Yellowstone National Park, Wyoming
Regional Weather Alerts
| 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 @ 12:39 am -> 2026-05-14 @ 7:00 pm |
| Onset: | 2026-05-14 @ 1:00 am -> 2026-05-12 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-05-12 @ 12:39 am |
| Headline: | High Wind Watch issued May 11 at 11:39PM 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: | 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 @ 12:39 am -> 2026-05-15 @ 1:00 am |
| Onset: | 2026-05-14 @ 1:00 am -> 2026-05-12 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-05-12 @ 12:39 am |
| Headline: | High Wind Watch issued May 11 at 11:39PM 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 gust 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 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): | 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 @ 12:39 am -> 2026-05-15 @ 1:00 am |
| Onset: | 2026-05-14 @ 4:00 am -> 2026-05-12 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-05-12 @ 12:39 am |
| Headline: | High Wind Watch issued May 11 at 11:39PM 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: | Fire Weather Watch |
| Area(s): | Hill and Blaine Counties |
| Effective: | 2026-05-12 @ 12:10 am -> 2026-05-13 @ 10:00 pm |
| Onset: | 2026-05-13 @ 1:00 pm -> 2026-05-12 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-05-12 @ 12:10 am |
| Headline: | Fire Weather Watch issued May 11 at 11:10PM MDT until May 13 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* AFFECTED AREA...Hill and Blaine Counties. * WINDS...South 15 to 25 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 17 percent. * TEMPERATURES...Low 90s. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| Alert: | Fire Weather Watch |
| 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 @ 12:04 am -> 2026-05-13 @ 10:00 pm |
| Onset: | 2026-05-13 @ 11:00 am -> 2026-05-12 @ 6:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-05-12 @ 12:04 am |
| Headline: | Fire Weather Watch issued May 11 at 11:04PM MDT until May 13 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
The National Weather Service in Glasgow has issued a Fire Weather Watch, which is in effect from Wednesday morning through Wednesday evening. * 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 thunderstorms. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | High Wind Watch |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Northern Valley; Eastern Roosevelt |
| Effective: | 2026-05-11 @ 11:58 pm -> 2026-05-15 @ 1:00 am |
| Onset: | 2026-05-14 @ 7:00 am -> 2026-05-12 @ 6:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-05-11 @ 11:58 pm |
| Headline: | High Wind Watch issued May 11 at 10:58PM MDT until May 15 at 12:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...West northwest winds 30 to 45 mph with gusts up to 60 mph possible. * WHERE...A portion of northeast Montana. * WHEN...Thursday. * 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: | 2026-05-11 @ 11:58 pm -> 2026-05-15 @ 1:00 am |
| Onset: | 2026-05-13 @ 10:00 pm -> 2026-05-12 @ 6:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-05-11 @ 11:58 pm |
| Headline: | High Wind Watch issued May 11 at 10:58PM MDT until May 15 at 12:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...West winds 30 to 45 mph with gusts up to 70 mph possible. * WHERE...Southwest Phillips County. * 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: | Fire Weather Watch |
| Area(s): | Deerlodge/Western Beaverhead National Forest; Eastern Beaverhead National Forest |
| Effective: | 2026-05-11 @ 1:00 pm -> 2026-05-13 @ 10:00 pm |
| Onset: | 2026-05-13 @ 1:00 pm -> 2026-05-12 @ 4:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-05-11 @ 1:00 pm |
| Headline: | Fire Weather Watch issued May 11 at 12:00PM MDT until May 13 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD AND EAST BEAVERHEAD... The National Weather Service in Missoula MT has issued a Fire Weather Watch. * AFFECTED AREA...Fire Weather Zones 110 and 111. * TIMING...From Wednesday afternoon through Wednesday evening. * WINDS...Southwest winds 30 to 40 mph with gusts up to 60 mph. * RELATIVE HUMIDITY...Relative Humidity between 13 to 23 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| 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. |