Flash Flooding and Severe Weather concerns continue for portions of theSouthern Plains, Gulf Coast, Lower Mississippi Valley and Southeast Freezing rain impacts possible over parts of southern Maine/central NewEngland tonightUnseasonably warm air surges into the eastern third of the countryleading to widespread record low temperatures through Thursday nightA shortwave trough will support repeated rounds of convection to developacross the southern tier of the country over the next few days. Tonightappears to be the worst of it from a heavy rainfall and severe weatherstandpoint as anomalous moisture and significant instability make theirway into the region. A Moderate Risk (level 3/4) of Excessive Rainfallleading to Flash Flooding is in effect for portions of eastern Texas,Louisiana and southwest-to-central Mississippi, where the confluence ofmoisture, instability and lift along the surface front will be greatest.In addition to the Moderate Risk of Excessive Rainfall, a Slight Risk(level 2/4) of Severe Thunderstorms is in effect over the Central GulfCoast where a few tornadoes and severe-wind gusts are possible. Theprimary Flash Flood risk pivots into parts of the Southeast and SouthernAppalachians while remaining over the central Gulf Coast. The Severethreat remains for the Lower Mississippi Valley and Southeast, but at alower/Marginal risk.