Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Red Flag Warning
Area(s): Hill and Blaine Counties
Effective: 2026-05-12 @ 1:59 pm -> 2026-05-13 @ 10:00 pm
Onset: 2026-05-13 @ 1:00 pm -> 2026-05-13 @ 5:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-05-12 @ 1:59 pm
Headline: Red Flag Warning issued May 12 at 12:59PM MDT until May 13 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 noon to 9 PM MDT Wednesday. The
Fire Weather Watch is no longer in effect.

* AFFECTED AREA...Hill and Blaine Counties.

* TIMING...

* WINDS...South 20 to 35 mph with gusts up to 50 mph.

* RELATIVE HUMIDITY...As low as 14 percent.

* TEMPERATURES...Up to 90.

* LIGHTNING...

* IMPACTS...Any fires that develop will spread rapidly. Outdoor
burning is not recommended.

Alert: High Wind Watch
Area(s): Hill County; Northern Blaine County; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft; Snowy and Judith Mountains
Effective: 2026-05-12 @ 1:47 pm -> 2026-05-15 @ 1:00 am
Onset: 2026-05-14 @ 4:00 am -> 2026-05-13 @ 5:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-05-12 @ 1:47 pm
Headline: High Wind Watch issued May 12 at 12:47PM MDT until May 15 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...West winds 30 to 40 mph with gusts up to 65 mph possible.

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

* WHEN...From late Wednesday night through Thursday evening.

* IMPACTS...High winds may move loose debris, damage property and
cause isolated power outages. Travel could be difficult,
especially for high profile vehicles.

Alert: High Wind Watch
Area(s): East Glacier Park Region; Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Southern Rocky Mountain Front; Southern High Plains; Upper Blackfoot and MacDonald Pass
Effective: 2026-05-12 @ 1:47 pm -> 2026-05-15 @ 1:00 am
Onset: 2026-05-13 @ 7:00 pm -> 2026-05-13 @ 5:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-05-12 @ 1:47 pm
Headline: High Wind Watch issued May 12 at 12:47PM MDT until May 15 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...West winds 30 to 45 mph with gusts up to 75 mph possible
along the immediate eastern slopes of the Rocky Mountain Front,
with gusts up to 65 mph by Cut Bank and MacDonald Pass.

* WHERE...The Rocky Mountain Front and adjacent foothills and
plains, Eastern Glacier, Western Toole, and Central Pondera
Counties, and Upper Blackfoot and MacDonald Pass.

* WHEN...From Wednesday evening through Thursday evening.

* IMPACTS...High winds may move loose debris, damage property and
cause isolated power outages. Travel could be difficult,
especially for high profile vehicles.

Alert: High Wind Watch
Area(s): Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft; Ruby Mountains and Southern Beaverhead Mountains; Gallatin and Madison County Mountains and Centennial Mountains
Effective: 2026-05-12 @ 1:47 pm -> 2026-05-13 @ 10:00 pm
Onset: 2026-05-13 @ 1:00 pm -> 2026-05-13 @ 5:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-05-12 @ 1:47 pm
Headline: High Wind Watch issued May 12 at 12:47PM MDT until May 13 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Southwest winds 25 to 40 mph with gusts up to 60 mph
possible.

* WHERE...Southwestern Montana along and south of Interstate 90, and
Canyon Ferry Area.

* WHEN...From Wednesday afternoon through Wednesday evening.

* IMPACTS...High winds may move loose debris, damage property and
cause power outages. Travel could be difficult, especially for
high profile vehicles.

* ADDITIONAL DETAILS...Wednesday afternoon there will also be
isolated thunderstorms in these areas that will bring wind gusts
in excess of 60 mph.

Alert: High Wind Watch
Area(s): Eastern Toole and Liberty; Cascade County below 5000ft; Judith Basin County and Judith Gap; Helena Valley
Effective: 2026-05-12 @ 1:47 pm -> 2026-05-14 @ 7:00 pm
Onset: 2026-05-14 @ 1:00 am -> 2026-05-13 @ 5:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-05-12 @ 1:47 pm
Headline: High Wind Watch issued May 12 at 12:47PM MDT until May 14 at 6:00PM MDT by NWS Great Falls MT
Description: * WHAT...West winds 30 to 40 mph with gusts up to 60 mph possible.

