* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of northwest Arkansas, including the following counties, Benton and Washington AR and Oklahoma, including the following counties, Adair, Cherokee, Craig, Delaware, Mayes, Nowata and Ottawa. * WHEN...From Saturday evening through Sunday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Areas of heavy rain rain are likely as a cold front moves through. Under the stronger storms, several inches of rain may occur. - http://www.weather.gov/safety/flood