Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 408 PM EDT Sun Oct 25 2015 Valid 00Z Mon Oct 26 2015 - 00Z Wed Oct 28 2015 ...Heavy rains and risk of flash flooding to shift eastward into the lower Mississippi Valley... ...Severe thunderstorms possible for coastal Louisiana... Conditions over eastern Texas continue to improve as the low pressure system shifts east over the Deep South. Much of the lower Mississippi River Valley will receive the brunt of the strong wind speeds and heavier rain over the next couple of days - 4 to 6.5 inches will be common along the Mississippi delta/Florida panhandle corridor. This region will have an elevated risk of flash flooding though Tuesday morning. The low is expected to slowly weaken by Tuesday morning...but the continued influx of both gulf and western Atlantic moisture will allow rains to slowly spread northward into the Tennessee Valley and lower Ohio Valley by Monday night -- 1 to 3 inches possible over the next 3 days. Cool, high pressure will build in behind the cold front across the Great Lakes/Northeast region. This will allow for considerably cooler temperatures to spread across the Great Lakes into New England Sunday night into Monday. In the west...low pressure off the Pacific Northwest coast is expected to spread showers into the region on Sunday with a general weakening precipitation shield spreading eastward into the northern Intermountain region late Sunday and Monday. Showers will also develop across portions of the Intermountain West and High Plains north of a quasi-stationary frontal boundary. Cooler air will push southward as a cold front drops southward from western Canada in response to building upper ridge across extreme western Canada. Precipitation amounts across the Pacific Northwest and the Intermountain West will generally be less than 1 inch, localized amounts of 1.25 to 1.50 inches will be possible in the Olympics, Cascades and the Rockies. Light snow will be possible in the higher elevations. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php