* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Horse Gulch Burn Scar. * WHERE...A portion of central Montana, including the following area, Big Belt, Bridger and Castle Mountains. * WHEN...From Thursday afternoon through Thursday evening. * IMPACTS...Heavy rainfall over the Horse Gulch Burn Scar is expected up to and during the period of the watch. Rainfall rates of 0.25 to 0.75 of an inch per hour are possible with thunderstorms. Residents near the Horse Gulch Burn Scar 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 the burn scar, which may lead to flash flooding and debris flows. - Some locations that may experience flash flooding include... Maudlow, Trident and York. - http://www.weather.gov/safety/flood