Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 253 PM EST Sat Jan 12 2019 Valid 00Z Sun Jan 13 2019 - 00Z Tue Jan 15 2019 ...Major winter storm to impact the Middle Mississippi Valley to the Mid-Atlantic with heavy snow and significant rain/freezing rain... A significant winter storm over the Lower Mississippi Valley will move eastward to off the Mid-Atlantic Coast by Sunday evening. The system will produce snow from parts of the Central Plains/Middle Mississippi Valley eastward to the Mid-Atlantic, with heavy snow developing over parts of the Mid-Atlantic early Sunday morning becoming light snow over the region by Sunday afternoon. The snow will end over the Central Plains by Sunday morning and over the Middle Mississippi Valley/Western Ohio Valley by Monday morning. The light snow will taper off over the Mid-Atlantic on Monday, while continuing over parts of the Central/Southern Appalachians. In addition, rain/freezing rain will develop over parts of the Central/Southern Appalachians overnight Saturday that may expand onto the Piedmont of the Mid-Atlantic early Sunday morning into Sunday. The rain/freezing rain will end over the region by afternoon on Sunday. Furthermore, rain will develop over parts of the Middle/Lower Mississippi Valley into the Southern Ohio Valley and Tennessee Valley that will expand into the Southeast/Southern Mid-Atlantic overnight Saturday into Sunday morning. The rain will end over the Lower Mississippi Valley by late Saturday night and the Southeast/Southern Mid-Atlantic by Monday morning. Rain will linger over parts of the Tennessee Valley on Monday. The storm will produce hazardous travel over the region for the duration of the storm. Meanwhile, upper-level energy over Southern California will move eastward to the Southern Rockies while weakening by Sunday night. The system will produce rain and higher elevation snow over parts of Southern California that will move into the Southwest overnight Sunday. The rain and higher elevation snow will end over Southern California overnight Saturday. On Sunday, the snow over the higher elevations of the Southwest will expand into the Southern Rockies. The snow and lower elevation rain will end over the Southwest/Southern Rockies overnight Sunday. Additionally, a developing upper-level low off the California Coast will try to move onshore over Southern California overnight Sunday. A broad region of moisture will move into the California Coast that will aid in producing rain over parts of the coast late Sunday evening into Sunday night. Overnight Sunday into Monday, the rain will expand inland over California. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php PLEASE NOTE: WPC is experiencing problems in processing forecast weather grids from the National Digital Forecast Database. Please refer to https://digital.weather.gov/ and view "Weather" for the latest forecasts until this problem is resolved.