Yellowstone National Park, Wyoming

Regional Weather Alerts


     

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: 2026-07-23 @ 5:09 am -> 2026-07-23 @ 6:00 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 2026-07-23 @ 5:09 am
Headline: Extreme Heat Watch issued July 23 at 4:09AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs up to 108 possible.

* WHERE...Most of northeast Montana.

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

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

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: 2026-07-23 @ 5:02 am -> 2026-07-23 @ 6:00 pm
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 2026-07-23 @ 5:02 am
Headline: Fire Weather Watch issued July 23 at 4:02AM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT
Description: * 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): 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: 2026-07-23 @ 3:37 am -> 2026-07-24 @ 3:45 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 2026-07-23 @ 3:37 am
Headline: Extreme Heat Watch issued July 23 at 2:37AM 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: 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.