Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flood Advisory |
| Area(s): | Big Horn, MT |
| Effective: | 2026-07-15 @ 8:26 pm -> 2026-07-15 @ 11:30 pm |
| Onset: | 2026-07-15 @ 8:26 pm -> 2026-07-15 @ 11:30 pm |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 8:26 pm |
| Headline: | Flood Advisory issued July 15 at 7:26PM MDT until July 15 at 10:30PM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Northwestern Big Horn County in south central Montana... * WHEN...Until 1030 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 724 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 2.5 inches of rain have fallen. - This includes the following streams and drainages... Bighorn River between St. Xavier and Hardin. Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Mainly rural areas of Northwestern Big Horn County. - http://www.weather.gov/safety/flood |
| Alert: | Special Weather Statement |
| Area(s): | Northern Big Horn; Southern Big Horn |
| Effective: | 2026-07-15 @ 8:13 pm -> 2026-07-15 @ 9:15 pm |
| Onset: | 2026-07-15 @ 8:13 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 8:13 pm |
| Headline: | Special Weather Statement issued July 15 at 7:13PM MDT by NWS Billings MT |
| Description: |
At 713 PM MDT, Doppler radar was tracking a line of strong thunderstorms extending from 7 miles north of Hardin to 11 miles south of Crow Agency, or extending from 7 miles north of Hardin to 21 miles south of Hardin, moving east at 15 mph. HAZARD...Wind gusts up to 40 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... Hardin, Crow Agency and Crow Indian Reservation. |
| Alert: | Flood Advisory |
| Area(s): | Yellowstone, MT |
| Effective: | 2026-07-15 @ 8:00 pm -> 2026-07-15 @ 9:30 pm |
| Onset: | 2026-07-15 @ 8:00 pm -> 2026-07-15 @ 9:30 pm |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 8:00 pm |
| Headline: | Flood Advisory issued July 15 at 7:00PM MDT until July 15 at 8:30PM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall continues. * WHERE...West Central Yellowstone County in south central Montana... * WHEN...Until 830 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 659 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 2.5 inches of rain have fallen. - Flooding impacts will continue, but no additional rainfall is expected. - Some locations that will experience flooding include... Acton. - http://www.weather.gov/safety/flood |
| Alert: | Special Weather Statement |
| Area(s): | Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft |
| Effective: | 2026-07-15 @ 7:47 pm -> 2026-07-15 @ 8:30 pm |
| Onset: | 2026-07-15 @ 7:47 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-15 @ 7:47 pm |
| Headline: | Special Weather Statement issued July 15 at 6:47PM MDT by NWS Great Falls MT |
| Description: |
At 646 PM MDT, Doppler radar was tracking a strong thunderstorm 12 miles southwest of Dillon, moving northeast at 35 mph. HAZARD...Wind gusts up to 40 mph and half-inch 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... Dillon, Bannack, Beaverhead Rock State Park, Bannack State Park, and Glen. |
| Alert: | Flood Watch |
| Area(s): | Musselshell; Northern Stillwater; Golden Valley; Red Lodge Foothills; Northern Big Horn; Paradise Valley; Livingston Area; Beartooth Foothills; Absaroka/Beartooth Mountains; Southern Big Horn; Southeastern Carbon; Northern Sweet Grass; Bighorn Canyon; Northern Carbon; Pryor/Northern Bighorn Mountains; Melville Foothills; Northeastern Yellowstone; Southwestern Yellowstone; Northeast Bighorn Mountains; Sheridan Foothills |
| Effective: | 2026-07-15 @ 2:50 pm -> 2026-07-16 @ 4:00 am |
| Onset: | 2026-07-15 @ 2:50 pm -> 2026-07-16 @ 4:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-15 @ 2:50 pm |
