Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flood Watch |
| Area(s): | Petroleum; Garfield; Dawson; Prairie; Wibaux |
| Effective: | 2026-09-19 @ 3:01 am -> 2026-09-19 @ 6:15 pm |
| Onset: | 2026-09-19 @ 7:00 am -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-09-19 @ 3:01 am |
| Headline: | Flood Watch issued September 19 at 2:01AM MDT until September 20 at 6:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of northeast Montana, including the following counties, Dawson, Garfield, Petroleum, Prairie and Wibaux. * WHEN...From 6 AM MDT this morning through Sunday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. * ADDITIONAL DETAILS... - Heavy rain is expected along and south of MT 200 between Winnett, Jordan and Glendive and south of I 94 between Glendive and Wibaux today, tonight, and Sunday morning. Between one and two inches of rain is likely with heavier rain possible in embedded thunderstorms. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Fallon; Carter |
| Effective: | 2026-09-18 @ 11:59 pm -> 2026-09-20 @ 12:00 am |
| Onset: | 2026-09-18 @ 11:59 pm -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-09-18 @ 11:59 pm |
| Headline: | Flood Watch issued September 18 at 10:59PM MDT until September 20 at 6:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is possible, along with Flash Flooding of recent burn scars. * WHERE...All of South Central and Southeast Montana, and Sheridan County Wyoming. * WHEN...Through Sunday afternoon. * IMPACTS...Excessive runoff may result in flooding of creeks and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - 1 to 3 inches of additional rainfall is expected across the watch area through Sunday. Locally heavier totals over 4 inches are possible where thunderstorm activity is more persistent. - The Robertson Draw, East Side, Elk, and McGhee-Remington burn scars are particularly vulnerable to Flash Flooding and debris flows during the watch period. Any other burn scars from this summer will have elevated Flash Flood potential as well. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Musselshell; Treasure; Northern Rosebud; Custer; Northern Stillwater; Powder River; Northern Park; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Rosebud; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Absaroka/Beartooth Mountains; Crazy Mountains; Southern Big Horn; Southeastern Carbon; Northern Sweet Grass; Bighorn Canyon; Northern Carbon; Pryor/Northern Bighorn Mountains; Melville Foothills; Northeastern Yellowstone; Southern Wheatland; Southwestern Yellowstone; Northeast Bighorn Mountains; Sheridan Foothills |
| Effective: | 2026-09-18 @ 11:59 pm -> 2026-09-20 @ 12:00 am |
| Onset: | 2026-09-18 @ 11:59 pm -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-09-18 @ 11:59 pm |
| Headline: | Flood Watch issued September 18 at 10:59PM MDT until September 20 at 6:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is possible, along with Flash Flooding of recent burn scars. * WHERE...All of South Central and Southeast Montana, and Sheridan County Wyoming. * WHEN...Through Sunday afternoon. * IMPACTS...Excessive runoff may result in flooding of creeks and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - 1 to 3 inches of additional rainfall is expected across the watch area through Sunday. Locally heavier totals over 4 inches are possible where thunderstorm activity is more persistent. - The Robertson Draw, East Side, Elk, and McGhee-Remington burn scars are particularly vulnerable to Flash Flooding and debris flows during the watch period. Any other burn scars from this summer will have elevated Flash Flood potential as well. - http://www.weather.gov/safety/flood |
| Alert: | Flash Flood Watch |
| Area(s): | Northwest Beaverhead County |
| Effective: | 2026-09-18 @ 11:39 am -> 2026-09-19 @ 7:00 am |
| Onset: | 2026-09-18 @ 4:00 pm -> 2026-09-19 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-18 @ 11:39 am |
| Headline: | Flash Flood Watch issued September 18 at 10:39AM MDT until September 19 at 6:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfall continue to be possible over the Sand Creek and Bobcat Lakes Burn Scars. * WHERE...A portion of southwest Montana, including the following area, Northwest Beaverhead County. * WHEN...From 3 PM MDT this afternoon through Saturday afternoon. * IMPACTS...Heavy rainfall over the Sand Creek and Bobcat Lakes Burn Scars is expected up to and during the period of the watch. Residents near the Sand Creek and Bobcat Lakes Burn Scars should prepare for potential debris flow. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas, urbanized street flooding, and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - Showers and thunderstorms capable of producing locally intense rainfall are forecast to develop over the burn scar late this afternoon through this evening with additional precipitation expected through Saturday, which may lead to flash flooding and debris flows. - Some locations that may experience flash flooding include... Areas near the Sand Creek and Bobcat Lakes Burn Scars, including portions of the Pioneer Mountains Scenic Byway. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Gallatin Valley |
| Effective: | 2026-09-18 @ 11:39 am -> 2026-09-19 @ 7:00 am |
| Onset: | 2026-09-18 @ 7:00 pm -> 2026-09-19 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-18 @ 11:39 am |
| Headline: | Flood Watch issued September 18 at 10:39AM MDT until September 19 at 6:00PM MDT by NWS Great Falls MT |
| Description: |
The Flash Flood Watch has been changed to a Flood Watch. |
| Alert: | Flood Watch |
| Area(s): | Helena Valley; Meagher County Valleys; Canyon Ferry Area |
| Effective: | 2026-09-18 @ 11:39 am -> 2026-09-19 @ 7:00 am |
| Onset: | 2026-09-18 @ 7:00 pm -> 2026-09-19 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-18 @ 11:39 am |
| Headline: | Flood Watch issued September 18 at 10:39AM MDT until September 19 at 6:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...The Canyon Ferry Area, Helena Valley, and Meagher County Valleys in Central Montana * WHEN...From 6 PM MDT this evening through Saturday afternoon. * IMPACTS...Excessive runoff may result in flooding of low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Showers and thunderstorms capable of producing hourly rainfall rates of between 0.25 inch to 0.5 inch are possible. - Some locations impacted include Helena, Townsend, and White Sulphur Springs - http://www.weather.gov/safety/flood |
| Alert: | Flash Flood Watch |
| Area(s): | Little Belt and Highwood Mountains; Big Belt, Bridger and Castle Mountains; Elkhorn and Boulder Mountains |
| Effective: | 2026-09-18 @ 11:39 am -> 2026-09-19 @ 7:00 am |
| Onset: | 2026-09-18 @ 7:00 pm -> 2026-09-20 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-18 @ 11:39 am |
| Headline: | Flash Flood Watch issued September 18 at 10:39AM MDT until September 20 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Horse Gulch area and burn scars from the summer of 2026. * WHERE...A portion of central Montana, including the following areas, Big Belt, Bridger and Castle Mountains, Elkhorn and Boulder Mountains and Little Belt and Highwood Mountains. * WHEN...From 6 PM MDT this evening through Saturday evening. * IMPACTS...Heavy rainfall over the Horse Gulch area and burn scars from the summer of 2026 is expected up to and during the period of the watch. Residents near the Horse Gulch area and burn scars from the summer of 2026 should prepare for potential debris flow. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas, urbanized street flooding, and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over recent burn scars, which may lead to flash flooding and debris flows. - Some locations that may experience flash flooding include... Areas near recent burn scars from the summer 2026 and the Horse Gulch area. - http://www.weather.gov/safety/flood |
