* WHAT...Flash flooding caused by excessive rainfall from thunderstorms is possible.
* WHERE...Portions of central and south central Montana, including the following areas, in central Montana, Golden Valley and Musselshell. In south central Montana, Melville Foothills, Northeastern Yellowstone, Northern Stillwater, Northern Sweet Grass and Southwestern Yellowstone.
* WHEN...From Wednesday afternoon through late Wednesday night.
* IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS... - Slow moving showers and thunderstorms capable of producing very heavy rainfall rates. - http://www.weather.gov/safety/flood