Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | High Wind Warning |
| Area(s): | East Glacier Park Region; Northern High Plains |
| Effective: | 2026-08-02 @ 3:37 am -> 2026-08-02 @ 1:00 pm |
| Onset: | 2026-08-02 @ 3:37 am -> 2026-08-02 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-08-02 @ 3:37 am |
| Headline: | High Wind Warning issued August 2 at 2:37AM MDT until August 2 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...West winds 25 to 35 mph with gusts up to 65 mph expected. Isolated wind prone areas along the Rocky Mountain Front will see gusts to 75 mph. * WHERE...East Glacier Park Region Zone, and Northern High Plains. * WHEN...Until noon MDT today. * IMPACTS...Damaging winds will blow down trees and power lines. Travel could be difficult, especially for high profile vehicles. Recreationists should be aware of any trees that could fall while establishing camps or hiking. |
| Alert: | Extreme Heat Warning |
| Area(s): | Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft |
| Effective: | 2026-08-02 @ 3:37 am -> 2026-08-02 @ 1:00 pm |
| Onset: | 2026-08-02 @ 3:37 am -> 2026-08-02 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-08-02 @ 3:37 am |
| Headline: | Extreme Heat Warning issued August 2 at 2:37AM MDT until August 2 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Mild overnight temperatures near or above 70F offering little relief from the heat. * WHERE...Bears Paw Mountains and Southern Blaine, Fergus County below 4500ft, and Western and Central Chouteau County. * WHEN...Until noon MDT today. * IMPACTS...Heat related illnesses increase significantly during extreme heat. * ADDITIONAL DETAILS...Daytime temperatures will not rise drastically today from overnight lows. |
| Alert: | High Wind Warning |
| Area(s): | Eastern Glacier, Western Toole, and Central Pondera |
| Effective: | 2026-08-02 @ 3:37 am -> 2026-08-02 @ 1:00 pm |
| Onset: | 2026-08-02 @ 3:37 am -> 2026-08-02 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-08-02 @ 3:37 am |
| Headline: | High Wind Warning issued August 2 at 2:37AM MDT until August 2 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...West winds 25 to 35 mph with gusts up to 60 mph. * WHERE...Eastern Glacier, Western Toole, and Central Pondera. * WHEN...Until noon MDT today. * IMPACTS...Damaging winds will blow down trees and power lines. Travel could be difficult, especially for high profile vehicles. Hot temperatures may cause heat illnesses. |
| Alert: | Red Flag Warning |
| Area(s): | Gallatin National Forest; Wheatland County/Sweet Grass County; Stillwater County; Beartooth Ranger District Custer National Forest; Golden Valley County/Musselshell County; Yellowstone County; Crow Indian Reservation/Big Horn Canyon Rec Area; Northern Rosebud/Northern Treasure Counties; Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM; Bighorn National Forest |
| Effective: | 2026-08-02 @ 2:14 am -> 2026-08-02 @ 10:00 pm |
| Onset: | 2026-08-02 @ 2:14 am -> 2026-08-02 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-08-02 @ 2:14 am |
| Headline: | Red Flag Warning issued August 2 at 1:14AM MDT until August 2 at 9:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities, hot temperatures, gusty winds, and wind shifts with two cold fronts will create erratic fire behavior. * AFFECTED AREA: In North Central WY Fire Zones...274...284. In South Central MT Fire Zones...123...124...125...126...127 128...129. In Southeast MT Fire Zones...130...131...132. In Southeast MT and Northwest SD Fire Zone...133. * COUNTIES AFFECTED: In Central MT...Golden Valley...Musselshell...Wheatland. In North Central WY...Big Horn...Johnson...Sheridan...Washakie. In Northwest SD...Harding. In South Central MT...Big Horn...Carbon...Park...Stillwater Sweet Grass...Yellowstone. In Southeast MT...Carter...Custer...Fallon...Powder River Rosebud...Treasure. In Southwest MT...Gallatin. * WIND: Northwest 10 to 15 with gusts to 25 mph along and behind a cold front tonight into Sunday morning. Winds become east over the plains and southwest over the mountains Sunday afternoon. Northeast winds will get gusty again this evening as another cold front moves through the region. * HUMIDITY: In the Teens. * TEMPERATURES: Mid 90s. * COLD FRONT: A cold front will move through the area overnight into mid morning. Another push of cooler air arrives early this evening. |
| Alert: | Red Flag Warning |
| Area(s): | Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; Dawson/McCone/Prairie/Richland/Wibaux Counties; Northern Valley and Northern Phillips Counties; The Little Rockies; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties |
| Effective: | 2026-08-02 @ 2:07 am -> 2026-08-02 @ 10:00 pm |
| Onset: | 2026-08-02 @ 2:07 am -> 2026-08-02 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:07 am |
| Headline: | Red Flag Warning issued August 2 at 1:07AM MDT until August 2 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
...CRITICAL FIRE WEATHER CONCERNS THIS WEEKEND... * WIND...West to northwest winds with speeds at 15 to 25 mph with gusts to 35 mph. * HUMIDITY...minimum relative humidity ranging 8 to 20%. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Extreme Heat Warning |
| Area(s): | McCone |
| Effective: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:15 pm |
| Onset: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:05 am |
| Headline: | Extreme Heat Warning issued August 2 at 1:05AM MDT until August 2 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot overnight conditions with temperatures in the low 70s. For the Lake Wind Advisory, northwest winds 10 to 20 mph with gusts up to 35 mph. * WHERE...McCone County including Fort Peck Lake. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Wave heights up to 3 feet expected. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield |
| Effective: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:15 pm |
| Onset: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:05 am |
