Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Extreme Heat Warning |
| Area(s): | Hill County; Northern Blaine County; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft |
| Effective: | 2026-07-24 @ 2:31 pm -> 2026-07-25 @ 5:45 am |
| Onset: | 2026-07-24 @ 2:31 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-24 @ 2:31 pm |
| Headline: | Extreme Heat Warning issued July 24 at 1:31PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Dangerously hot conditions. High temperatures between 100 and 107 degrees expected, with overnight temperatures only dropping to the mid to upper 60s. * WHERE...Bears Paw Mountains and Southern Blaine, Cascade County below 5000ft, Fergus County below 4500ft, Hill County, Judith Basin County and Judith Gap, Northern Blaine County, and Western and Central Chouteau County. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. * ADDITIONAL DETAILS...Heat will peak during the day on Saturday, with afternoon and evening high temperatures peaking between 100 and 107 degrees. |
| Alert: | Heat Advisory |
| Area(s): | Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Eastern Pondera and Eastern Teton; Gates of the Mountains; Helena Valley; Meagher County Valleys; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Beaverhead and Western Madison below 6000ft |
| Effective: | 2026-07-24 @ 2:31 pm -> 2026-07-25 @ 5:45 am |
| Onset: | 2026-07-24 @ 2:31 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-24 @ 2:31 pm |
| Headline: | Heat Advisory issued July 24 at 1:31PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...High temperatures up to 100 degrees expected. * WHERE...Portions of central, north central, and southwest Montana. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...The heat will peak on Saturday, with lower elevation temperatures reaching the upper 90s to near 100 degrees. |
| 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: | 2026-07-24 @ 2:09 pm -> 2026-07-25 @ 2:15 pm |
| Onset: | 2026-07-25 @ 1:00 pm -> 2026-07-26 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-24 @ 2:09 pm |
| Headline: | Red Flag Warning issued July 24 at 1:09PM MDT until July 26 at 12:00AM MDT by NWS Billings MT |
| Description: |
The National Weather Service in Billings has issued a Red Flag Warning...which is in effect from noon Saturday to midnight MDT Saturday night. The Fire Weather Watch is no longer in effect. * IMPACTS: Low humidities, hot temperatures, and increasing thunderstorm activity will create erratic fire behavior and new fire starts. * 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: Southwest 10 to 15 mph with gusts up to 25 mph. * THUNDERSTORMS: Widely scattered afternoon and evening thunderstorms will produce gusty and erratic winds, and spotty rainfall. * HUMIDITY: As low as 11 percent. * TEMPERATURES: Up to 108. |
| Alert: | Extreme Heat Warning |
| Area(s): | Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Golden Valley; Northern Big Horn; Southern Rosebud; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills |
| Effective: | 2026-07-24 @ 1:35 pm -> 2026-07-25 @ 1:45 pm |
| Onset: | 2026-07-24 @ 1:35 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-24 @ 1:35 pm |
| Headline: | Extreme Heat Warning issued July 24 at 12:35PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Dangerously hot conditions with high temperatures of 98 to 108, hottest over eastern Montana. Saturday is expected to be the hottest day. * WHERE...Portions of central, south central, and southeast Montana and north central Wyoming. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Dangerously hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress. This heat stress will quickly become dangerous to anyone without adequate cooling and hydration. |
| Alert: | Heat Advisory |
| Area(s): | Northern Park; Red Lodge Foothills; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Northern Sweet Grass; Melville Foothills; Southern Wheatland |
| Effective: | 2026-07-24 @ 1:35 pm -> 2026-07-25 @ 1:45 pm |
| Onset: | 2026-07-24 @ 1:35 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-24 @ 1:35 pm |
| Headline: | Heat Advisory issued July 24 at 12:35PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Hot conditions with high temperatures of 90 to 100. Saturday is expected to be the hottest day. * WHERE...Portions of central and south central Montana. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress. This heat stress will become dangerous to anyone without adequate cooling and hydration. |
| Alert: | Red Flag Warning |
| Area(s): | Eastern Beaverhead National Forest |
| Effective: | 2026-07-24 @ 1:15 pm -> 2026-07-25 @ 10:00 pm |
| Onset: | 2026-07-25 @ 2:00 pm -> 2026-07-25 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-07-24 @ 1:15 pm |
| Headline: | Red Flag Warning issued July 24 at 12:15PM MDT until July 25 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM 1 PM TO 9 PM MDT SATURDAY DUE TO LIGHTNING AND WIND, LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD... The National Weather Service in Missoula MT has issued a Red Flag Warning. * AFFECTED AREA...Fire Weather Zone 111. * TIMING...From 1 PM to 9 PM MDT Saturday. * WINDS...Southwest winds 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent. * THUNDERSTORMS...Isolated to scattered thunderstorms producing minimal precipitation. Erratic outflow winds of 55 to 65 mph possible. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| Alert: | Red Flag Warning |
| Area(s): | Dawson/McCone/Prairie/Richland/Wibaux Counties |
