Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 303 PM EST Fri Nov 27 2020 Valid 00Z Sat Nov 28 2020 - 00Z Mon Nov 30 2020 ...Heavy rain and thunderstorms spreading across the Gulf Coast region today and expanding east toward the Florida Panhandle by Sunday... ...Critical fire weather across portions of southern California... ...Widespread above normal temperatures across the northern and eastern United States; below normal temperatures in the Southern Plains and Lower Mississippi Valley... A slow moving frontal boundary, which is currently draped along the northern Gulf Coast, will continue to bring heavy rain and scattered to isolated thunderstorms to the region tonight. Low pressure will develop along the Texas portion of the front tomorrow and begin moving east. This low pressure system will become the focus for the heavy rain and thunderstorms along the Gulf Coast as it traverses the Lower Mississippi Valley and Southeast through Sunday. Slight Risks of Excessive Rainfall leading to Flash Flooding are in effect for parts of the eastern Texas coast, and the Lower Mississippi Valley through tomorrow. This system is forecast to strengthen as it moves up the spine of the Appalachians beginning Sunday night. Cool air will filter in on the backside of the developing system over the Southern Plains tomorrow. This cool airmass will moderate slightly as it spreads east into the Lower Mississippi Valley on Sunday. Above average temperatures will spread over the Northern/Central Plains and Upper Midwest tomorrow as high pressure builds in that area. Dry and windy conditions will promote the Critical Fire Weather Risk across southern California tonight while an Elevated risk will linger over parts of the area tomorrow. Kebede Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php