Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flood Advisory |
| Area(s): | Musselshell, MT; Yellowstone, MT |
| Effective: | 2026-07-15 @ 12:35 am -> 2026-07-15 @ 2:00 am |
| Onset: | 2026-07-15 @ 12:35 am -> 2026-07-15 @ 2:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 12:35 am |
| Headline: | Flood Advisory issued July 14 at 11:35PM MDT until July 15 at 1:00AM MDT by NWS Billings MT |
| Description: |
Thunderstorms produced very heavy rain earlier this evening, and may result in localized flooding. * WHAT...Flooding caused by excessive rainfall continues. * WHERE...South Central Musselshell County in central Montana... North Central Yellowstone County in south central Montana... * WHEN...Until 100 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. * ADDITIONAL DETAILS... - At 1132 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 3 inches of rain has fallen. Additional rainfall should be a half inch or less. - Some locations that will experience flooding include... Mainly rural areas of South Central Musselshell and North Central Yellowstone Counties, in and near the Bull Mountains. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Southern High Plains; 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; Upper Blackfoot and MacDonald Pass; Gates of the Mountains; Little Belt and Highwood Mountains; Snowy and Judith Mountains; Helena Valley; Big Belt, Bridger and Castle Mountains; Meagher County Valleys; Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Gallatin Valley |
| Effective: | 2026-07-15 @ 12:33 am -> 2026-07-15 @ 1:45 am |
| Onset: | 2026-07-15 @ 12:33 am -> 2026-07-15 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-07-15 @ 12:33 am |
| Headline: | Flood Watch issued July 14 at 11:33PM MDT until July 15 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
The Flood Watch will expire for portions of central, north central, and southwest Montana. The flash flooding threat has ended. Therefore, the Flood Watch will expire at midnight MDT tonight. |
| Alert: | Severe Thunderstorm Warning |
| Area(s): | Big Horn, MT; Treasure, MT; Yellowstone, MT |
| Effective: | 2026-07-15 @ 12:31 am -> 2026-07-15 @ 1:30 am |
| Onset: | 2026-07-15 @ 12:31 am -> 2026-07-15 @ 1:30 am |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Immediate |
| Issued By: | NWS Billings MT on 2026-07-15 @ 12:31 am |
| Headline: | Severe Thunderstorm Warning issued July 14 at 11:31PM MDT until July 15 at 12:30AM MDT by NWS Billings MT |
| Description: |
SVRBYZ The National Weather Service in Billings has issued a * Severe Thunderstorm Warning for... North Central Big Horn County in south central Montana... East Central Yellowstone County in south central Montana... Central Treasure County in southeastern Montana... * Until 1230 AM MDT. * At 1131 PM MDT, a severe thunderstorm was located 14 miles southwest of Custer, or 17 miles north of Hardin, moving northeast at 30 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * Locations impacted include... Custer, Bighorn and Pompeys Pillar. |
| Alert: | Severe Thunderstorm Warning |
| Area(s): | Garfield, MT |
| Effective: | 2026-07-15 @ 12:30 am -> 2026-07-15 @ 1:00 am |
| Onset: | 2026-07-15 @ 12:30 am -> 2026-07-15 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Immediate |
| Issued By: | NWS Glasgow MT on 2026-07-15 @ 12:30 am |
| Headline: | Severe Thunderstorm Warning issued July 14 at 11:30PM MDT until July 15 at 12:00AM MDT by NWS Glasgow MT |
| Description: |
At 1130 PM MDT, severe thunderstorms were located along a line extending from 10 miles southeast of Devils Creek Rec Area to 10 miles southwest of Jordan to 20 miles southeast of Edwards, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Jordan, Sand Springs, Hell Creek Rec Area, Edwards, Brusett, and Steve Fork. |
| Alert: | Special Weather Statement |
| Area(s): | Musselshell; Treasure; Northern Rosebud; Northern Big Horn; Northeastern Yellowstone |
| Effective: | 2026-07-15 @ 12:23 am -> 2026-07-15 @ 1:30 am |
| Onset: | 2026-07-15 @ 12:23 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 12:23 am |
| Headline: | Special Weather Statement issued July 14 at 11:23PM MDT by NWS Billings MT |
| Description: |
At 1123 PM MDT, Doppler radar was tracking a line of strong thunderstorms extending from 39 miles north of Hysham to 24 miles north of Busby, or extending from 39 miles north of Hysham to 24 miles west of Colstrip, moving east at 20 mph. HAZARD...Wind gusts up to 50 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... Hardin, Forsyth, Hysham, Custer, Melstone, Bighorn, Ingomar, Vananda, Pompeys Pillar and Northern Cheyenne Indian Reservation. |
| Alert: | Extreme Heat Warning |
| Area(s): | Custer; Fallon; Powder River; Carter |
| Effective: | 2026-07-15 @ 12:01 am -> 2026-07-16 @ 12:15 am |