| Headline: | Lake Wind Advisory issued August 2 at 1:05AM MDT until August 2 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot overnight conditions with temperatures around 70. For the Lake Wind Advisory, northwest winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, and Petroleum Counties including Fort Peck Lake. * WHEN...For the Extreme Heat Warning, until noon MDT today. For the Lake Wind Advisory, until 6 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Wave heights up to 3 feet expected. |
| Alert: | Lake Wind Advisory |
| Area(s): | McCone |
| Effective: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:15 pm |
| Onset: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:05 am |
| Headline: | Lake Wind Advisory issued August 2 at 1:05AM MDT until August 2 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot overnight conditions with temperatures in the low 70s. For the Lake Wind Advisory, northwest winds 10 to 20 mph with gusts up to 35 mph. * WHERE...McCone County including Fort Peck Lake. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Wave heights up to 3 feet expected. |
| Alert: | Extreme Heat Warning |
| Area(s): | Daniels; Sheridan; Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Eastern Roosevelt |
| Effective: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:15 pm |
| Onset: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:05 am |
| Headline: | Extreme Heat Warning issued August 2 at 1:05AM MDT until August 2 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot overnight conditions with temperatures in the upper 60s to low 70s. * WHERE...Daniels, Dawson, Roosevelt, Prairie, Richland, Sheridan, and Wibaux Counties. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield |
| Effective: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:15 pm |
| Onset: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:05 am |
| Headline: | Extreme Heat Warning issued August 2 at 1:05AM MDT until August 2 at 12:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot overnight conditions with temperatures around 70. For the Lake Wind Advisory, northwest winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, and Petroleum Counties including Fort Peck Lake. * WHEN...For the Extreme Heat Warning, until noon MDT today. For the Lake Wind Advisory, until 6 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Wave heights up to 3 feet expected. |
| Alert: | Extreme Heat Warning |
| Area(s): | Northern Phillips; Southwest Phillips; Northern Valley |
| Effective: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:00 pm |
| Onset: | 2026-08-02 @ 2:05 am -> 2026-08-02 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-02 @ 2:05 am |
| Headline: | Extreme Heat Warning issued August 2 at 1:05AM MDT until August 2 at 12:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot overnight conditions with temperatures in the mid 60s to low 70s. * WHERE...Northern Phillips, Northern Valley, and Southwest Phillips Counties. * WHEN...Until noon MDT today. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Red Flag Warning |
| Area(s): | Eastern Glacier/Toole/Central/Eastern Pondera/Liberty; Hill and Blaine Counties; Lewis and Clark National Forest Rocky Mountain District-Rocky Mountain Front; Chouteau and Fergus Counties; Lincoln Ranger District of the Helena National Forest; Central and Eastern Lewis and Clark National Forest Areas; Helena and Townsend Ranger Districts of the Helena National Forest |
| Effective: | 2026-08-01 @ 11:11 pm -> 2026-08-02 @ 4:00 pm |
| Onset: | 2026-08-01 @ 11:11 pm -> 2026-08-02 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-08-01 @ 11:11 pm |
| Headline: | Red Flag Warning issued August 1 at 10:11PM MDT until August 2 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* AFFECTED AREA...Eastern Glacier/Toole/Central/Eastern Pondera/Liberty, Hill and Blaine Counties, Lewis and Clark National Forest Rocky Mountain District-Rocky Mountain Front, Chouteau and Fergus Counties, Lincoln Ranger District of the Helena National Forest, Central and Eastern Lewis and Clark National Forest Areas and Helena and Townsend Ranger Districts of the Helena National Forest. * WINDS...West 10 to 20 mph with gusts up to 45 mph. Along the Rocky Mountain Front, west winds 30 to 40 mph with gusts up to 60 mph and isolated cases of 75 mph. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 90. * COLD FRONT...A cold front will arrive Sunday evening and shift the winds from westerly to more northerly. * IMPACTS...Any fires that develop will spread rapidly. Containment of any ongoing or new fires may be very difficult. Outdoor burning is not recommended. |
| Alert: | Fire Weather Watch |
| Area(s): | Deerlodge/Western Beaverhead National Forest; Eastern Beaverhead National Forest |
| Effective: | 2026-07-31 @ 2:11 pm -> 2026-07-31 @ 2:26 pm |
| Onset: | 2026-08-01 @ 3:00 pm -> 2026-08-02 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-07-31 @ 2:11 pm |
| 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; Eastern Beaverhead National Forest |
| Effective: | 2026-07-31 @ 2:11 pm -> 2026-07-31 @ 10:15 pm |
| Onset: | 2026-08-01 @ 3:00 pm -> 2026-08-02 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-07-31 @ 2:11 pm |
| Headline: | Red Flag Warning issued July 31 at 1:11PM MDT until August 2 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IS CANCELLED FOR CLEARWATER/NEZ PERCE... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM PDT SATURDAY DUE TO WIND SHIFT, MOISTURE DROP AND WIND, LOW RELATIVE HUMIDITY FOR PALOUSE/HELLS CANYON... ...RED FLAG WARNING IN EFFECT FROM 2 PM SATURDAY TO MIDNIGHT MDT SATURDAY NIGHT DUE TO WIND AND LOW RELATIVE HUMIDITY FOR A PORTION OF MT... ...RED FLAG WARNING IN EFFECT FROM 2 PM SATURDAY TO 9 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD AND EAST BEAVERHEAD... ... .A ridge breakdown and dry frontal passage will bring critical fire weather to the region. The National Weather Service in Missoula MT has issued a Red Flag Warning in effect from 2 PM Saturday to 9 PM MDT Sunday. * AFFECTED AREA...Fire Weather Zones 110 and 111. * TIMING...From 2 PM Saturday to 9 PM MDT Sunday. * WINDS...West winds 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...Relative Humidity between 8 to 20 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |