Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 224 PM EST Fri Dec 14 2018 Valid 00Z Sat Dec 15 2018 - 00Z Mon Dec 17 2018 ...Excessive rainfall possible over parts of Southeast into the Mid-Atlantic... ...There is a slight risk of severe thunderstorms over parts of northeastern Florida... ...Moderate to heavy snow for the Northern Cascades... ...Heavy rain possible over parts of the Ohio Valley into the Mid-Atlantic and parts of Northern California... A storm over the Lower Mississippi Valley will move northeastward to the Mid-Atlantic by Sunday. The system will produce showers and thunderstorms along and near the associated front from parts of the Tennessee Valley into parts of the Southeast that will move off the Southeast Coast by Saturday afternoon. Rain will develop over parts of the Lower/Middle Mississippi Valley eastward into Mid-Atlantic/Southeast that will end over the Lower/Middle Mississippi Valley by Saturday evening. The rain will slowly end over the Southeast by overnight Saturday, while the rain will continue over parts of the Eastern Ohio Valley/Northern Mid-Atlantic through Sunday. In addition, upper-level energy over Southeastern Canada will move eastward over Northern New England and out over the Western Atlantic by Saturday night. The energy will aid in producing rain and snow over parts of the Lower Great Lakes into Northern New England ending by Saturday morning. Meanwhile, a front over the West Coast will move eastward to the Upper Great Lakes/Middle Mississippi Valley into parts of the Central Plains/Northern High Plains by Sunday. The system will produce rain and higher elevation snow over parts of the Pacific Northwest into Northern/Central California that will move into the Northern Rockies and wane on Saturday morning. Moisture ahead of the next front will aid in producing rain along the Northwest Coast into the Northern/Central California Coast by early Sunday morning. As the moisture moves inland, the rain expands eastward into the Northwest and snow will develop at higher elevations by Sunday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php