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Lewis and Clark County

Flash Flood Watch issued September 19 at 10:06AM MDT until September 20 at 12:00AM MDT by NWS Great Falls MT

10:06 AM — 6:15 PM

* 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...Through this 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

Flood Watch issued September 19 at 10:06AM MDT until September 19 at 6:00PM MDT by NWS Great Falls MT

10:06 AM — 6:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...The Canyon Ferry Area, Helena Valley, and Meagher County Valleys in Central Montana * WHEN...Until 6 PM MDT this evening. * IMPACTS...Excessive runoff may result in flooding of low-lying and flood-prone locations. * ADDITIONAL DETAILS... - An area of rain will bring additional precipitation amounts to around 0.5 inch today, with locally higher amounts near the mountains. - Some locations impacted include Helena, Townsend, White Sulphur Springs, and Bozeman. - http://www.weather.gov/safety/flood

Flood Advisory issued September 19 at 7:46AM MDT until September 19 at 1:45PM MDT by NWS Great Falls MT

7:46 AM — 1:45 PM

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Central Meagher County in central Montana... East Central Broadwater County in southwestern Montana... * WHEN...Until 145 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 746 AM 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 3 inches of rain have fallen. - Some locations that will experience flooding include... Mainly rural areas of Central Meagher and East Central Broadwater Counties. - http://www.weather.gov/safety/flood

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