Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 307 AM EST Sat Feb 02 2019 Valid 12Z Sat Feb 02 2019 - 12Z Mon Feb 04 2019 ...Heavy rain possible over parts of the California Coast... ...Heavy snow possible over the Sierra Nevada, Northern Rockies, and the Upper Midwest... ...Rain falling on frozen ground will produce freezing rain over parts of the Upper Great Lakes... ...Temperatures will be 10 to 20 degrees above average over parts of the High Plains... Multiple areas of upper-level energy will flow over the Gulf Coast through Monday, producing a low off the Southeast Coast overnight Saturday into Sunday. Moisture from the Gulf of Mexico will flow northward over the Gulf Coast extending into the Western Ohio Valley/Upper Great Lakes by Monday. The energy will also aid in producing rain over parts of the Southern Plains into the Lower Mississippi Valley through Monday. Rain will also develop over Eastern Gulf Coast/Southeast on Saturday moving off shore overnight Saturday. Meanwhile, 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. On Saturday, snow will develop over parts of the Upper Great Lakes moving into the Northeast by Saturday afternoon, waning overnight Saturday. A wave of low pressure over the Northern Plains on Saturday evening will slowly move northeastward into the Upper Great Lakes by Sunday evening. 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. The warm rain will fall on frozen ground over parts of the Upper Great Lakes overnight Saturday into Sunday morning producing areas of freezing rain. Snow will also develop over parts of the Upper Great Lakes overnight Saturday into Sunday. Another wave of low pressure over the Northern Rockies/Northern High Plains will move eastward to the Upper Mississippi Valley by Monday. The system will produce snow, heavy at times over parts of the Northern Plains on Sunday that will move into the Upper Great Lakes/Upper Mississippi Valley on Monday. In the meantime, a developing upper-level low over the Eastern Pacific will move onshore over California on Saturday with the energy moving into Northern Plains overnight Sunday into Monday. A plume of moisture will move into the California Coast on Saturday that move into parts of the Southwest on Sunday before waning overnight Sunday into Monday. The Moisture will aid in producing rain and higher elevation snow over the West Coast extending inland to the Great Basin/Northern Intermountain Region on Saturday. The rain and higher elevation snow will expand inland to the Northern/Central Rockies and the Southwest by Sunday morning. Overnight Saturday, the snow levels will lower as higher elevation snow develop over parts of the Great Basin. 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 high concern, particularly near burn scar areas in parts of California. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php