Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flash Flood Watch |
| Area(s): | Red Lodge Foothills; Absaroka/Beartooth Mountains; Northeast Bighorn Mountains |
| Effective: | 2026-05-29 @ 11:15 am -> 2026-05-30 @ 11:15 am |
| Onset: | 2026-05-30 @ 7:00 am -> 2026-05-31 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-05-29 @ 11:15 am |
| Headline: | Flash Flood Watch issued May 29 at 10:15AM MDT until May 31 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Elk, Robertson Draw, and East Side Burn Areas on Saturday. * WHERE...Portions of south central Montana, including the following areas, Absaroka/Beartooth Mountains and Red Lodge Foothills and north central Wyoming, including the following area, Northeast Bighorn Mountains. * WHEN...From Saturday morning through Saturday evening. * IMPACTS...Periods of heavy rainfall with embedded thunderstorms are expected over the Elk, Robertson Draw, and East Side Burn Areas Saturday, possibly beginning early in the morning. Residents near these burn scars should prepare for potential rapid runoff, flooding and debris flows. Narrow drainages and low-lying areas are especially prone to flood. Be sure to stay up to date with information from local authorities. * ADDITIONAL DETAILS... - Periods of heavy rainfall with embedded thunderstorms are expected across the region. The Elk Burn Area along the eastern slopes of the Bighorns, and the Robertson Draw and East Side Burn Areas south of Red Lodge, could experience flash flooding and debris flows. Stay alert! - http://www.weather.gov/safety/flood |
| Alert: | Hydrologic Outlook |
| Area(s): | Cascade, MT; Chouteau, MT; Glacier, MT; Hill, MT; Judith Basin, MT; Lewis and Clark, MT; Liberty, MT; Meagher, MT; Pondera, MT; Teton, MT; Toole, MT |
| Effective: | 2026-05-29 @ 5:25 am -> 2026-05-29 @ 7:00 pm |
| Onset: | 2026-05-29 @ 5:25 am |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-05-29 @ 5:25 am |
| Headline: | Hydrologic Outlook issued May 29 at 4:25AM MDT by NWS Great Falls MT |
| Description: |
ESFTFX What: Widespread heavy rainfall Saturday into Monday. Where: Mostly the western portion of North Central MT. Timing: The heavier rainfall will begin on Saturday and then diminish on Monday. Rainfall rates of around 0.50 to 0.75 are possible every 6 hours over a 36 hour period. Relevant factors: Overall, total precipitation amounts for most areas will range from 1 to 2 inches. About 10 percent of the area will receive closer to 3 inches of rainfall. In terms of flooding, given the recent dry period, most of the area will be handle the first few inches of rainfall. However, areas that receive 3 or more inches of rainfall could start to have impacts. Additionally, there is still a minor snowpack left in the mountains that could add to runoff concerns as the remaining snow washes out. Thus some flood statements might be needed later this weekend should flooding develop over the Plains or along rivers. Everyone is reminded that should flooding develop, regardless if the roadway is paved or not, do not drive through any flood waters, as you do not know if the road has been washed out under the flood waters. Please monitor the National Weather Service or the local media this weekend for further updates on this spring storm. |
| Alert: | Heat Advisory |
| Area(s): | Daniels; Sheridan; Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Northern Valley; Eastern Roosevelt |
| Effective: | 2026-05-29 @ 5:02 am -> 2026-05-29 @ 1:15 pm |
| Onset: | 2026-05-29 @ 5:02 am -> 2026-05-29 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-29 @ 5:02 am |
| Headline: | Heat Advisory issued May 29 at 4:02AM MDT until May 29 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Temperatures in the 90s. * WHERE...Daniels, Dawson, Eastern Roosevelt, Northern Phillips, Northern Valley, Prairie, Richland, Sheridan, Western Roosevelt, and Wibaux Counties. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Heat Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Garfield; McCone |
| Effective: | 2026-05-29 @ 5:02 am -> 2026-05-29 @ 1:15 pm |
| Onset: | 2026-05-29 @ 5:02 am -> 2026-05-29 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-29 @ 5:02 am |
| Headline: | Heat Advisory issued May 29 at 4:02AM MDT until May 29 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Temperatures in the mid 90s. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, and McCone Counties. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Hydrologic Outlook |
| Area(s): | Deer Lodge, MT; Flathead, MT; Granite, MT; Lake, MT; Missoula, MT; Powell, MT; Ravalli, MT; Silver Bow, MT |
| Effective: | 2026-05-28 @ 2:51 pm -> 2026-05-29 @ 1:00 pm |
| Onset: | 2026-05-28 @ 2:51 pm |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-05-28 @ 2:51 pm |
| Headline: | Hydrologic Outlook issued May 28 at 1:51PM MDT by NWS Missoula MT |
| Description: |
ESFMSO What: Widespread Moderate to Heavy Precipitation Where: Western Montana Counties: Flathead, Lake, Missoula, Powell, Granite, Ravalli, Deer Lodge, and Silver Bow Timing: Saturday May 30 through Monday June 1, 2026 Relevant factors: Total precipitation amounts of 1 to 3 inches with locally higher amounts possible in higher terrain along the divide. Ongoing snowmelt and recent precipitation has kept stream and river levels rising. Anticipate further rises in local waterways, rockfall and mudslide potential in steep terrain, as well as possible urban and low-land flooding. The Clark Fork River near Missoula is currently forecast to reach near 8 feet by Monday afternoon, June 1. The Flathead River near Columbia Falls is currently forecast to reach near 14 feet by Tuesday night, June 2. Additional information will be provided at or before Noon MDT on May 29th. |