Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | Lower Clark Fork Region |
| Effective: | 2026-08-23 @ 12:36 am -> 2026-08-23 @ 1:00 am |
| Onset: | 2026-08-23 @ 12:36 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-08-23 @ 12:36 am |
| Headline: | Special Weather Statement issued August 22 at 11:36PM MDT by NWS Missoula MT |
| Description: |
At 1136 PM MDT, Doppler radar was tracking a strong thunderstorm 9 miles southwest of Superior, moving northeast at 30 mph. HAZARD...Wind gusts up to 50 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Superior, Riverbend, Lozeau, Quartz and Keystone. |
| Alert: | Special Weather Statement |
| Area(s): | Northern Clearwater Mountains; Southern Clearwater Mountains; Lower Clark Fork Region; Missoula/Bitterroot Valleys; Bitterroot/Sapphire Mountains |
| Effective: | 2026-08-23 @ 12:24 am -> 2026-08-23 @ 1:00 am |
| Onset: | 2026-08-23 @ 12:24 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-08-23 @ 12:24 am |
| Headline: | Special Weather Statement issued August 22 at 11:24PM MDT by NWS Missoula MT |
| Description: |
At 1124 PM MDT /1024 PM PDT/, Doppler radar was tracking a line of strong thunderstorms extending from 7 miles southwest of Superior to 12 miles west of Florence, or extending from 7 miles southwest of Superior to 23 miles southwest of Missoula, moving northeast at 30 mph. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Superior, Lolo, Alberton, Tarkio, Riverbend, Florence, Cyr, Quartz, Lolo Hot Springs, Lozeau, Stark, Ninemile, Lolo Pass and Keystone. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-08-22 @ 1:49 pm -> 2026-08-23 @ 4:00 am |
| Onset: | 2026-08-22 @ 1:49 pm -> 2026-08-23 @ 4:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-22 @ 1:49 pm |
| Headline: | Lake Wind Advisory issued August 22 at 12:49PM MDT until August 23 at 3:00AM 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 3 AM MDT Sunday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Waves up to 3 feet possible. |
| Alert: | Red Flag Warning |
| Area(s): | Kootenai National Forest/Talley Lake District/fnf; Western Lolo National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-23 @ 7:00 am |
| Onset: | 2026-08-22 @ 6:00 pm -> 2026-08-23 @ 7:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | Red Flag Warning issued August 22 at 9:08AM MDT until August 23 at 6:00AM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IS CANCELLED FOR FLATHEAD RESERVATION AND EAST BEAVERHEAD... ...RED FLAG WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 AM MDT SUNDAY DUE TO LIGHTNING FOR KOOTENAI AND WEST LOLO... ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 8 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST 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 bring critical fire weather conditions to southwest Montana across Fire Weather Zone 110. The National Weather Service in Missoula MT has issued a Red Flag Warning in effect from 5 PM this afternoon to 6 AM MDT Sunday. * AFFECTED AREA...Fire Weather Zones 104 and 106. * TIMING...From 5 PM this afternoon to 6 AM MDT Sunday. * LIGHTNING...Multiple rounds of thunderstorms expected this afternoon, evening, and overnight into early Sunday morning. Little to any precipitation is expected with dry thunderstorms. * OUTFLOW WINDS...Through 10 pm thunderstorms will bring outflow winds up to 50 mph. 5% chance for isolated wind gusts near 60 mph for any given location. * 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): | Salish and Kootenai Indian Reservation |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-22 @ 10:24 am |
| Onset: | 2026-08-22 @ 6:00 pm -> 2026-08-23 @ 1:00 pm |
| Severity: | Minor |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | The Fire Weather Watch has been cancelled. |
| Description: |
The Fire Weather Watch has been cancelled and is no longer in effect. |
| Alert: | Fire Weather Watch |
| Area(s): | Kootenai National Forest/Talley Lake District/fnf; Western Lolo National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-22 @ 10:24 am |
| Onset: | 2026-08-22 @ 6:00 pm -> 2026-08-23 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation. |
| Description: |
The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation. |
| Alert: | Red Flag Warning |
| Area(s): | Deerlodge/Western Beaverhead National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-23 @ 9:00 pm |
| Onset: | 2026-08-23 @ 2:00 pm -> 2026-08-23 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | Red Flag Warning issued August 22 at 9:08AM MDT until August 23 at 8:00PM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IS CANCELLED FOR FLATHEAD RESERVATION AND EAST BEAVERHEAD... ...RED FLAG WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 AM MDT SUNDAY DUE TO LIGHTNING FOR KOOTENAI AND WEST LOLO... ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 8 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST 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 bring critical fire weather conditions to southwest Montana across Fire Weather Zone 110. The National Weather Service in Missoula MT has issued a Red Flag Warning in effect from 1 PM to 8 PM MDT Sunday. * AFFECTED AREA...Fire Weather Zone 110. * TIMING...From 1 PM to 8 PM MDT Sunday. * WINDS...Southwest winds 15 to 20 mph with gusts of 25 to 40 mph. * RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| Alert: | Fire Weather Watch |
| Area(s): | Eastern Beaverhead National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-22 @ 10:24 am |
| Onset: | 2026-08-23 @ 1:00 pm -> 2026-08-23 @ 10:00 pm |
| Severity: | Minor |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | The Fire Weather Watch has been cancelled. |
| Description: |
The Fire Weather Watch has been cancelled and is no longer in effect. |
| Alert: | Fire Weather Watch |
| Area(s): | Deerlodge/Western Beaverhead National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-22 @ 10:24 am |
| Onset: | 2026-08-23 @ 1:00 pm -> 2026-08-23 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation. |
| Description: |
The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation. |