* WHERE...Eastern Toole and Liberty Counties, Cascade County below
5000ft, Judith Basin County and Judith Gap, and Helena Valley.

* WHEN...From late Wednesday night through Thursday afternoon.

* IMPACTS...High winds may move loose debris, damage property and
cause isolated power outages. Travel could be difficult,
especially for high profile vehicles.

Alert: Winter Weather Advisory
Area(s): West Glacier Region
Effective: 2026-05-12 @ 1:27 pm -> 2026-05-14 @ 4:00 pm
Onset: 2026-05-14 @ 1:00 am -> 2026-05-14 @ 4:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-12 @ 1:27 pm
Headline: Winter Weather Advisory issued May 12 at 12:27PM MDT until May 14 at 3:00PM MDT by NWS Missoula MT
Description: * WHAT...Wet snow expected above 5000 feet. Total snow accumulations
of 2 to 5 inches. Winds gusting as high as 50 mph.

* WHERE...Glacier National Park

* WHEN...From midnight Wednesday Night to 3 PM MDT Thursday.

* IMPACTS...Plan on hazardous conditions in the backcountry. Gusty
winds could bring down tree branches.

Alert: Red Flag Warning
Area(s): Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; 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: 2026-05-12 @ 1:01 pm -> 2026-05-13 @ 10:00 pm
Onset: 2026-05-13 @ 11:00 am -> 2026-05-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-05-12 @ 1:01 pm
Headline: Red Flag Warning issued May 12 at 12:01PM MDT until May 13 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 Wednesday. The
Fire Weather Watch is no longer in effect.


* AFFECTED AREA...Fire weather zones 120, 122, 134, 135, 136,
and 137.

* WIND...Southeast at 15 to 30 mph with gusts to 40 mph.

* HUMIDITY...As low as 12 percent.

* THUNDERSTORMS...Moderate confidence of isolated to scattered
late-day thunderstorms.

* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Alert: High Wind Watch
Area(s): Musselshell; Northern Stillwater; Golden Valley; Southwestern Yellowstone
Effective: 2026-05-12 @ 12:35 pm -> 2026-05-14 @ 10:00 pm
Onset: 2026-05-13 @ 7:00 pm -> 2026-05-13 @ 12:45 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-05-12 @ 12:35 pm
Headline: High Wind Watch issued May 12 at 11:35AM MDT until May 14 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...West winds gusting up to 60 mph possible.

* WHERE...Golden Valley, Musselshell, Northern Stillwater, and
Southwestern Yellowstone.

* WHEN...From Wednesday evening through Thursday evening.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles. A few downed trees and power lines are possible.

* ADDITIONAL DETAILS...Winds Wednesday evening will be erratic due to
isolated thunderstorm activity.

Alert: High Wind Watch
Area(s): Judith Gap; Northern Sweet Grass; Melville Foothills; Southern Wheatland
Effective: 2026-05-12 @ 12:35 pm -> 2026-05-14 @ 10:00 pm
Onset: 2026-05-13 @ 7:00 pm -> 2026-05-13 @ 12:45 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-05-12 @ 12:35 pm
Headline: High Wind Watch issued May 12 at 11:35AM MDT until May 14 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...West winds gusting 60 to 70 mph possible.

* WHERE...Judith Gap, Southern Wheatland, Melville Foothills, and
Northern Sweet Grass.

* WHEN...From Wednesday evening through Thursday evening.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles. This includes travel on US-191 from Big Timber to
Harlowton and Judith Gap. A few downed trees and power lines are
possible.

* ADDITIONAL DETAILS...Winds Wednesday evening will be erratic due to
isolated thunderstorm activity.

