Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Red Flag Warning |
| Area(s): | Custer County; Sioux Ranger District Custer National Forest |
| Effective: | 2026-08-06 @ 1:50 am -> 2026-08-06 @ 9:00 pm |
| Onset: | 2026-08-06 @ 12:00 pm -> 2026-08-06 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-08-06 @ 1:50 am |
| Headline: | Red Flag Warning issued August 6 at 12:50AM MDT until August 6 at 8:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities, hot temperatures, gusty winds, and a wind shift with a cold front will create erratic fire behavior. * AFFECTED AREA: In Southeast MT Fire Zone...132. In Southeast MT and Northwest SD Fire Zone...133. * COUNTIES AFFECTED: In Northwest SD...Harding. In Southeast MT...Carter...Custer...Fallon. * COLD FRONT: A cold front will move through Thursday afternoon and evening shifting winds out of the northwest and increasing wind speeds. * WIND: West 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Up to 95 degrees. |
| Alert: | Red Flag Warning |
| Area(s): | Dawson/McCone/Prairie/Richland/Wibaux Counties; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties |
| Effective: | 2026-08-05 @ 5:17 pm -> 2026-08-06 @ 8:00 pm |
| Onset: | 2026-08-06 @ 12:00 pm -> 2026-08-06 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-05 @ 5:17 pm |
| Headline: | Red Flag Warning issued August 5 at 4:17PM MDT until August 6 at 7:00PM MDT by NWS Glasgow MT |
| Description: |
* WIND...Northwest at 15 to 25 mph with gusts to 35 mph. * HUMIDITY...As low as 12 percent. * THUNDERSTORMS...None * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-08-05 @ 11:29 am -> 2026-08-06 @ 5:15 am |
| Onset: | 2026-08-06 @ 10:00 am -> 2026-08-06 @ 8:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-05 @ 11:29 am |
| Headline: | Lake Wind Advisory issued August 5 at 10:29AM MDT until August 6 at 7:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Northwest winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Fort Peck Lake. * WHEN...From 9 AM to 7 PM MDT Thursday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Waves up to 4 feet are expected. |