* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of the Panhandle of Texas, including the following counties, Collingsworth, Donley, Gray, Hemphill and Wheeler. * WHEN...From 7 PM CDT this evening 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... - Repeat rounds of showers and thunderstorms will produce heavy rainfall across these affected areas starting Tuesday evening through Wednesday night. - Pampa, McLean, Clarendon, Hedley, Wellington, Shamrock, Wheeler, Canadian. - http://www.weather.gov/safety/flood