Alert: High Wind Watch
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; Northern Phillips; Northern Valley
Effective: 2026-05-12 @ 11:56 am -> 2026-05-15 @ 1:00 am
Onset: 2026-05-13 @ 5:00 pm -> 2026-05-13 @ 7:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Glasgow MT on 2026-05-12 @ 11:56 am
Headline: High Wind Watch issued May 12 at 10:56AM MDT until May 15 at 12:00AM MDT by NWS Glasgow MT
Description: * WHAT...Southeast winds possibly gusting to 60 mph then west winds
30 to 40 mph with gusts up to 60 mph possible.

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

* WHEN...From Wednesday afternoon through Thursday evening.

* IMPACTS...Damaging winds could blow down trees and power lines.
Widespread power outages are possible. Travel could be difficult,
especially for high profile vehicles.

Alert: High Wind Watch
Area(s): Daniels; Sheridan; Western Roosevelt; McCone; Richland; Dawson; Prairie; Wibaux; Eastern Roosevelt
Effective: 2026-05-12 @ 11:56 am -> 2026-05-15 @ 1:00 am
Onset: 2026-05-13 @ 10:00 pm -> 2026-05-13 @ 7:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Glasgow MT on 2026-05-12 @ 11:56 am
Headline: High Wind Watch issued May 12 at 10:56AM MDT until May 15 at 12:00AM MDT by NWS Glasgow MT
Description: * WHAT...Southeast winds possibly gusting to 60 mph then West winds
30 to 40 mph with gusts up to 60 mph possible.

* WHERE...Daniels, Dawson, Eastern Roosevelt, McCone, Prairie,
Richland, Sheridan, Western Roosevelt, and Wibaux Counties.

* WHEN...From Wednesday evening through Thursday evening.

* IMPACTS...Damaging winds could blow down trees and power lines.
Widespread power outages are possible. Travel could be difficult,
especially for high profile vehicles.

Alert: High Wind Watch
Area(s): Southwest Phillips
Effective: 2026-05-12 @ 11:56 am -> 2026-05-15 @ 1:00 am
Onset: 2026-05-13 @ 5:00 pm -> 2026-05-13 @ 7:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Glasgow MT on 2026-05-12 @ 11:56 am
Headline: High Wind Watch issued May 12 at 10:56AM MDT until May 15 at 12:00AM MDT by NWS Glasgow MT
Description: * WHAT...West winds 35 to 45 mph with gusts up to 65 mph possible.

* WHERE...Southwest Phillips County.

* WHEN...From Wednesday afternoon through Thursday evening.

* IMPACTS...Damaging winds could blow down trees and power lines.
Widespread power outages are possible. Travel could be difficult,
especially for high profile vehicles.

Alert: Red Flag Warning
Area(s): Deerlodge/Western Beaverhead National Forest; Eastern Beaverhead National Forest
Effective: 2026-05-12 @ 11:38 am -> 2026-05-13 @ 10:00 pm
Onset: 2026-05-13 @ 1:00 pm -> 2026-05-12 @ 7:45 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-12 @ 11:38 am
Headline: Red Flag Warning issued May 12 at 10:38AM MDT until May 13 at 9:00PM MDT by NWS Missoula MT
Description: ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT WEDNESDAY DUE TO
WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD AND EAST
BEAVERHEAD...

The National Weather Service in Missoula MT has issued a Red Flag
Warning in effect from noon to 9 PM MDT Wednesday.

* AFFECTED AREA...Fire Weather Zones 110 and 111.

* TIMING...From noon to 9 PM MDT Wednesday.

* WINDS...Southwest winds 25 to 35 mph with gusts up to 55 mph.

* RELATIVE HUMIDITY...Relative Humidity between 14 to 24 percent.

* STORMS...Scattered thunderstorms causing outflow winds up to 70 mph
and dry lightning.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor
burning is not recommended.

