Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Winter Weather Advisory
Area(s): Red Lodge Foothills; Beartooth Foothills
Effective: 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm
Onset: 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-05-17 @ 7:46 pm
Headline: Winter Weather Advisory issued May 17 at 6:46PM MDT until May 18 at 12:00PM MDT by NWS Billings MT
Description: * WHAT...Snow and blowing snow. Total snow accumulations up to 3
inches, greatest near the higher terrain. Winds gusting as high as
35 mph.

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

* WHEN...Until noon MDT Monday.

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

* ADDITIONAL DETAILS...Locally heavier snowfall is possible in the
foothills above 6000 feet. Snow accumulations will decrease away
from the mountains and foothills.

Alert: Winter Weather Advisory
Area(s): Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains
Effective: 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm
Onset: 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-05-17 @ 7:46 pm
Headline: Winter Weather Advisory issued May 17 at 6:46PM MDT until May 18 at 12:00PM MDT by NWS Billings MT
Description: * WHAT...Snow and blowing snow. Total snow accumulations between 4
and 8 inches, greatest in the Bighorn Mountains. Winds gusting as
high as 45 mph.

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

* WHEN...Until noon MDT Monday.

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

Alert: Winter Weather Advisory
Area(s): Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass
Effective: 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-17 @ 7:17 pm
Headline: Winter Weather Advisory issued May 17 at 6:17PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow. Additional snow accumulations of 1 to 2 inches.

* WHERE...Upper Blackfoot and MacDonald Pass and Southern Rocky
Mountain Front.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Plan on slippery road conditions.

Alert: Winter Weather Advisory
Area(s): Little Belt and Highwood Mountains
Effective: 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-17 @ 7:17 pm
Headline: Winter Weather Advisory issued May 17 at 6:17PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow. Additional snow accumulations of 1 to 2 inches.

* WHERE...Little Belt and Highwood Mountains.

* WHEN...Until midnight MDT tonight.

* IMPACTS...Plan on slippery road conditions.

Alert: Frost Advisory
Area(s): Kootenai/Cabinet Region
Effective: 2026-05-17 @ 6:01 pm -> 2026-05-18 @ 9:00 am
Onset: 2026-05-18 @ 1:00 am -> 2026-05-18 @ 9:00 am
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-17 @ 6:01 pm
Headline: Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 8:00AM MDT by NWS Missoula MT
Description: * WHAT...Temperatures between 25 and 34 degrees will result in frost
formation.

* WHERE...Kootenai/Cabinet Region.

* WHEN...From midnight tonight to 8 AM MDT Monday.

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

* ADDITIONAL DETAILS...Temperature ranges include: 31 to 35 degrees
in Eureka, 25 to 28 in Olney, 32 to 36 Libby and Troy areas, 30 to
35 south of Libby to Happys Inn and 26 to 31 Marion and Yaak areas.

Alert: Frost Advisory
Area(s): Lower Clark Fork Region
Effective: 2026-05-17 @ 6:01 pm -> 2026-05-18 @ 9:00 am
Onset: 2026-05-18 @ 1:00 am -> 2026-05-18 @ 9:00 am
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-17 @ 6:01 pm
Headline: Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 8:00AM MDT by NWS Missoula MT
Description: * WHAT...Temperatures between 25 and 34 degrees will result in frost
formation.

* WHERE...Lower Clark Fork Region.

* WHEN...From midnight tonight to 8 AM MDT Monday.

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

* ADDITIONAL DETAILS...Temperature ranges include:28 to 32 degrees in
Thompson Falls, 30 to 34 degrees in Plains, 33 to 37 degrees in
Noxon, 25 to 28 degrees in Haugan, 29 to 32 degrees in St. Regis,
and 29 to 34 degrees in Alberton.

Alert: Frost Advisory
Area(s): Flathead/Mission Valleys; Missoula/Bitterroot Valleys
Effective: 2026-05-17 @ 6:01 pm -> 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 @ 6:01 pm
Headline: Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 9:00AM MDT by NWS Missoula MT
Description: * WHAT...Temperatures as low as 28 degrees 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.

* ADDITIONAL DETAILS...Low-lying areas of the Bitterroot Valley could
fall between 24 and 28 degrees.

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): 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.