Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Fire Weather Watch |
| Area(s): | Kootenai National Forest/Talley Lake District/fnf; Western Lolo National Forest; Salish and Kootenai Indian Reservation |
| Effective: | 2026-08-21 @ 5:30 pm -> 2026-08-22 @ 1:30 am |
| Onset: | 2026-08-22 @ 6:00 pm -> 2026-08-23 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-08-21 @ 5:30 pm |
| Headline: | Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 12:00PM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH SUNDAY MORNING DUE TO LIGHTNING FOR KOOTENAI, WEST LOLO, AND FLATHEAD RESERVATION... ...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD AND EAST BEAVERHEAD... ... .Antecedent conditions have been very dry and warm. The Kootenai Forest especially has received well below normal precipitation since early July. Thunderstorms with little to no precipitation Saturday evening and overnight will be followed Sunday with a dry cold front. Increased winds and lowering relative humidities behind the front on Sunday will potentially bring critical fire weather conditions to southwest Montana. The National Weather Service in Missoula MT has issued a Fire Weather Watch. * AFFECTED AREA...Fire Weather Zones 104, 106, and 107. * TIMING...From Saturday afternoon through Sunday morning. * LIGHTNING...Afternoon and evening thunderstorms will transition to nocturnal thunderstorms. Dry surface conditions could lead to lightning producing storms with little to no precipitation. * OUTFLOW WINDS...Through 9 pm erratic winds 25 to 40 mph. * IMPACTS...Lightning strikes will have the potential to start new fires, and gusty outflow winds could cause rapid spread of new and existing wildfires. |
| Alert: | Fire Weather Watch |
| Area(s): | Deerlodge/Western Beaverhead National Forest; Eastern Beaverhead National Forest |
| Effective: | 2026-08-21 @ 5:30 pm -> 2026-08-22 @ 1:30 am |
| Onset: | 2026-08-23 @ 1:00 pm -> 2026-08-23 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-08-21 @ 5:30 pm |
| Headline: | Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH SUNDAY MORNING DUE TO LIGHTNING FOR KOOTENAI, WEST LOLO, AND FLATHEAD RESERVATION... ...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD AND EAST BEAVERHEAD... ... .Antecedent conditions have been very dry and warm. The Kootenai Forest especially has received well below normal precipitation since early July. Thunderstorms with little to no precipitation Saturday evening and overnight will be followed Sunday with a dry cold front. Increased winds and lowering relative humidities behind the front on Sunday will potentially bring critical fire weather conditions to southwest Montana. The National Weather Service in Missoula MT has issued a Fire Weather Watch. * AFFECTED AREA...Fire Weather Zones 110 and 111. * TIMING...From Sunday afternoon through Sunday evening. * WINDS...Southwest winds 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent. * IMPACTS...Any new or existing fires may spread rapidly. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-08-21 @ 1:39 pm -> 2026-08-22 @ 5:00 am |
| Onset: | 2026-08-22 @ 1:00 pm -> 2026-08-23 @ 4:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-21 @ 1:39 pm |
| Headline: | Lake Wind Advisory issued August 21 at 12:39PM MDT until August 23 at 3:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Southeast winds 15 to 20 mph with gusts up to 30 mph expected. * WHERE...Fort Peck Lake. * WHEN...From noon Saturday to 3 AM MDT Sunday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Wave heights up to 3 feet. |