Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flood Advisory |
| Area(s): | Carter, MT |
| Effective: | 2026-07-23 @ 5:22 pm -> 2026-07-23 @ 8:15 pm |
| Onset: | 2026-07-23 @ 5:22 pm -> 2026-07-23 @ 8:15 pm |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-23 @ 5:22 pm |
| Headline: | Flood Advisory issued July 23 at 4:22PM MDT until July 23 at 7:15PM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...South Central Carter County in southeastern Montana... * WHEN...Until 715 PM MDT. * IMPACTS...Flooding in low-lying and poor drainage areas. Rises in streams and rivers. * ADDITIONAL DETAILS... - At 419 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2 inches of rain have fallen. - Some locations that will experience flooding include... Mainly rural areas of South Central Carter County. - http://www.weather.gov/safety/flood |
| 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: | 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: | 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): | 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: | 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: | 2026-07-23 @ 2:57 pm -> 2026-07-24 @ 7:00 am |
| 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 2026-07-23 @ 2:57 pm |
| Headline: | Red Flag Warning issued July 23 at 1:57PM MDT until July 25 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
The National Weather Service in Great Falls has issued a Red Flag Warning for hot temperatures, gusty winds, and low relative humidity, which is in effect from 10 AM Friday to 9 PM MDT Saturday. The Fire Weather Watch is no longer in effect. * 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...Near 100 on Friday and up to 105 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: | 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: | 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 @ 1:52 pm -> 2026-07-24 @ 2:00 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 @ 1:52 pm |
| Headline: | Extreme Heat Warning issued July 23 at 12:52PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Dangerously hot conditions with high temperatures of 100 to 108, hottest in the east. 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...Very warm nighttime temperatures will provide only limited relief. |
| Alert: | Heat Advisory |
| Area(s): | Northern Park; Paradise Valley; Livingston Area |
| Effective: | 2026-07-23 @ 1:52 pm -> 2026-07-24 @ 2:00 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 @ 1:52 pm |
| Headline: | Heat Advisory issued July 23 at 12:52PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Hot conditions with high temperatures of 94 to 101. * WHERE...Livingston Area, Northern Park, and Paradise Valley. * WHEN...From 9 AM Friday to 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Warm nighttime temperatures will provide limited relief. |
| Alert: | Heat Advisory |
| Area(s): | Red Lodge Foothills; Judith Gap; Beartooth Foothills; Northern Sweet Grass; Melville Foothills; Southern Wheatland |
| Effective: | 2026-07-23 @ 1:52 pm -> 2026-07-24 @ 2:00 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 @ 1:52 pm |
| Headline: | Heat Advisory issued July 23 at 12:52PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Hot conditions with high temperatures of 95 to 102. 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...Warm nighttime temperatures will provide limited relief. |
| 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: | 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-25 @ 1:00 pm -> 2026-07-25 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-23 @ 1:51 pm |
| Headline: | Extreme Heat Warning issued July 23 at 12:51PM MDT until July 25 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...For the first Heat Advisory through Saturday morning, temperatures up to 101 F. For the Extreme Heat Warning Saturday afternoon and evening, dangerously hot conditions with temperatures up to 108 F. For the second Heat Advisory Saturday night into Sunday, temperatures up to 101 F. * 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...For the first Heat Advisory, from noon Friday to noon MDT Saturday. For the Extreme Heat Warning, from noon to 9 PM MDT Saturday. For the second Heat Advisory, from 9 PM Saturday to 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. |
| Alert: | Heat Advisory |
| 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: | 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-24 @ 1:00 pm -> 2026-07-25 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-23 @ 1:51 pm |
| Headline: | Heat Advisory issued July 23 at 12:51PM MDT until July 25 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...For the first Heat Advisory through Saturday morning, temperatures up to 101 F. For the Extreme Heat Warning Saturday afternoon and evening, dangerously hot conditions with temperatures up to 108 F. For the second Heat Advisory Saturday night into Sunday, temperatures up to 101 F. * 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...For the first Heat Advisory, from noon Friday to noon MDT Saturday. For the Extreme Heat Warning, from noon to 9 PM MDT Saturday. For the second Heat Advisory, from 9 PM Saturday to 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. |
| 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: | 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am |
| 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 2026-07-23 @ 1:51 pm |
| Headline: | Heat Advisory issued July 23 at 12:51PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...High temperatures up to 100F expected. * WHERE...Portions of central, north central, and southwest Montana. * WHEN...From noon Friday to 9 PM MDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Heat Advisory |
| 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: | 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am |
| Onset: | 2026-07-25 @ 10:00 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-23 @ 1:51 pm |
| Headline: | Heat Advisory issued July 23 at 12:51PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...For the first Heat Advisory through Saturday morning, temperatures up to 101 F. For the Extreme Heat Warning Saturday afternoon and evening, dangerously hot conditions with temperatures up to 108 F. For the second Heat Advisory Saturday night into Sunday, temperatures up to 101 F. * 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...For the first Heat Advisory, from noon Friday to noon MDT Saturday. For the Extreme Heat Warning, from noon to 9 PM MDT Saturday. For the second Heat Advisory, from 9 PM Saturday to 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. |
| 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. |