* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Portions of eastern and southeast Idaho, including the following areas, in eastern Idaho, Big Hole Mountains, Centennial Mountains - Island Park and Teton Valley. In southeast Idaho, Bear Lake Valley, Bear River Range, Blackfoot Mountains, Caribou Range, Franklin/Eastern Oneida Region and Marsh and Arbon Highlands.
* WHEN...From Wednesday afternoon through Wednesday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.
* ADDITIONAL DETAILS... - An abnormally moist airmass will overspread eastern Idaho later tonight and continue into the day tomorrow. Thunderstorms are expected to be efficient rainfall producers and flash flooding will be possible across the watch area. - http://www.weather.gov/safety/flood