Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Winter Weather Advisory
Area(s): East Glacier Park Region; Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass; Elkhorn and Boulder Mountains
Effective: 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-17 @ 12:51 pm
Headline: Winter Weather Advisory issued May 17 at 11:51AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow. Additional snow accumulations up to two inches. Winds
gusting as high as 40 mph.

* WHERE...The Continental Divide along the Rocky Mountain Front,
Upper Blackfoot and MacDonald Pass, and Elkhorn and Boulder
Mountains.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Plan on slippery backcountry road conditions. Wet and
raw conditions may create hypothermia risk for those recreating in
the backcountry.

Alert: Winter Weather Advisory
Area(s): Little Belt and Highwood Mountains; Big Belt, Bridger and Castle Mountains
Effective: 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-17 @ 12:51 pm
Headline: Winter Weather Advisory issued May 17 at 11:51AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow. Additional snow accumulations up to two inches. Winds
gusting as high as 40 mph.

* WHERE...Big Belt, Bridger and Castle Mountains and Little Belt and
Highwood Mountains.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Plan on slippery backcountry road conditions. Wet and
raw conditions may create hypothermia risk for those recreating in
the backcountry.

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-05-17 @ 12:46 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 12:46 pm -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-05-17 @ 12:46 pm
Headline: Lake Wind Advisory issued May 17 at 11:46AM MDT until May 18 at 12:00AM MDT by NWS Glasgow MT
Description: * WHAT...Northwest winds 15 to 25 mph with gusts up to 40 mph.

* WHERE...Fort Peck Lake.

* WHEN...Until midnight MDT tonight.

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

Alert: Winter Weather Advisory
Area(s): Red Lodge Foothills; Beartooth Foothills
Effective: 2026-05-17 @ 11:42 am -> 2026-05-18 @ 11:45 am
Onset: 2026-05-17 @ 7:00 pm -> 2026-05-18 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-05-17 @ 11:42 am
Headline: Winter Weather Advisory issued May 17 at 10:42AM MDT until May 18 at 12:00PM MDT by NWS Billings MT
Description: * WHAT...Snow and blowing snow expected. Total snow accumulations 1
to 3 inches, with locally heavier accumulations close to the higher
terrain. Winds gusting as high as 35 mph.

* WHERE...Beartooth Foothills and Red Lodge Foothills.

* WHEN...From 6 PM this evening to noon MDT Monday.

* IMPACTS...Plan on difficult driving conditions due to poor
visibility and slick roads. The hazardous conditions will impact
the Monday morning commute.

* ADDITIONAL DETAILS...The greatest snow accumulations will occur
along the higher foothills near the mountains above 5000 feet.

Alert: Winter Weather Advisory
Area(s): Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains
Effective: 2026-05-17 @ 11:42 am -> 2026-05-18 @ 11:45 am
Onset: 2026-05-17 @ 7:00 pm -> 2026-05-18 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-05-17 @ 11:42 am
Headline: Winter Weather Advisory issued May 17 at 10:42AM MDT until May 18 at 12:00PM MDT by NWS Billings MT
Description: * WHAT...Snow and blowing snow expected. Total snow accumulations
between 4 and 10 inches. Winds gusting as high as 45 mph.

* WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming,
Northeast Bighorn Mountains.

* WHEN...From 6 PM this evening to noon MDT Monday.

* IMPACTS...Snow and blowing snow will impact back country recreation
and travel along Highway 14 through the Bighorn Mountains.

* ADDITIONAL DETAILS...Back country activities will be impacted by
difficult winter conditions.

Alert: Frost Advisory
Area(s): Flathead/Mission Valleys; Missoula/Bitterroot Valleys
Effective: 2026-05-17 @ 10:04 am -> 2026-05-18 @ 10:00 am
Onset: 2026-05-17 @ 9:00 pm -> 2026-05-18 @ 10:00 am
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-17 @ 10:04 am
Headline: Frost Advisory issued May 17 at 9:04AM MDT until May 18 at 9:00AM MDT by NWS Missoula MT
Description: * WHAT...Temperatures as low as 29 will result in frost formation.

* WHERE...Flathead/Mission Valleys and Missoula/Bitterroot Valleys.

* WHEN...From 8 PM this evening to 9 AM MDT Monday.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.

Alert: Winter Weather Advisory
Area(s): Bitterroot/Sapphire Mountains; Butte/Blackfoot Region
Effective: 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-17 @ 9:50 am
Headline: Winter Weather Advisory issued May 17 at 8:50AM MDT until May 18 at 12:00AM MDT by NWS Missoula MT
Description: * WHAT...Snow expected. Total snow accumulations of 2 to 6 inches in
the mountain terrain above 5000 feet. Accumulations up to 10 inches
above 6,000 ft. Slushy accumulations possible for Lost Trail,
Homestake and MacDonald Passes and around Georgetown Lake. Winds
gusting as high as 35 mph.

* WHERE...Highway 93 Sula to Lost Trail Pass, Homestake Pass,
Georgetown Lake, MacDonald Pass, Butte, and Lolo Pass.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Plan on slippery backcountry road conditions. Cold, wet
and breezy conditions may create hypothermia risk for those
recreating in the backcountry.

Alert: Winter Weather Advisory
Area(s): West Glacier Region; Potomac/Seeley Lake Region
Effective: 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-17 @ 9:50 am
Headline: Winter Weather Advisory issued May 17 at 8:50AM MDT until May 18 at 12:00AM MDT by NWS Missoula MT
Description: * WHAT...Snow expected. Total snow accumulations of 2 to 6 inches in
the mountain terrain above 5000 feet. Accumulations up to 10
inches above 6,000 ft. Slushy accumulations possible on Marias
Pass.

* WHERE...The higher terrain of Glacier National Park.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Plan on slippery backcountry road conditions. Cold, wet
and breezy conditions may create hypothermia risk for those
recreating in the backcountry.