as low as 14 percent. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Red Flag Warning |
| Area(s): | Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM |
| Effective: | 2026-09-03 @ 10:17 pm -> 2026-09-04 @ 10:00 pm |
| Onset: | 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-09-03 @ 10:17 pm |
| Headline: | Red Flag Warning issued September 3 at 9:17PM MDT until September 4 at 9:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities, unseasonably warm temperatures, and strong gusty winds will create erratic fire behavior. * AFFECTED AREA: In North Central WY Fire Zone...274. In Southeast MT Fire Zones...131...132. In Southeast MT and Northwest SD Fire Zone...133. * COUNTIES AFFECTED: In North Central WY...Sheridan. In Northwest SD...Harding. In South Central MT...Big Horn. In Southeast MT...Carter...Custer...Fallon...Powder River Rosebud...Treasure. * WIND: South 10 to 20 mph with gusts 25 to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Up to 98. |
| Alert: | Red Flag Warning |
| Area(s): | Crow Indian Reservation/Big Horn Canyon Rec Area; Bighorn National Forest |
| Effective: | 2026-09-03 @ 10:17 pm -> 2026-09-04 @ 10:00 pm |
| Onset: | 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-09-03 @ 10:17 pm |
| Headline: | Red Flag Warning issued September 3 at 9:17PM MDT until September 4 at 9:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities, unseasonably warm temperatures, and strong gusty winds will create erratic fire behavior. * AFFECTED AREA: In North Central WY Fire Zone...284. In South Central MT Fire Zone...129. * COUNTIES AFFECTED: In North Central WY...Big Horn...Johnson...Sheridan...Washakie. In South Central MT...Big Horn...Carbon...Yellowstone. * WIND: South 10 to 20 mph with gusts 25 to 35 mph. * HUMIDITY: As low as 10 percent. * ADDITIONAL DETAILS: The worst conditions are expected across the lower elevations. * TEMPERATURES: Up to 96. |