* WHAT...Localized flash flooding caused by excessive thunderstorm rainfall is possible. * WHERE...Portions of panhandle Nebraska, including the following areas, Banner County, Box Butte County, Cheyenne County, Dawes County, Kimball County, Morrill County, Northern Sioux County, Scotts Bluff County and Southern Sioux County and Wyoming, including the following areas, Central Laramie County, East Laramie County, East Platte County, Goshen County, Niobrara County and South Laramie Range Foothills. * WHEN...Until 10 PM MDT this evening. * 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... - Strong, slow moving thunderstorms with locally heavy rainfall will be possible this afternoon and evening. Heavy rainfall may affect areas that received heavy rainfall and localized flooding yesterday. - http://www.weather.gov/safety/flood