Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Severe Thunderstorm Warning |
| Area(s): | Lewis and Clark, MT; Teton, MT |
| Effective: | 2026-07-17 @ 3:51 pm -> 2026-07-17 @ 4:45 pm |
| Onset: | 2026-07-17 @ 3:51 pm -> 2026-07-17 @ 4:45 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Immediate |
| Issued By: | NWS Great Falls MT on 2026-07-17 @ 3:51 pm |
| Headline: | Severe Thunderstorm Warning issued July 17 at 2:51PM MDT until July 17 at 3:45PM MDT by NWS Great Falls MT |
| Description: |
SVRTFX The National Weather Service in Great Falls has issued a * Severe Thunderstorm Warning for... Northwestern Lewis and Clark County in west central Montana... Southwestern Teton County in north central Montana... * Until 345 PM MDT. * At 250 PM MDT, a severe thunderstorm was located 16 miles northwest of Augusta, or 30 miles southwest of Choteau, moving east at 15 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * Locations impacted include... Augusta, Pishkun Reservoir, and Nilan Reservoir. |
| Alert: | Flash Flood Warning |
| Area(s): | Park, MT; Sweet Grass, MT |
| Effective: | 2026-07-17 @ 3:16 pm -> 2026-07-17 @ 6:15 pm |
| Onset: | 2026-07-17 @ 3:16 pm -> 2026-07-17 @ 6:15 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Immediate |
| Issued By: | NWS Billings MT on 2026-07-17 @ 3:16 pm |
| Headline: | Flash Flood Warning issued July 17 at 2:16PM MDT until July 17 at 5:15PM MDT by NWS Billings MT |
| Description: |
FFWBYZ The National Weather Service in Billings has issued a * Flash Flood Warning for... Central Park County in south central Montana... West Central Sweet Grass County in south central Montana... * Until 515 PM MDT. * At 216 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, including the Boulder River south of Mc Leod, as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Mainly rural areas of Central Park and West Central Sweet Grass Counties. |
| Alert: | Special Weather Statement |
| Area(s): | Southern Rocky Mountain Front; Southern High Plains |
| Effective: | 2026-07-17 @ 3:14 pm -> 2026-07-17 @ 4:15 pm |
| Onset: | 2026-07-17 @ 3:14 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-17 @ 3:14 pm |
| Headline: | Special Weather Statement issued July 17 at 2:14PM MDT by NWS Great Falls MT |
| Description: |
At 213 PM MDT, Doppler radar was tracking a strong thunderstorm 29 miles northwest of Augusta, or 36 miles west of Choteau, moving northeast at 20 mph. HAZARD...Wind gusts of 50 to 55 mph and half-inch size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Pishkun Reservoir. |
| 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 |