| Onset: | 2026-07-15 @ 12:01 am -> 2026-07-16 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-15 @ 12:01 am |
| Headline: | Extreme Heat Warning issued July 14 at 11:01PM 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 Wednesday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Very warm nighttime temperatures will provide only limited relief. |
| Alert: | Severe Thunderstorm Watch |
| Area(s): | Musselshell, MT; Rosebud, MT; Treasure, MT |
| Effective: | 2026-07-14 @ 11:16 pm -> 2026-07-15 @ 2:00 am |
| Onset: | 2026-07-14 @ 11:16 pm -> 2026-07-15 @ 2:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-14 @ 11:16 pm |
| Headline: | Severe Thunderstorm Watch issued July 14 at 10:16PM MDT until July 15 at 1:00AM MDT by NWS Billings MT |
| Description: |
SEVERE THUNDERSTORM WATCH 488 REMAINS VALID UNTIL 1 AM MDT WEDNESDAY FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 3 COUNTIES IN CENTRAL MONTANA MUSSELSHELL IN SOUTHEAST MONTANA ROSEBUD TREASURE THIS INCLUDES THE CITIES OF ASHLAND, COLSTRIP, FORSYTH, HYSHAM, LAME DEER, AND ROUNDUP. |
| Alert: | Flash Flood Warning |
| Area(s): | Petroleum, MT |
| Effective: | 2026-07-14 @ 10:33 pm -> 2026-07-15 @ 1:30 am |
| Onset: | 2026-07-14 @ 10:33 pm -> 2026-07-15 @ 1:30 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Immediate |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 10:33 pm |
| Headline: | Flash Flood Warning issued July 14 at 9:33PM MDT until July 15 at 12:30AM MDT by NWS Glasgow MT |
| Description: |
FFWGGW The National Weather Service in Glasgow has issued a * Flash Flood Warning for... Southwestern Petroleum County in northeastern Montana... * Until 1230 AM MDT. * At 933 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 2 inches of rain have fallen. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Winnett, Flatwillow, Tiegen and Petrolia Lake. US 87 in the southwest corner of Petroleum County including where it crosses Flatwillow Creek is expected to have flash flooding. |
| Alert: | Severe Thunderstorm Watch |
| Area(s): | Garfield, MT; McCone, MT; Petroleum, MT; Phillips, MT; Prairie, MT; Valley, MT |
| Effective: | 2026-07-14 @ 6:45 pm -> 2026-07-15 @ 2:00 am |
| Onset: | 2026-07-14 @ 6:45 pm -> 2026-07-15 @ 2:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 6:45 pm |
| Headline: | Severe Thunderstorm Watch issued July 14 at 5:45PM MDT until July 15 at 1:00AM MDT by NWS Glasgow MT |
| Description: |
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 488 IN EFFECT UNTIL 1 AM MDT WEDNESDAY FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 6 COUNTIES IN NORTHEAST MONTANA GARFIELD MCCONE PETROLEUM PHILLIPS PRAIRIE VALLEY THIS INCLUDES THE CITIES OF CIRCLE, FORT PECK, GLASGOW, JORDAN, MALTA, OPHEIM, SACO, TERRY, WHITEWATER, WINNETT, AND ZORTMAN. |
| Alert: | Flood Watch |
| Area(s): | Judith Gap; Crazy Mountains; Southern Wheatland |
| Effective: | 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 4:00 am |
| Onset: | 2026-07-14 @ 4:00 pm -> 2026-07-15 @ 4:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-14 @ 3:06 pm |
| Headline: | Flood Watch issued July 14 at 2:06PM MDT until July 15 at 3:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flash flooding caused by excessive rainfall from thunderstorms is 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. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, 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: | Flood Watch |
| Area(s): | Musselshell; Northern Stillwater; Golden Valley; Northern Sweet Grass; Melville Foothills; Northeastern Yellowstone; Southwestern Yellowstone |
| Effective: | 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 3:15 pm |
| Onset: | 2026-07-14 @ 4:00 pm -> 2026-07-15 @ 4:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-14 @ 3:06 pm |
| Headline: | Flood Watch issued July 14 at 2:06PM MDT until July 15 at 3:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flash flooding caused by excessive rainfall from thunderstorms is possible. * WHERE...Portions of central and south central Montana, including the following areas, in central Montana, Golden Valley and Musselshell. In south central Montana, Melville Foothills, Northeastern Yellowstone, Northern Stillwater, Northern Sweet Grass and Southwestern Yellowstone. * WHEN...From Wednesday afternoon through late Wednesday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, 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: | Flood Watch |
| Area(s): | Red Lodge Foothills; Northern Big Horn; Paradise Valley; Livingston Area; Beartooth Foothills; Absaroka/Beartooth Mountains; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains; Sheridan Foothills |
| Effective: | 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 3:15 pm |
| Onset: | 2026-07-15 @ 1:00 pm -> 2026-07-16 @ 4:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-14 @ 3:06 pm |
