Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 239 PM EST Sun Feb 03 2019 Valid 00Z Mon Feb 04 2019 - 00Z Wed Feb 06 2019 ...Heavy rain possible over parts of the Southern California Coast... ...Heavy snow likely over the Sierras, Northern Rockies, and the Upper Midwest... ...Freezing rain possible over parts of the Upper Great Lakes... ...Temperatures will be 10 to 35 degrees below average over parts of the Northern Plains... Upper-level energy over the Intermountain West will weaken while moving northeastward to the Great Lakes by Monday evening. A second upper-level low, over British Columbia, will move southward to Northern California overnight Monday. The systems will produce onshore flow that will aid in producing periods of heavy rain along the California Coast through Tuesday morning. The storms will also produce heavy snow over the Sierras and over the Cascades through Tuesday morning. The heavy precipitation over Southern California will lead to a risk of flash flooding and debris flows, particularly near burn scar areas, Monday and Monday night. The rain and higher elevation snow will continue in the Northern/Central Rockies and the Southwest through Monday evening, before another round of precipitation enters the region. As the second upper-level low moves southward along the West Coast, snow levels over the Pacific Northwest will lower to the coastline from Sunday evening into Monday. A wave of low pressure along a front extending from the Northeast to the Great Lakes then westward to the Northern Rockies will produce snow and rain over parts of the Upper Mississippi Valley/Great Lakes through Monday evening. Freezing rain will be possible on the frozen ground of the Upper Great Lakes, while rain will develop over the Middle Mississippi and Ohio valleys by Monday. Snow will develop over parts of the Northern High Plains within an increasingly cold air mass on Sunday that will expand eastward into the Northern Plains/Upper Mississippi Valley by Monday morning. The snow will continue over the area through Monday evening. Temperatures will drop well below average across the Northern Plains by Monday. Meanwhile, a weak upper-level low over the Southeast will move off the coast overnight Sunday. The energy will aid in strengthening a low pressure system off the Southeast Coast that will slowly move eastward out over the Western Atlantic. Moisture from the Western Atlantic will flow northward and extend into the Southeast, producing rain over parts of the Southeast through Monday evening. A front moving into parts of the Southern Plains/Lower Mississippi Valley will aid in producing rain over parts of the Lower Mississippi/Tennessee Valleys on Monday into Tuesday. Another area of cold high pressure over West-Central Canada will move southeastward into parts of the Plains on Monday into Tuesday bringing cold temperatures over the Plains. By Tuesday evening, another round of snow, sleet, and freezing rain will be possible across the Midwest. Snell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php