Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Flood Advisory
Area(s): Carter, MT
Effective: 2026-07-23 @ 5:22 pm -> 2026-07-23 @ 8:15 pm
Onset: 2026-07-23 @ 5:22 pm -> 2026-07-23 @ 8:15 pm
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-23 @ 5:22 pm
Headline: Flood Advisory issued July 23 at 4:22PM MDT until July 23 at 7:15PM MDT by NWS Billings MT
Description: * WHAT...Flooding caused by excessive rainfall is expected.

* WHERE...South Central Carter County in southeastern Montana...

* WHEN...Until 715 PM MDT.

* IMPACTS...Flooding in low-lying and poor drainage areas. Rises in
streams and rivers.

* ADDITIONAL DETAILS...
- At 419 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 inches of rain have
fallen.
- Some locations that will experience flooding include...
Mainly rural areas of South Central Carter County.
- http://www.weather.gov/safety/flood

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 1:00 pm -> 2026-07-24 @ 7:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-23 @ 3:05 pm
Headline: Lake Wind Advisory issued July 23 at 2:05PM MDT until July 24 at 6:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 106 expected. For the Lake Wind
Advisory, west winds 10 to 15 mph with gusts up to 30 mph expected.

* WHERE...Central and Southeast Phillips, Central and Southern
Valley, Garfield, McCone, and Petroleum Counties.

* WHEN...For the Extreme Heat Warning, from 10 AM Friday to 10 PM MDT
Sunday. For the Lake Wind Advisory, from noon to 6 PM MDT Friday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft. Heat related illnesses
increase significantly during extreme heat and high humidity
events.

Alert: Extreme Heat Warning
Area(s): Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Southwest Phillips; Eastern Roosevelt
Effective: 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-23 @ 3:05 pm
Headline: Extreme Heat Warning issued July 23 at 2:05PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 108
expected.

* WHERE...Dawson, Eastern Roosevelt, Prairie, Richland, Southwest
Phillips, Western Roosevelt, and Wibaux Counties.

* WHEN...From 10 AM Friday to 10 PM MDT Sunday.

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

Alert: Heat Advisory
Area(s): Northern Phillips; Northern Valley
Effective: 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-23 @ 3:05 pm
Headline: Heat Advisory issued July 23 at 2:05PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Heat index values up to 105 expected.

* WHERE...Northern Phillips and Northern Valley Counties.

* WHEN...From 10 AM Friday to 10 PM MDT Sunday.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.

Alert: Extreme Heat Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-23 @ 3:05 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 11:00 am -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-23 @ 3:05 pm
Headline: Extreme Heat Warning issued July 23 at 2:05PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 106 expected. For the Lake Wind
Advisory, west winds 10 to 15 mph with gusts up to 30 mph expected.

* WHERE...Central and Southeast Phillips, Central and Southern
Valley, Garfield, McCone, and Petroleum Counties.

* WHEN...For the Extreme Heat Warning, from 10 AM Friday to 10 PM MDT
Sunday. For the Lake Wind Advisory, from noon to 6 PM MDT Friday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft. Heat related illnesses
increase significantly during extreme heat and high humidity
events.

Alert: Red Flag Warning
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 @ 2:57 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 11:00 am -> 2026-07-25 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-23 @ 2:57 pm
Headline: Red Flag Warning issued July 23 at 1:57PM MDT until July 25 at 9:00PM MDT by NWS Great Falls MT
Description: The National Weather Service in Great Falls has issued a Red Flag
Warning for hot temperatures, gusty winds, and low relative
humidity, which is in effect from 10 AM Friday to 9 PM MDT
Saturday. The Fire Weather Watch is no longer in effect.

* 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...Southwest 15 to 25 mph, with gusts up to 40 mph.

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

* TEMPERATURES...Near 100 on Friday and up to 105 on Saturday.

