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 The Fire Weather Watch is no longer in effect.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. |