Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-09-03 @ 4:17 pm -> 2026-09-04 @ 1:00 pm
Onset: 2026-09-04 @ 7:00 am -> 2026-09-04 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-09-03 @ 4:17 pm
Headline: Lake Wind Advisory issued September 3 at 3:17PM MDT until September 4 at 12:00PM MDT by NWS Glasgow MT
Description: * WHAT...Southeast winds 15 to 20 mph with gusts up to 35 mph
expected.

* WHERE...Fort Peck Lake.

* WHEN...From 6 AM to noon MDT Friday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.

* ADDITIONAL DETAILS...Waves as high as 4 feet.

Alert: Red Flag Warning
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; Northern Rosebud/Northern Treasure Counties
Effective: 2026-09-03 @ 3:19 pm -> 2026-09-03 @ 10:00 pm
Onset: 2026-09-03 @ 3:19 pm -> 2026-09-03 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM MDT until September 3 at 9:00PM MDT by NWS Billings MT
Description: * IMPACTS: Low humidities, unseasonably warm temperatures, and
strong gusty winds will create erratic fire behavior.


* AFFECTED AREA:
In South Central MT Fire Zones...123...124...125...126...127
128.
In Southeast MT Fire Zone...130.

* COUNTIES AFFECTED:
In Central MT...Golden Valley...Musselshell...Wheatland.
In South Central MT...Carbon...Park...Stillwater...Sweet Grass
Yellowstone.
In Southeast MT...Rosebud...Treasure.
In Southwest MT...Gallatin.

* WIND: Southwest 10 to 20 mph with gusts up to 35 mph.

* HUMIDITY: As low as 14 percent.

* ADDITIONAL DETAILS: For Gallatin National Forest (MTZ123) and
Beartooth Ranger District (MTZ126), the worst conditions are
expected across the lower elevations.

Alert: Red Flag Warning
Area(s): Crow Indian Reservation/Big Horn Canyon Rec Area; Bighorn National Forest
Effective: 2026-09-03 @ 3:19 pm -> 2026-09-04 @ 3:30 pm
Onset: 2026-09-03 @ 3:19 pm -> 2026-09-03 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM MDT until September 3 at 9:00PM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from 9 AM to 9 PM MDT Friday.

* IMPACTS: Low humidities, unseasonably warm temperatures, and
strong gusty winds will create erratic fire behavior.

* AFFECTED AREA:
In North Central WY Fire Zone...284.
In South Central MT Fire Zone...129.

* COUNTIES AFFECTED:
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In South Central MT...Big Horn...Carbon...Yellowstone.

* WIND: South 10 to 20 mph with gusts 25 to 35 mph.

* HUMIDITY: As low as 10 percent.

* ADDITIONAL DETAILS: The worst conditions are expected across the
lower elevations.

* TEMPERATURES: Up to 96.

Alert: Red Flag Warning
Area(s): Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM
Effective: 2026-09-03 @ 3:19 pm -> 2026-09-04 @ 3:30 pm
Onset: 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM MDT until September 4 at 9:00PM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from 9 AM to 9 PM MDT Friday. The
Fire Weather Watch is no longer in effect.

* IMPACTS: Low humidities, unseasonably warm temperatures, and
strong gusty winds will create erratic fire behavior.


* AFFECTED AREA:
In North Central WY Fire Zone...274.
In Southeast MT Fire Zones...131...132.
In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED:
In North Central WY...Sheridan.
In Northwest SD...Harding.
In South Central MT...Big Horn.
In Southeast MT...Carter...Custer...Fallon...Powder River
Rosebud...Treasure.

* WIND: South 10 to 20 mph with gusts 25 to 35 mph.

* HUMIDITY: As low as 10 percent.

* TEMPERATURES: in the 90s.

Alert: Red Flag Warning
Area(s): Crow Indian Reservation/Big Horn Canyon Rec Area; Bighorn National Forest
Effective: 2026-09-03 @ 3:19 pm -> 2026-09-04 @ 3:30 pm
Onset: 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM MDT until September 4 at 9:00PM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from 9 AM to 9 PM MDT Friday.

* IMPACTS: Low humidities, unseasonably warm temperatures, and
strong gusty winds will create erratic fire behavior.

* AFFECTED AREA:
In North Central WY Fire Zone...284.
In South Central MT Fire Zone...129.

* COUNTIES AFFECTED:
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In South Central MT...Big Horn...Carbon...Yellowstone.

* WIND: South 10 to 20 mph with gusts 25 to 35 mph.

* HUMIDITY: As low as 10 percent.

* ADDITIONAL DETAILS: The worst conditions are expected across the
lower elevations.

* TEMPERATURES: Up to 96.