* 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: Fire Weather Watch
Area(s): Gallatin National Forest; Wheatland County/Sweet Grass County; Stillwater County; Beartooth Ranger District Custer National Forest; Golden Valley County/Musselshell County; Yellowstone County; Crow Indian Reservation/Big Horn Canyon Rec Area; Northern Rosebud/Northern Treasure Counties; Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM; Bighorn National Forest
Effective: 2026-07-23 @ 2:13 pm -> 2026-07-24 @ 2:15 pm
Onset: 2026-07-25 @ 1:00 pm -> 2026-07-26 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-23 @ 2:13 pm
Headline: Fire Weather Watch issued July 23 at 1:13PM MDT until July 26 at 12:00AM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Fire Weather
Watch...which is in effect from Saturday afternoon through
Saturday evening.

* IMPACTS: Low humidities, hot temperatures, and high-based
thunderstorms with gusty and erratic outflow winds may create
erratic fire behavior and new fire starts.

* AFFECTED AREA:
In North Central WY Fire Zones...274...284.
In South Central MT Fire Zones...123...124...125...126...127
128...129.
In Southeast MT Fire Zones...130...131...132.
In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED:
In Central MT...Golden Valley...Musselshell...Wheatland.
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In Northwest SD...Harding.
In South Central MT...Big Horn...Carbon...Park...Stillwater
Sweet Grass...Yellowstone.
In Southeast MT...Carter...Custer...Fallon...Powder River
Rosebud...Treasure.
In Southwest MT...Gallatin.

* WIND: Southwest 10 to 20 mph with gusts to 25 mph.

* THUNDERSTORMS: Scattered afternoon and evening thunderstorms will
produce gusty and erratic winds, and spotty rainfall.

* HUMIDITY: Minimums of 12 to 19 percent.

* TEMPERATURES: Highs of 99 to 107 below 5000 feet, hottest in the
east.

Alert: Extreme Heat Warning
Area(s): Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Golden Valley; Northern Big Horn; Southern Rosebud; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills
Effective: 2026-07-23 @ 1:52 pm -> 2026-07-24 @ 2:00 pm
Onset: 2026-07-24 @ 10:00 am -> 2026-07-26 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-23 @ 1:52 pm
Headline: Extreme Heat Warning issued July 23 at 12:52PM MDT until July 26 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with high temperatures of 100 to
108, hottest in the east. Saturday is expected to be the hottest
day.

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

* WHEN...From 9 AM Friday to 9 PM MDT Sunday.

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

* ADDITIONAL DETAILS...Very warm nighttime temperatures will provide
only limited relief.

Alert: Heat Advisory
Area(s): Northern Park; Paradise Valley; Livingston Area
Effective: 2026-07-23 @ 1:52 pm -> 2026-07-24 @ 2:00 pm
Onset: 2026-07-24 @ 10:00 am -> 2026-07-26 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-23 @ 1:52 pm
Headline: Heat Advisory issued July 23 at 12:52PM MDT until July 26 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...Hot conditions with high temperatures of 94 to 101.

* WHERE...Livingston Area, Northern Park, and Paradise Valley.

* WHEN...From 9 AM Friday to 9 PM MDT Sunday.

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

* ADDITIONAL DETAILS...Warm nighttime temperatures will provide
limited relief.

Alert: Heat Advisory
Area(s): Red Lodge Foothills; Judith Gap; Beartooth Foothills; Northern Sweet Grass; Melville Foothills; Southern Wheatland
Effective: 2026-07-23 @ 1:52 pm -> 2026-07-24 @ 2:00 pm
Onset: 2026-07-24 @ 10:00 am -> 2026-07-26 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-23 @ 1:52 pm
Headline: Heat Advisory issued July 23 at 12:52PM MDT until July 26 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...Hot conditions with high temperatures of 95 to 102. Saturday
is expected to be the hottest day.

* WHERE...Portions of central and south central Montana.

* WHEN...From 9 AM Friday to 9 PM MDT Sunday.

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

* ADDITIONAL DETAILS...Warm nighttime temperatures will provide
limited relief.

