Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 303 AM EST Sat Jan 30 2021 Valid 12Z Sat Jan 30 2021 - 12Z Mon Feb 01 2021 ...A storm system will produce accumulating snow over the Ohio Valley Saturday through Monday and expand east across the Central Appalachians into the Mid-Atlantic overnight Saturday and Sunday... ...Heavy rain to develop over parts of Northern California... ...Areas of rain/freezing rain over parts of the Middle Mississippi Valley into the Ohio Valley and over parts of Virginia and North Carolina on Saturday and Sunday... A storm exiting the Rockies will emerge across the Central High Plains eventually moving eastward to the Mid-Atlantic Coast by Monday morning. As the system moves out of the Rockies and into the Plains, moisture from the Western Gulf of Mexico will move northward over the Southern Plains into the Mississippi Valley with rain expanding into the Middle/Lower Mississippi Valley by this afternoon. The rain will move eastward into parts of the Ohio/Tennessee Valley overnight and into the Southeast/Mid-Atlantic by Sunday morning. Meanwhile, snow will develop over parts of the Northern Plains/Upper Mississippi Valley through today. By this evening, the snow will expand into parts of the Upper Great Lakes and the Ohio Valley. Along the rain/snow line, rain/freezing rain areas will also develop from the Middle Mississippi Valley into the Ohio Valley and into the Central Appalachians and adjacent foothills. Overnight, snow will move into southern portions of the Mid-Atlantic. There will be areas of rain/freezing rain over parts of western Virginia and North Carolina on Sunday. While the snow will wane over the Upper Midwest overnight Sunday, it will continue over the Ohio Valley, parts of the Great Lakes, and into the Mid-Atlantic through Monday morning. The rain over the Southeast will shift offshore by Monday morning. Meanwhile in the West, multiple fronts will move into the Pacific Northwest/Northern California today. The boundaries will have a plume of moisture associated with them, streaming moisture into the Northwest/Northern California. The systems will produce rain and higher elevation snow over the Pacific Northwest and Northern California, continuing through Monday morning. The rain will be heavy over parts of Northern California. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php