Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Severe Thunderstorm Warning |
| Area(s): | Broadwater, MT; Gallatin, MT; Jefferson, MT; Lewis and Clark, MT; Meagher, MT |
| Effective: | 2026-07-24 @ 1:11 am -> 2026-07-24 @ 1:30 am |
| Onset: | 2026-07-24 @ 1:11 am -> 2026-07-24 @ 1:30 am |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Immediate |
| Issued By: | NWS Great Falls MT on 2026-07-24 @ 1:11 am |
| Headline: | Severe Thunderstorm Warning issued July 24 at 12:11AM MDT until July 24 at 12:30AM MDT by NWS Great Falls MT |
| Description: |
At 1211 AM MDT, severe thunderstorms were located along a line extending from 13 miles east of East Helena to 6 miles west of Three Forks, moving east at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Townsend, Belgrade, Three Forks, Manhattan, Toston, Fort Logan On The Smith River, Fort Logan, Missouri Headwaters State Park, Logan, Winston, Radersburg, Maudlow, Silos, Trident, Willow Creek, Menard, Madison Buffalo Jump State Park, and Goose Bay. Those attending the Headwaters Country Jam are in the path of these storms and should prepare for IMMINENT DANGEROUS WEATHER CONDITIONS. SEEK SHELTER NOW! |
| Alert: | Flood Advisory |
| Area(s): | Silver Bow, MT |
| Effective: | 2026-07-24 @ 12:43 am -> 2026-07-24 @ 2:45 am |
| Onset: | 2026-07-24 @ 12:43 am -> 2026-07-24 @ 2:45 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-07-24 @ 12:43 am |
| Headline: | Flood Advisory issued July 23 at 11:43PM MDT until July 24 at 1:45AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Central Silver Bow County in west central Montana... * WHEN...Until 145 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 1143 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. Overflowing poor drainage areas will cause minor flooding in the advisory area. Between 0.3 and 0.5 inches of rain have fallen. - Additional rainfall amounts of 0.1 to 0.2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Butte and Walkerville. - https://www.weather.gov/mso/hydrology |
| 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. |
| 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 @ 12:21 am -> 2026-07-24 @ 3:30 pm |
| Onset: | 2026-07-24 @ 1:00 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-24 @ 12:21 am |
| Headline: | Heat Advisory issued July 23 at 11:21PM 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...From noon Friday to 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. |
| 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 @ 12:21 am -> 2026-07-24 @ 3:30 pm |
| Onset: | 2026-07-24 @ 1:00 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-24 @ 12:21 am |
| Headline: | Extreme Heat Warning issued July 23 at 11:21PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Dangerously hot conditions. High temperatures between 100 and 106 degrees expected. * 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...From noon Friday to 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. |
| 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: | 2026-07-23 @ 10:44 pm -> 2026-07-24 @ 10:45 pm |
| Onset: | 2026-07-24 @ 10:00 am -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-23 @ 10:44 pm |
| Headline: | Heat Advisory issued July 23 at 9:44PM 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...From 9 AM Friday to 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: | 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: | 2026-07-23 @ 10:44 pm -> 2026-07-24 @ 10:45 pm |
| Onset: | 2026-07-24 @ 10:00 am -> 2026-07-26 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-23 @ 10:44 pm |
| Headline: | Extreme Heat Warning issued July 23 at 9:44PM 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...From 9 AM Friday to 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: | Extreme Heat Warning |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-23 @ 3:05 pm |
| Headline: | Extreme Heat Warning issued July 23 at 2:05PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 106 expected. For the Lake Wind Advisory, west winds 10 to 15 mph with gusts up to 30 mph expected. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...For the Extreme Heat Warning, from 10 AM Friday to 10 PM MDT Sunday. For the Lake Wind Advisory, from noon to 6 PM MDT Friday. * 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. |
| Alert: | Heat Advisory |
| Area(s): | Northern Phillips; Northern Valley |
| Effective: | 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-23 @ 3:05 pm |
| Headline: | Heat Advisory issued July 23 at 2:05PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Heat index values up to 105 expected. * WHERE...Northern Phillips and Northern Valley Counties. * WHEN...From 10 AM Friday to 10 PM MDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Extreme Heat Warning |
| Area(s): | Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Southwest Phillips; Eastern Roosevelt |
| Effective: | 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-23 @ 3:05 pm |
| Headline: | Extreme Heat Warning issued July 23 at 2:05PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with heat index values up to 108 expected. * WHERE...Dawson, Eastern Roosevelt, Prairie, Richland, Southwest Phillips, Western Roosevelt, and Wibaux Counties. * WHEN...From 10 AM Friday to 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: | 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 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 2026-07-23 @ 3:05 pm |
| Headline: | Lake Wind Advisory issued July 23 at 2:05PM MDT until July 24 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 106 expected. For the Lake Wind Advisory, west winds 10 to 15 mph with gusts up to 30 mph expected. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...For the Extreme Heat Warning, from 10 AM Friday to 10 PM MDT Sunday. For the Lake Wind Advisory, from noon to 6 PM MDT Friday. * 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. |
| Alert: | Fire Weather Watch |
| 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: | 2026-07-23 @ 2:13 pm -> 2026-07-24 @ 2:15 pm |
| Onset: | 2026-07-25 @ 1:00 pm -> 2026-07-26 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-23 @ 2:13 pm |
| Headline: | Fire Weather Watch issued July 23 at 1:13PM MDT until July 26 at 12:00AM MDT by NWS Billings MT |
| Description: |
The National Weather Service in Billings has issued a Fire Weather Watch...which is in effect from Saturday afternoon through Saturday evening. * IMPACTS: Low humidities, hot temperatures, and high-based thunderstorms with gusty and erratic outflow winds may 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 20 mph with gusts to 25 mph. * THUNDERSTORMS: Scattered afternoon and evening thunderstorms will produce gusty and erratic winds, and spotty rainfall. * HUMIDITY: Minimums of 12 to 19 percent. * TEMPERATURES: Highs of 99 to 107 below 5000 feet, hottest in the east. |
| Alert: | Red Flag Warning |
| Area(s): | 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: | 2026-07-23 @ 1:15 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-24 @ 11:00 am -> 2026-07-24 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-23 @ 1:15 pm |
| Headline: | Red Flag Warning issued July 23 at 12:15PM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
The National Weather Service in Glasgow has issued a Red Flag Warning, which is in effect from 10 AM to 9 PM MDT Friday. The Fire Weather Watch is no longer in effect. * 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. |