Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Tue May 11 2021 Valid 12Z Tue May 11 2021 - 12Z Thu May 13 2021 ...Widespread rain and thunderstorms will persist across the Gulf Coast states... ...Ongoing snow in the Central Rockies and Wind River Mountains/Tetons could continue through the day today... ...Much below normal temperatures should remain across much of the U.S., with Florida and the West Coast the exceptions... A meandering frontal boundary is forecast to remain across the Gulf Coast states and eventually slowly sink southward on Wednesday into Thursday. Moist inflow from the Gulf of Mexico interacting with the front should help create additional widespread showers and thunderstorms in those areas, especially through tonight. An inch or two of rain, with locally higher amounts possible, is expected for portions of eastern Texas into the Lower Mississippi Valley and the Southeast. This rainfall and wet antecedent conditions will lead to the potential for scattered flash floods in those areas, and a Slight Risk of excessive rainfall as well as a Flash Flood Watch are in place through tonight. Strong to severe thunderstorms are also a possibility. Some showers and thunderstorms are possible Wednesday, though are expected to lessen in coverage later Wednesday into Thursday as the front gets suppressed. Upper-level energy and cold temperatures will support continued snowfall across higher elevations of the Wind River Mountains/Tetons and the Central Rockies today. Another several inches of late-season snow are possible especially in central Colorado. Snow should end by tonight as the supporting upper-level energy moves east out of the region. However, some light rain could continue in the Central Plains. Meanwhile in the Northeast, persistent surface low pressure systems could cause light to moderate precipitation through Wednesday. Mainly rain is expected, but higher elevations could see some mix or light snow. Another couple of days of cooler than normal temperatures are forecast for the central and eastern U.S. behind the potent cold front and underneath a cool high pressure system. This morning, Frost Advisories and Freeze Warnings are once again in effect for portions of the Great Lakes region, and also stretch into the Northern/Central Plains and Upper Midwest. High temperatures are expected to be in the 40s in the Central High Plains, with some areas 30+ degrees below normal today, and potential for record low maximum temperatures to be set in the south-central U.S. That potential for setting records of low maximum temperatures should spread to the Carolinas on Wednesday. Meanwhile, Florida can expect warm temperatures south of the front, and the West Coast will also see building warmth with above normal temperatures over the next few days. One more day of an Elevated Risk of fire weather is expected in northern California and New Mexico. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php