Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flood Advisory |
| Area(s): | Musselshell, MT |
| Effective: | 2026-07-17 @ 11:17 pm -> 2026-07-18 @ 2:15 am |
| Onset: | 2026-07-17 @ 11:17 pm -> 2026-07-18 @ 2:15 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-17 @ 11:17 pm |
| Headline: | Flood Advisory issued July 17 at 10:17PM MDT until July 18 at 1:15AM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Northern Musselshell County in central Montana... * WHEN...Until 115 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. * ADDITIONAL DETAILS... - At 1017 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 1.5 inches of rain have fallen. - Additional rainfall amounts of 0.2 to 0.5 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Mainly rural areas of Northern Musselshell County. - http://www.weather.gov/safety/flood |
| Alert: | Flood Advisory |
| Area(s): | Big Horn, MT |
| Effective: | 2026-07-17 @ 10:41 pm -> 2026-07-18 @ 12:00 am |
| Onset: | 2026-07-17 @ 10:41 pm -> 2026-07-18 @ 12:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-17 @ 10:41 pm |
| Headline: | Flood Advisory issued July 17 at 9:41PM MDT until July 17 at 11:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall continues. * WHERE...Northwestern Big Horn County in south central Montana... * WHEN...Until 1100 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rainfall will drain into the Bighorn River potentially causing increases in flows. * ADDITIONAL DETAILS... - At 938 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1.5 and 2.5 inches of rain have fallen. - Flooding impacts will continue, additional rainfall amounts of less than 0.25 inches is expected. - Some locations that will experience flooding include... Mainly rural areas of Northwestern Big Horn County. - http://www.weather.gov/safety/flood |
| Alert: | Flash Flood Warning |
| Area(s): | Broadwater, MT; Lewis and Clark, MT |
| Effective: | 2026-07-17 @ 10:06 pm -> 2026-07-18 @ 2:00 am |
| Onset: | 2026-07-17 @ 10:06 pm -> 2026-07-18 @ 2:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Immediate |
| Issued By: | NWS Great Falls MT on 2026-07-17 @ 10:06 pm |
| Headline: | Flash Flood Warning issued July 17 at 9:06PM MDT until July 18 at 1:00AM MDT by NWS Great Falls MT |
| Description: |
FFWTFX The National Weather Service in Great Falls has issued a * Flash Flood Warning for... The Horse Gulch burn scar in... Northwestern Broadwater County in southwestern Montana... Southeastern Lewis and Clark County in west central Montana... * Until 100 AM MDT. * At 906 PM MDT, Doppler radar indicated heavy rain over the Horse Gulch Burn Scar. Up to 1 inch of rain has fallen. The expected rainfall rate is 0.5 inches in 1 hour. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow moving through the Some drainage basins impacted include... The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Flash flooding caused by heavy rain in and around the Horse Gulch Burn Scar. SOURCE...Radar indicated. IMPACT...Flooding of areas in and around the Horse Gulch Burn Scar. * Some locations that will experience flash flooding include... Mainly rural areas of Northwestern Broadwater and Southeastern Lewis and Clark Counties. |
| Alert: | Flood Advisory |
| Area(s): | Cascade, MT; Judith Basin, MT |
| Effective: | 2026-07-17 @ 9:35 pm -> 2026-07-18 @ 12:30 am |
| Onset: | 2026-07-17 @ 9:35 pm -> 2026-07-18 @ 12:30 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-17 @ 9:35 pm |
| Headline: | Flood Advisory issued July 17 at 8:35PM MDT until July 17 at 11:30PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...East Central Cascade County in central Montana... Northwestern Judith Basin County in central Montana... * WHEN...Until 1130 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 835 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2 inches of rain have fallen. - Additional rainfall amounts of 0.5 to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Belt and Armington. - http://www.weather.gov/safety/flood |
| Alert: | Flood Advisory |
| Area(s): | Broadwater, MT; Meagher, MT |
| Effective: | 2026-07-17 @ 9:33 pm -> 2026-07-18 @ 12:30 am |
| Onset: | 2026-07-17 @ 9:33 pm -> 2026-07-18 @ 12:30 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-17 @ 9:33 pm |
| Headline: | Flood Advisory issued July 17 at 8:33PM MDT until July 17 at 11:30PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Northwestern Meagher County in central Montana... North Central Broadwater County in southwestern Montana... * WHEN...Until 1130 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 833 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2 inches of rain have fallen. - Additional rainfall amounts of 0.5 to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Fort Logan On The Smith River and Fort Logan. - http://www.weather.gov/safety/flood |
| Alert: | Flash Flood Watch |
| Area(s): | Big Belt, Bridger and Castle Mountains |
| Effective: | 2026-07-17 @ 1:23 am -> 2026-07-18 @ 1:00 am |
| Onset: | 2026-07-17 @ 1:23 am -> 2026-07-18 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-07-17 @ 1:23 am |
| Headline: | Flash Flood Watch issued July 17 at 12:23AM MDT until July 18 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfalL will be possible over the Horse Gulch Burn Scar this afternoon and evening. * WHERE...A portion of central Montana, including the following areas, portions of southeast Lewis and Clark County and northwest Meagher County. * WHEN...Through this evening. * IMPACTS...Localized heavy rainfall from thunderstorms is expected over the Horse Gulch Burn Scar this afternoon and evening. Residents near the Horse Gulch Burn Scar should prepare for potential debris flows and flash flooding. * ADDITIONAL DETAILS... - Scattered to numerous showers and thunderstorms will be capable of producing heavy rainfall over the burn scar, which may lead to flash flooding and debris flows. - Some locations that may experience flash flooding include... Areas over and near the Horse Gulch Burn scar - http://www.weather.gov/safety/flood |