Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 327 AM EST Sat Nov 28 2020 Valid 12Z Sat Nov 28 2020 - 12Z Mon Nov 30 2020 ...Heavy rain and thunderstorms will spread from the Deep South toward the East Coast during the next couple of days... A slow-moving frontal boundary has been the focus for moderate to heavy rain with embedded thunderstorms along the western and central Gulf Coast. Meanwhile, an upper-level disturbance currently bringing light snow across the southern Rockies will exit into the southern Plains and begin to interact with the frontal boundary tonight. This interaction will result in a low pressure system forming near the western Gulf Coast early on Sunday before intensifying further and moving into the southern Appalachians by early on Monday. A swath of rain and embedded thunderstorms is expected to develop across eastern Texas today, and then expand across the lower Mississippi Valley into the Southeast on Sunday. Areas of flash flooding are possible near the eastern Texas coast and into southern Louisiana through tonight. By Monday morning, the low pressure system is forecast to continue strengthening as the center moves up the spine of the Appalachians, spreading rain into the Mid-Atlantic and the Appalachians with some wintry precipitation farther northwest across the Ohio Valley and the Great Lakes. A very mild afternoon is expected today over the northern/central Plains as southwesterly winds develop well ahead of a low pressure system traversing the U.S.-Canadian border. Cooler air behind a cold front will drop temperatures closer to normal on Sunday in these areas. Farther south, colder than normal conditions will continue over the southern Plains behind the intensifying low pressure system. Meanwhile, continued dry and breezy conditions will keep the fire risk elevated across southern California through the weekend. Over the Pacific Northwest, the next wave of moisture is forecast to arrive Sunday night. Snow should reach the interior mountains by Monday morning as winds and rain will likely increase near the coast where a frontal system will be ready to move onshore. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php