Alert: Extreme Heat Warning
Area(s): Hill County; Northern Blaine County; 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
Effective: 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-25 @ 1:00 pm -> 2026-07-25 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-23 @ 1:51 pm
Headline: Extreme Heat Warning issued July 23 at 12:51PM MDT until July 25 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...For the first Heat Advisory through Saturday morning,
temperatures up to 101 F. For the Extreme Heat Warning Saturday
afternoon and evening, dangerously hot conditions with temperatures
up to 108 F. For the second Heat Advisory Saturday night into
Sunday, temperatures up to 101 F.

* WHERE...Bears Paw Mountains and Southern Blaine, Cascade County
below 5000ft, Fergus County below 4500ft, Hill County, Judith Basin
County and Judith Gap, Northern Blaine County, and Western and
Central Chouteau County.

* WHEN...For the first Heat Advisory, from noon Friday to noon MDT
Saturday. For the Extreme Heat Warning, from noon to 9 PM MDT
Saturday. For the second Heat Advisory, from 9 PM Saturday to 9 PM
MDT Sunday.

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

Alert: Heat Advisory
Area(s): Hill County; Northern Blaine County; 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
Effective: 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 1:00 pm -> 2026-07-25 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-23 @ 1:51 pm
Headline: Heat Advisory issued July 23 at 12:51PM MDT until July 25 at 12:00PM MDT by NWS Great Falls MT
Description: * WHAT...For the first Heat Advisory through Saturday morning,
temperatures up to 101 F. For the Extreme Heat Warning Saturday
afternoon and evening, dangerously hot conditions with temperatures
up to 108 F. For the second Heat Advisory Saturday night into
Sunday, temperatures up to 101 F.

* WHERE...Bears Paw Mountains and Southern Blaine, Cascade County
below 5000ft, Fergus County below 4500ft, Hill County, Judith Basin
County and Judith Gap, Northern Blaine County, and Western and
Central Chouteau County.

* WHEN...For the first Heat Advisory, from noon Friday to noon MDT
Saturday. For the Extreme Heat Warning, from noon to 9 PM MDT
Saturday. For the second Heat Advisory, from 9 PM Saturday to 9 PM
MDT Sunday.

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

Alert: Heat Advisory
Area(s): Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Eastern Pondera and Eastern Teton; Gates of the Mountains; Helena Valley; Meagher County Valleys; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Beaverhead and Western Madison below 6000ft
Effective: 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 1:00 pm -> 2026-07-26 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-23 @ 1:51 pm
Headline: Heat Advisory issued July 23 at 12:51PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...High temperatures up to 100F expected.

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

* WHEN...From noon Friday to 9 PM MDT Sunday.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.

Alert: Heat Advisory
Area(s): Hill County; Northern Blaine County; 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
Effective: 2026-07-23 @ 1:51 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-25 @ 10:00 pm -> 2026-07-26 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-23 @ 1:51 pm
Headline: Heat Advisory issued July 23 at 12:51PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...For the first Heat Advisory through Saturday morning,
temperatures up to 101 F. For the Extreme Heat Warning Saturday
afternoon and evening, dangerously hot conditions with temperatures
up to 108 F. For the second Heat Advisory Saturday night into
Sunday, temperatures up to 101 F.

* WHERE...Bears Paw Mountains and Southern Blaine, Cascade County
below 5000ft, Fergus County below 4500ft, Hill County, Judith Basin
County and Judith Gap, Northern Blaine County, and Western and
Central Chouteau County.

* WHEN...For the first Heat Advisory, from noon Friday to noon MDT
Saturday. For the Extreme Heat Warning, from noon to 9 PM MDT
Saturday. For the second Heat Advisory, from 9 PM Saturday to 9 PM
MDT Sunday.

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

Alert: Red Flag Warning
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 @ 1:15 pm -> 2026-07-24 @ 7:00 am
Onset: 2026-07-24 @ 11:00 am -> 2026-07-24 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-23 @ 1:15 pm
Headline: Red Flag Warning issued July 23 at 12:15PM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT
Description: The National Weather Service in Glasgow has issued a Red Flag
Warning, which is in effect from 10 AM to 9 PM MDT Friday. The
Fire Weather Watch is no longer in effect.

* 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.