* WHAT. Flash flooding caused by excessive rainfall is possible. * WHERE. Portions of southwest and western Arkansas, including the following areas, in southwest Arkansas, Calhoun, Clark, Dallas, Hot Spring, Ouachita and Pike. In western Arkansas, Central and Eastern Montgomery County, Central and Southern Scott County, Northern Montgomery County Higher Elevations, Northern Polk County Higher Elevations, Northern Scott County, Polk County Lower Elevations, Southeast Polk County Higher Elevations and Southwest Montgomery County Higher Elevations. * WHEN. Through Saturday 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. - Several rounds of heavy rainfall are expected across the area as an upper level low moves north over eastern Oklahoma with likely periods of seeing the heaviest rainfall coming this afternoon and evening and again on Friday afternoon and evening. Rainfall amounts of 4-6 inches are expected across the area with some areas seeing as much as 5-7 inches with locally higher amounts possible. - http://www.weather.gov/safety/flood