Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Heat Advisory
Area(s): Eastern Toole and Liberty; Hill County; Northern Blaine County; Southern High Plains; Eastern Pondera and Eastern Teton; 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; Gates of the Mountains; Helena Valley; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley
Effective: 2026-07-10 @ 4:11 am -> 2026-07-10 @ 6:00 pm
Onset: 2026-07-11 @ 1:00 pm -> 2026-07-13 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-10 @ 4:11 am
Headline: Heat Advisory issued July 10 at 3:11AM MDT until July 13 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Hot daytime temperatures of 95 to 105 degrees, with
overnight temperatures of 60 to 70 degrees expected.

* WHERE...Portions of central, north central, and southwest Montana.

* WHEN...From noon Saturday to 9 PM MDT Monday.

* IMPACTS...Hot temperatures may cause heat illnesses.

Alert: Extreme Heat Warning
Area(s): Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Northern Park; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Rosebud; Judith Gap; Paradise Valley; Livingston Area; 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: 2026-07-10 @ 1:49 am -> 2026-07-11 @ 2:00 am
Onset: 2026-07-11 @ 7:00 am -> 2026-07-14 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-10 @ 1:49 am
Headline: Extreme Heat Warning issued July 10 at 12:49AM MDT until July 14 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with high temperatures of 100 to
113 expected, hottest Sunday. Some all time record highs are
possible on Sunday.

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

* WHEN...From 6 AM Saturday to midnight MDT Monday Night.

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

* ADDITIONAL DETAILS...Extremely hot daytime temperatures combined
with warm overnight low temperatures will produce cumulative heat
stress. This heat stress will quickly become dangerous to anyone
without adequate cooling and hydration.

Alert: Extreme Heat Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2026-07-10 @ 1:30 am -> 2026-07-10 @ 5:00 pm
Onset: 2026-07-11 @ 7:00 am -> 2026-07-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-10 @ 1:30 am
Headline: Extreme Heat Warning issued July 10 at 12:30AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs between 93 and 103 on
Saturday and highs between 97 and 110 on Sunday expected.

* WHERE...All of northeast Montana.

* WHEN...From 6 AM Saturday to 6 AM MDT Monday.

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