| Effective: | 2026-07-24 @ 1:11 pm -> 2026-07-24 @ 10:00 pm |
| Onset: | 2026-07-24 @ 1:11 pm -> 2026-07-24 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 1:11 pm |
| Headline: | Red Flag Warning issued July 24 at 12:11PM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
* WIND...West at 15 to 25 mph with gusts to 35 mph. * HUMIDITY...As low as 15 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Red Flag Warning |
| Area(s): | 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: | 2026-07-24 @ 1:11 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-24 @ 1:11 pm -> 2026-07-24 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 1:11 pm |
| Headline: | Red Flag Warning issued July 24 at 12:11PM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM 4 PM TO 10 PM MDT SATURDAY FOR LIGHTNING FROM THUNDERSTORMS FOR FIRE WEATHER ZONES 134, 135, 136, AND 137... The National Weather Service in Glasgow has issued a Red Flag Warning, which is in effect from 4 PM to 10 PM MDT Saturday. * WIND...Today: West at 15 to 25 mph with gusts to 35 mph. Saturday: South southwest at 10 to 15 mph with gusts to 25 mph. * HUMIDITY...Today: As low as 15 percent. Saturday: As low as 13 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. * ADDITIONAL DETAILS...Isolated thunderstorms are expected on Saturday, so lightning is the main concern for fire starts. |
| Alert: | Red Flag Warning |
| Area(s): | 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: | 2026-07-24 @ 1:11 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-25 @ 5:00 pm -> 2026-07-25 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 1:11 pm |
| Headline: | Red Flag Warning issued July 24 at 12:11PM MDT until July 25 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM 4 PM TO 10 PM MDT SATURDAY FOR LIGHTNING FROM THUNDERSTORMS FOR FIRE WEATHER ZONES 134, 135, 136, AND 137... The National Weather Service in Glasgow has issued a Red Flag Warning, which is in effect from 4 PM to 10 PM MDT Saturday. * WIND...Today: West at 15 to 25 mph with gusts to 35 mph. Saturday: South southwest at 10 to 15 mph with gusts to 25 mph. * HUMIDITY...Today: As low as 15 percent. Saturday: As low as 13 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. * ADDITIONAL DETAILS...Isolated thunderstorms are expected on Saturday, so lightning is the main concern for fire starts. |
| Alert: | Extreme Heat Warning |
| Area(s): | Daniels; Sheridan |
| Effective: | 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 12:04 pm |
| Headline: | Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with highs up to 102 expected. * WHERE...Daniels and Sheridan Counties. * WHEN...Until 10 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Southwest Phillips; Eastern Roosevelt |
| Effective: | 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 12:04 pm |
| Headline: | Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with highs up to 106 expected. * WHERE...Dawson, Eastern Roosevelt, Prairie, Richland, Southwest Phillips, Western Roosevelt, and Wibaux Counties. * WHEN...Until 10 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-24 @ 1:00 pm -> 2026-07-24 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 12:04 pm |
| Headline: | Lake Wind Advisory issued July 24 at 11:04AM MDT until July 24 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with highs up to 105 expected. For the Lake Wind Advisory, west winds 15 to 25 mph with gusts up to 35 mph expected. * WHERE...Fort Peck Lake, Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...For the Extreme Heat Warning, until 10 PM MDT Sunday. 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...Waves up to 4 feet are expected over Fort Peck Lake today. |
| Alert: | Extreme Heat Warning |
| Area(s): | Northern Phillips; Northern Valley |
| Effective: | 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 12:04 pm |
| Headline: | Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with highs up to 105 expected. * WHERE...Northern Phillips and Northern Valley Counties. * WHEN...Until 10 PM MDT Sunday. * 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; McCone |
| Effective: | 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am |
| Onset: | 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-24 @ 12:04 pm |
| Headline: | Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with highs up to 105 expected. For the Lake Wind Advisory, west winds 15 to 25 mph with gusts up to 35 mph expected. * WHERE...Fort Peck Lake, Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...For the Extreme Heat Warning, until 10 PM MDT Sunday. 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...Waves up to 4 feet are expected over Fort Peck Lake today. |
| 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; Central and Eastern Lewis and Clark National Forest Areas |
| Effective: | 2026-07-24 @ 12:28 am -> 2026-07-24 @ 7:15 pm |
| Onset: | 2026-07-24 @ 11:00 am -> 2026-07-25 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-24 @ 12:28 am |
| Headline: | Red Flag Warning issued July 23 at 11:28PM MDT until July 25 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 and Central and Eastern Lewis and Clark National Forest Areas. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 100 on Friday and up to 106 on Saturday. * THUNDERSTORMS...Isolated to widely scattered showers and thunderstorms may cause localized strong, and erratic wind gusts and lightning, mostly over zones 115 and 117 Saturday afternoon. * IMPACTS...Containment of any ongoing or new fires may be very difficult. |