| Headline: | Flood Watch issued July 14 at 2:06PM 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 is greatest for recent area burn scars including the Robertson Draw and East Side Fires in Montana, and the Elk Fire in Wyoming. * WHERE...Portions of south central Montana, including the following areas, Absaroka/Beartooth Mountains, Beartooth Foothills, Bighorn Canyon, Livingston Area, Northern Big Horn, Northern Carbon, Paradise Valley, Pryor/Northern Bighorn Mountains, Red Lodge Foothills, Southeastern Carbon and Southern Big Horn and north central Wyoming, including the following areas, Northeast Bighorn Mountains and Sheridan Foothills. * WHEN...From Wednesday afternoon through late Wednesday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, 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: | Flood Watch |
| Area(s): | Musselshell; Northern Stillwater; Golden Valley; Northern Sweet Grass; Melville Foothills; Northeastern Yellowstone; Southwestern Yellowstone |
| Effective: | 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 3:15 pm |
| Onset: | 2026-07-15 @ 1:00 pm -> 2026-07-16 @ 4:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-07-14 @ 3:06 pm |
| Headline: | Flood Watch issued July 14 at 2:06PM MDT until July 16 at 3:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flash flooding caused by excessive rainfall from thunderstorms is possible. * WHERE...Portions of central and south central Montana, including the following areas, in central Montana, Golden Valley and Musselshell. In south central Montana, Melville Foothills, Northeastern Yellowstone, Northern Stillwater, Northern Sweet Grass and Southwestern Yellowstone. * WHEN...From Wednesday afternoon through late Wednesday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, 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: | Flood Watch |
| Area(s): | Central and Southeast Phillips; Petroleum; Southwest Phillips |
| Effective: | 2026-07-14 @ 2:41 pm -> 2026-07-15 @ 7:00 am |
| Onset: | 2026-07-14 @ 10:00 pm -> 2026-07-15 @ 7:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 2:41 pm |
| Headline: | Flood Watch issued July 14 at 1:41PM MDT until July 15 at 6:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northeast Montana, including the following areas, Central and Southeast Phillips, Petroleum and Southwest Phillips. * WHEN...From 9 PM MDT this evening through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - - Thunderstorms will be moving east into the Watch area, with the potential of heavy downpours that would bring flooding. - http://www.weather.gov/safety/flood |
| Alert: | Heat Advisory |
| Area(s): | Western Roosevelt; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt |
| Effective: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 3:00 am |
| Onset: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 3:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 2:38 pm |
| Headline: | Heat Advisory issued July 14 at 1:38PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Heat index values up to 94. * WHERE...Eastern Roosevelt, Northern Phillips, Northern Valley, Southwest Phillips, and Western Roosevelt Counties. * WHEN...Until 2 AM MDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Heat Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 8:00 am |
| Onset: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 3:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 2:38 pm |
| Headline: | Heat Advisory issued July 14 at 1:38PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Heat Advisory, heat index values up to 100. For the Lake Wind Advisory, northeast winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...For the Heat Advisory, until 2 AM MDT Wednesday. For the Lake Wind Advisory, until noon MDT Wednesday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 8:00 am |
| Onset: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 2:38 pm |
| Headline: | Lake Wind Advisory issued July 14 at 1:38PM MDT until July 15 at 12:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Heat Advisory, heat index values up to 100. For the Lake Wind Advisory, northeast winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...For the Heat Advisory, until 2 AM MDT Wednesday. For the Lake Wind Advisory, until noon MDT Wednesday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Extreme Heat Warning |
| Area(s): | Richland; Dawson; Prairie; Wibaux |
| Effective: | 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 8:00 am |
| Onset: | 2026-07-14 @ 2:38 pm -> 2026-07-16 @ 3:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-14 @ 2:38 pm |
| Headline: | Extreme Heat Warning issued July 14 at 1:38PM MDT until July 16 at 2:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with heat index values up to 104. * 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. |