Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 447 AM EDT Sun Apr 23 2017 Valid 12Z Sun Apr 23 2017 - 12Z Tue Apr 25 2017 ...Heavy rain possible over parts of the Southern Mid-Atlantic and the Southeast... ...Heavy rain possible over parts of the Pacific Northwest... ...Snow for the Northern Rockies and Cascades... Low pressure over the Tennessee Valley and parts of the Southeast will deepen as the storm moves eastward to the Southeast Coast by Monday evening. The system will produce showers and thunderstorms from parts of the Southern Mid-Atlantic to the Tennessee Valley and southward to the Central Gulf Coast that will move to the Southeast Coast by Monday evening. Rain will also develop over parts of the Ohio Valley to the Northern Mid-Atlantic Coast on Sunday evening that will, likewise, move to the Northern Mid-Atlantic Coast by Monday evening. In addition, a weak upper-level low over Southern Florida will move northeastward out over the Western Atlantic by Monday. The storm will produce showers and thunderstorms over Southern Florida through Sunday night. Meanwhile, a front extending from the Upper Great Lakes to the Northern High Plains will move eastward to New England Coast and stretching westward to Upper Mississippi Valley/Northern Plains by Monday evening. The system will produce rain and snow overnight Saturday from the Northern Plains into the Upper Great Lakes through Monday morning when the rain/snow mix will change over to rain over the Upper Great Lakes/Upper Mississippi Valley into Monday evening. Rain and snow will continue over parts of the Northern Plain through Monday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php