| Headline: | Flood Watch issued July 15 at 1:50PM MDT until July 16 at 3:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flash flooding caused by excessive rainfall from thunderstorms is possible. The risk of flash flooding includes recent burn scars such as the Robertson Draw and East Side Fires south of Red Lodge, and the Elk Fire along the eastern slopes of the Bighorn Mountains. * WHERE...Portions of Montana, including the following areas, Absaroka/Beartooth Mountains, Beartooth Foothills, Bighorn Canyon, Golden Valley, Livingston Area, Melville Foothills, Musselshell, Northeastern Yellowstone, Northern Big Horn, Northern Carbon, Northern Stillwater, Northern Sweet Grass, Paradise Valley, Pryor/Northern Bighorn Mountains, Red Lodge Foothills, Southeastern Carbon, Southern Big Horn and Southwestern Yellowstone and north central Wyoming, including the following areas, Northeast Bighorn Mountains and Sheridan Foothills. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Expect slow-moving thunderstorms capable of producing very high rainfall rates. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Northern Park; Judith Gap; Crazy Mountains; Southern Wheatland |
| Effective: | 2026-07-15 @ 2:50 pm -> 2026-07-16 @ 4:00 am |
| Onset: | 2026-07-15 @ 2:50 pm -> 2026-07-16 @ 4:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-15 @ 2:50 pm |
| Headline: | Flood Watch issued July 15 at 1:50PM MDT until July 16 at 3:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central and south central Montana, including the following areas, in central Montana, Judith Gap and Southern Wheatland. In south central Montana, Crazy Mountains and Northern Park. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Slow moving showers and thunderstorms capable of producing very heavy rainfall rates. - http://www.weather.gov/safety/flood |
| Alert: | Extreme Heat Warning |
| Area(s): | Custer; Fallon; Powder River; Carter |
| Effective: | 2026-07-15 @ 2:18 pm -> 2026-07-16 @ 1:00 am |
| Onset: | 2026-07-15 @ 2:18 pm -> 2026-07-16 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 2:18 pm |
| Headline: | Extreme Heat Warning issued July 15 at 1:18PM MDT until July 16 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Very hot conditions with high temperatures of 98 to 103 degrees on Wednesday. * WHERE...Carter, Custer, Fallon, and Powder River. * WHEN...Until midnight MDT tonight. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Very warm nighttime temperatures will provide only limited relief. |
| Alert: | Flash Flood Watch |
| Area(s): | Big Belt, Bridger and Castle Mountains |
| Effective: | 2026-07-15 @ 12:51 pm -> 2026-07-17 @ 1:00 am |
| Onset: | 2026-07-16 @ 3:00 pm -> 2026-07-17 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-07-15 @ 12:51 pm |
| Headline: | Flash Flood Watch issued July 15 at 11:51AM MDT until July 17 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Horse Gulch Burn Scar. * WHERE...A portion of central Montana, including the following area, Big Belt, Bridger and Castle Mountains. * WHEN...From Thursday afternoon through Thursday evening. * IMPACTS...Heavy rainfall over the Horse Gulch Burn Scar is expected up to and during the period of the watch. Rainfall rates of 0.25 to 0.75 of an inch per hour are possible with thunderstorms. Residents near the Horse Gulch Burn Scar should prepare for potential debris flow. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas, urbanized street flooding, and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the burn scar, which may lead to flash flooding and debris flows. - Some locations that may experience flash flooding include... Maudlow, Trident and York. - http://www.weather.gov/safety/flood |
| Alert: | Extreme Heat Warning |
| Area(s): | Richland; Dawson; Prairie; Wibaux |
| Effective: | 2026-07-15 @ 12:40 pm -> 2026-07-16 @ 3:00 am |
| Onset: | 2026-07-15 @ 12:40 pm -> 2026-07-16 @ 3:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-15 @ 12:40 pm |
| Headline: | Extreme Heat Warning issued July 15 at 11:40AM MDT until July 16 at 2:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with high temperatures in the upper 90s to around 100 degrees. * WHERE...Dawson, Prairie, Richland, and Wibaux Counties. * WHEN...Until 2 AM MDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |