Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Fire Weather Watch
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 @ 1:31 am -> 2026-07-23 @ 6:30 pm
Onset: 2026-07-24 @ 11:00 am -> 2026-07-25 @ 10:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-23 @ 1:31 am
Headline: Fire Weather Watch issued July 23 at 12:31AM MDT until July 25 at 9:00PM MDT by NWS Great Falls MT
Description: The National Weather Service in Great Falls has issued a Fire
Weather Watch for hot temperatures, gusty winds, and low relative
humidity, which is in effect from Friday morning through Saturday
evening.

* 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...Westerly 10 to 20 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 10 to 15 percent.

* TEMPERATURES...Mostly 90s and 100s.

* 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: Extreme Heat Watch
Area(s): Western and Central Chouteau County; Cascade County below 5000ft; Judith Basin County and Judith Gap
Effective: 2026-07-23 @ 12:53 am -> 2026-07-23 @ 6:00 pm
Onset: 2026-07-24 @ 11:00 am -> 2026-07-26 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-23 @ 12:53 am
Headline: Extreme Heat Watch issued July 22 at 11:53PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Dangerously hot conditions with afternoon temperatures 95 to
105 degrees possible.

* WHERE...Cascade County below 5000ft, Judith Basin County and Judith
Gap, and Western and Central Chouteau County.

* WHEN...From Friday morning through Sunday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.

* ADDITIONAL DETAILS...The most intense heat is expected Friday and
Saturday.

Alert: Extreme Heat Watch
Area(s): Hill County; Northern Blaine County; Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft
Effective: 2026-07-23 @ 12:53 am -> 2026-07-23 @ 6:00 pm
Onset: 2026-07-24 @ 11:00 am -> 2026-07-26 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-23 @ 12:53 am
Headline: Extreme Heat Watch issued July 22 at 11:53PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Dangerously hot conditions with afternoon temperatures 95 to
110 degrees possible.

* WHERE...Bears Paw Mountains and Southern Blaine, Fergus County
below 4500ft, Hill County, and Northern Blaine County.

* WHEN...From Friday morning through Sunday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.

* ADDITIONAL DETAILS...The most intense heat is expected Friday and
Saturday.

Alert: Extreme Heat Watch
Area(s): Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Rosebud; Judith Gap; Beartooth Foothills; Southern Big Horn; Southeastern Carbon; Northern Sweet Grass; Bighorn Canyon; Northern Carbon; Melville Foothills; Northeastern Yellowstone; Southern Wheatland; Southwestern Yellowstone; Sheridan Foothills
Effective: 2026-07-22 @ 11:51 pm -> 2026-07-24 @ 12:00 am
Onset: 2026-07-24 @ 10:00 am -> 2026-07-26 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Billings MT on 2026-07-22 @ 11:51 pm
Headline: Extreme Heat Watch issued July 22 at 10:51PM MDT until July 26 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with temperatures 95 to 110
possible.

* WHERE...Portions of central, south central, and southeast Montana
and north central Wyoming.

* WHEN...From Friday morning through Sunday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

Alert: Flood Watch
Area(s): Red Lodge Foothills; 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: 2026-07-22 @ 4:16 pm -> 2026-07-23 @ 3:00 am
Onset: 2026-07-22 @ 4:16 pm -> 2026-07-23 @ 3:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-22 @ 4:16 pm
Headline: Flood Watch issued July 22 at 3:16PM MDT until July 23 at 2:00AM MDT by NWS Billings MT
Description: The combination of a moist and unstable air mass with slow moving
thunderstorms capable of producing very heavy rain, will bring a risk
of flash flooding late this afternoon and evening.

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of south central Montana, including the following
areas, Absaroka/Beartooth Mountains, Beartooth Foothills, Bighorn
Canyon, Livingston Area, 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...Until 2 AM MDT Thursday.

* IMPACTS...Excessive runoff may result in flooding of rivers,
streams, and other low-lying and flood-prone locations. Recent burn
scars, including the Robertson Draw and East Side south of Red
Lodge, and the Elk along the eastern slopes of the Bighorn
Mountains, are at risk of experiencing flash flooding and debris
flows.

* ADDITIONAL DETAILS...
- Thunderstorms capable of producing very heavy rain are expected
late this afternoon and evening. These storms may cause localized
flash flooding.
- http://www.weather.gov/safety/flood

Alert: Fire Weather Watch
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: 2026-07-22 @ 12:51 pm -> 2026-07-23 @ 7:00 am
Onset: 2026-07-24 @ 11:00 am -> 2026-07-24 @ 10:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Glasgow MT on 2026-07-22 @ 12:51 pm
Headline: Fire Weather Watch issued July 22 at 11:51AM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT
Description: The National Weather Service in Glasgow has issued a Fire Weather
Watch, which is in effect from Friday morning through Friday
evening.

* AFFECTED AREA...Fire weather zones 122, 134, 135, 136, and
137.

* 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: Extreme Heat Watch
Area(s): Central and Southeast Phillips; Central and Southern Valley; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2026-07-22 @ 11:03 am -> 2026-07-23 @ 4:00 pm
Onset: 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Glasgow MT on 2026-07-22 @ 11:03 am
Headline: Extreme Heat Watch issued July 22 at 10:03AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 101
possible.

* WHERE...A portion of northeast Montana.

* WHEN...From Friday morning through Sunday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.