Short Range Forecast Discussion...Corrected NWS Weather Prediction Center College Park MD 542 AM EST Fri Feb 01 2019 Valid 12Z Fri Feb 01 2019 - 12Z Sun Feb 03 2019 ...Heavy rain possible over parts of the California Coast... ...Heavy snow possible over the Sierra Nevada... Upper-level energy over the Upper Mississippi Valley/Upper Great Lakes will move eastward off the Northeast Coast by late Friday night. The energy will aid in producing light snow over parts of the Ohio Valley into parts of the Central Appalachians that will move eastward into the Northern Mid-Atlantic on Friday morning ending by Friday evening. Cold high pressure over the Great Lakes into the Northeast will slowly move eastward out over the Western Atlantic by Saturday evening. Temperatures will continue to moderate with wind chills as low as 10 to 15 degrees below zero on Friday morning. Meanwhile, multiple areas of upper-level energy will flow over the Gulf Coast through Sunday. Moisture from the Gulf of Mexico will flow northward over the Gulf Coast through Sunday. The energy will aid in producing rain over parts of the Southern Plains into parts of the Tennessee and Lower Mississippi Valleys that will continue over parts of the Southern Plains through Sunday. Rain will also develop over parts of the Central/Eastern Gulf Coast Friday afternoon into Sunday, too. A front developing over the Upper Great Lakes on Saturday will move eastward into the Northeast by Saturday evening and off the Northeast Coast by Sunday. The boundary will aid in producing snow over parts of the Upper Mississippi Valley and Upper Great Lakes on Friday afternoon into Friday night. On Saturday, snow will develop over parts of the Northeast waning overnight Saturday. A wave of low pressure over the Northern Plains on Friday evening will move northeastward into the Upper Great Lakes by Sunday. Rain will develop over parts of the Middle Mississippi Valley on Saturday that will move into the Upper Great Lakes/Ohio Valley by Sunday morning. In the meantime, a deep upper-level trough over the Eastern Pacific will begin to move onshore over the West Coast on Friday with an upper-level low moving into California on Saturday morning into Sunday. The trough will contain a plumb of moisture that will move into the California Coast on Saturday that will begin to wane on Sunday. The system will begin to produce rain over parts of the Pacific Northwest/Northern California on Friday morning. The precipitation will move inland to the Northern Intermountain Region by Saturday morning producing rain and higher elevation snow. The rain will also move into California on Friday afternoon into evening. On Saturday, higher elevation snow will develop over the Sierras. Overnight Saturday, the snow levels will lower as higher elevation snow develop over parts of the Great Basin as rain moves into parts of the Southwest. The precipitation will increase significantly on Saturday bringing heavy rain along the California Coast along with very heavy snowfall for the Sierra Nevada. Flash flooding and debris flows will be a concern particularly near burn scar areas over parts of California. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php