Alert: Wind Advisory
Area(s): West Glacier Region; Flathead/Mission Valleys
Effective: 2026-05-12 @ 11:23 am -> 2026-05-14 @ 1:00 am
Onset: 2026-05-13 @ 1:00 pm -> 2026-05-13 @ 11:30 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-12 @ 11:23 am
Headline: Wind Advisory issued May 12 at 10:23AM MDT until May 14 at 12:00AM MDT by NWS Missoula MT
Description: * WHAT...Southwest winds 20 to 30 mph with gusts up to 50 mph
expected. Isolated stronger gusts are possible with showers and
thunderstorms.

* WHERE...Flathead/Mission Valleys and West Glacier Region.

* WHEN...From noon Wednesday to midnight MDT Wednesday Night.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.

Alert: Wind Advisory
Area(s): Missoula/Bitterroot Valleys; Bitterroot/Sapphire Mountains; Butte/Blackfoot Region; Potomac/Seeley Lake Region
Effective: 2026-05-12 @ 11:23 am -> 2026-05-14 @ 1:00 am
Onset: 2026-05-13 @ 1:00 pm -> 2026-05-13 @ 11:30 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-12 @ 11:23 am
Headline: Wind Advisory issued May 12 at 10:23AM MDT until May 14 at 12:00AM MDT by NWS Missoula MT
Description: * WHAT...Southwest winds 20 to 30 mph with gusts up to 55 mph
expected. Isolated stronger gusts are possible with showers and
thunderstorms.

* WHERE...Bitterroot/Sapphire Mountains, Butte/Blackfoot Region,
Missoula/Bitterroot Valleys, and Potomac/Seeley Lake Region.

* WHEN...From noon Wednesday to midnight MDT Wednesday Night.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.

Alert: Wind Advisory
Area(s): Kootenai/Cabinet Region; Lower Clark Fork Region
Effective: 2026-05-12 @ 11:23 am -> 2026-05-14 @ 1:00 am
Onset: 2026-05-13 @ 10:00 am -> 2026-05-13 @ 11:30 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-05-12 @ 11:23 am
Headline: Wind Advisory issued May 12 at 10:23AM MDT until May 14 at 12:00AM MDT by NWS Missoula MT
Description: * WHAT...Southwest winds 20 to 30 mph with gusts up to 45 mph
expected. Isolated stronger gusts are possible with showers and
thunderstorms.

* WHERE...Kootenai/Cabinet Region and Lower Clark Fork Region.

* WHEN...From 9 AM Wednesday to midnight MDT Wednesday Night.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.

Alert: Hydrologic Outlook
Area(s): Big Horn, MT; Carbon, MT; Golden Valley, MT; Park, MT; Stillwater, MT; Sweet Grass, MT; Wheatland, MT; Yellowstone, MT; Sheridan, WY
Effective: 2026-05-10 @ 4:45 pm
Onset: 2026-05-10 @ 4:45 pm -> 2026-05-13 @ 6:15 pm
Severity: Unknown
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-05-10 @ 4:45 pm
Headline: Hydrologic Outlook issued May 10 at 3:45PM MDT by NWS Billings MT
Description: ESFBYZ

Warm temperatures reaching 10 to 20 degrees above normal will enhance
snowmelt in the mountains this week, resulting in significantly
higher flows on area waterways. Flooding is not expected at this time
due to marginal remaining snowpack in the middle elevations between
6000 and 8000 feet. Rivers such as the Yellowstone and Clarks Fork of
the Yellowstone are forecast to see flows double the current flows by
the end of the week.

Smaller streams and creeks flowing out of the mountains will
experience rises first this week, with larger rivers and streams
further downstream seeing increases by the end of the week.

Those with interests along foothills waterways should be prepared for
higher water levels this week, and move property and livestock away
from rivers, streams, and low lying areas.

Runoff may fill culverts, ditches, and storm drains causing water to
flow over foothills roadways potentially causing damage. Do not drive
over flooded roadways, Turn Around Don't Drown.

Recreationists in the mountains and foothills should be prepared for
changing conditions and use extra caution when near waterways. Flows
will be faster, and the water is very cold.

Stay tuned to the forecast. Please report any flooding to local law
enforcement and have them relay the report to the National Weather
Service.