Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 248 PM EST Tue Dec 03 2019 Valid 00Z Wed Dec 04 2019 - 00Z Fri Dec 06 2019 ...There is a slight risk of excessive rainfall over parts Southern California... ...Snow for the Southern Sierra Nevada mountains... Deep upper-level low over the Eastern Pacific will move onshore over Southern California on Wednesday moving inland to the Texas Panhandle by Thursday evening. A plume of moisture associated with the system will move into Southern California overnight Tuesday through Wednesday afternoon before waning. The system will produce heavy rain and higher elevations snow to parts of Southern California through Thursday morning. The heavy rain will aid in producing scattered areas of flash flooding, on Wednesday into Thursday morning, where the flash flooding will be mainly localized and near burn scares. Overnight Wednesday, the system will move eastward producing lower elevation rain and higher elevation snow over parts of the Great Basin/Southwest that will move into parts of the Central/Southern Rockies on Thursday into Thursday evening. Additionally, onshore flow off the Pacific will aid in producing rain and highest elevation snow over parts of the Pacific Northwest through Wednesday morning as the flow becomes parallel to the coast. Scattered area of snow and lower elevation rain will develop over parts of the Northern Intermountain Region through Thursday. Meanwhile, upper-level energy will move over the Great Lakes on Tuesday evening through early Thursday morning. The energy will move off the Northeast Coast on Thursday. The system will produce lake enhanced snow over parts of the Great Lakes through Thursday. Overnight Tuesday the lake enhanced snow will move into the Lower Great Lakes and into parts of the Central/Northern Appalachians that will begin to wane on Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php