Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Winter Weather Advisory
Area(s): Gallatin and Madison County Mountains and Centennial Mountains
Effective: 2026-05-16 @ 12:00 am -> 2026-05-16 @ 3:00 pm
Onset: 2026-05-16 @ 6:00 pm -> 2026-05-17 @ 7:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-16 @ 12:00 am
Headline: Winter Weather Advisory issued May 15 at 11:00PM MDT until May 17 at 6:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow expected. Total snow accumulations 3 to 7 inches, with
higher amounts on high peaks. Winds gusting as high as 40 mph.

* WHERE...Gallatin and Madison County Mountains and Centennial
Mountains.

* WHEN...From 5 PM Saturday to 6 AM MDT Sunday.

* IMPACTS...Plan on slippery and slushy road conditions and raw back
country conditions Saturday evening into Sunday.

* ADDITIONAL DETAILS...Snow levels quickly fall Saturday evening
after a round of showers and perhaps a couple thunderstorms
Saturday afternoon. Those with back country plans should be aware
of the forecast raw conditions.

Alert: Winter Weather Advisory
Area(s): Little Belt and Highwood Mountains; Big Belt, Bridger and Castle Mountains
Effective: 2026-05-16 @ 12:00 am -> 2026-05-16 @ 3:00 pm
Onset: 2026-05-17 @ 1:00 am -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-16 @ 12:00 am
Headline: Winter Weather Advisory issued May 15 at 11:00PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow expected. Total snow accumulations between 3 and 8
inches, with isolated amounts up to 12 inches in the northern
slopes of the Little Belt Mountains. Winds gusting as high as 40
mph.

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

* WHEN...From midnight Saturday Night to midnight MDT Sunday Night.

* 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): East Glacier Park Region; Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass; Elkhorn and Boulder Mountains
Effective: 2026-05-16 @ 12:00 am -> 2026-05-16 @ 3:00 pm
Onset: 2026-05-17 @ 1:00 am -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-16 @ 12:00 am
Headline: Winter Weather Advisory issued May 15 at 11:00PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Snow expected. Total snow accumulations between 2 and 6
inches over most mountain passes, with up to 12 inches over the
highest peaks. 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...From midnight Saturday Night to midnight MDT Sunday Night.

* 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): Bitterroot/Sapphire Mountains; Butte/Blackfoot Region
Effective: 2026-05-15 @ 12:38 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 1:00 am -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-15 @ 12:38 pm
Headline: Winter Weather Advisory issued May 15 at 11:38AM 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. Slushy accumulations
possible for Lost Trail, Homestake and MacDonald Passes and around
Georgetown Lake. Winds gusting as high as 35 mph.

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

* WHEN...From midnight Saturday Night to midnight MDT Sunday Night.

* 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: 2026-05-15 @ 12:38 pm -> 2026-05-18 @ 1:00 am
Onset: 2026-05-17 @ 1:00 am -> 2026-05-18 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-15 @ 12:38 pm
Headline: Winter Weather Advisory issued May 15 at 11:38AM 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. Slushy accumulations
possible on Marias Pass.

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

* WHEN...From midnight Saturday Night to midnight MDT Sunday Night.

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