Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 256 AM EST Sat Jan 27 2018 Valid 12Z Sat Jan 27 2018 - 12Z Mon Jan 29 2018 ...Heavy rain possible over the Central Gulf Coast and Coastal Carolinas/Northeastern Florida... ...Heavy rains possible over the Olympic Peninsula... ...Heavy snow over the Northern Cascades... ...Snow over the Northern Rockies... A front extending from the Great Lakes southwestward to the Southern Plains will move eastward to off the Northeast/Northern Mid-Atlantic Coast by Sunday evening while remaining over parts of the Southern Mid-Atlantic into the Southeast/Eastern Gulf Coast also by Sunday evening. Moisture from the Western Gulf of Mexico will pool along the boundary aiding in the development of rain from Western/Central Gulf Coast to the Western Ohio Valley/Middle Mississippi Valley that will move eastward and expand northward into the Lower Great Lakes to the Central/Western Gulf Coast by Saturday evening. The rain will be heavy at times over the Central Gulf Coast on Saturday. As the front continues to move eastward, the rain will move off most of the Northeast Coast by Sunday evening. Likewise, the rain along the southern half of the boundary will move eastward into the Southern Mid-Atlantic and the Southeast by Sunday evening, too. Overnight Saturday into Sunday morning, the rain will end over the Central/Western Gulf Coast. Meanwhile, a plume of moisture will stream into the Pacific Northwest/Northern California through to Sunday evening while the axis of moisture moves northward into Southwestern Canadian Coast. The moisture will aid in producing rain and higher elevation snow over the Pacific Northwest/Northern California with snow extending eastward over parts of the Northern Rockies through Sunday morning. As the moisture axis moves northward, the rain and higher elevation snow will end over Northern California overnight Saturday with the rain and higher elevation snow continues over parts of the Pacific Northwest and snow over parts of the Northern Rockies/Northern High Plains. Additionally, upper-level ridging will develop over the Northwest and the snow levels will rise on Saturday into Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php