Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 215 PM EST Sat Feb 16 2019 Valid 00Z Sun Feb 17 2019 - 00Z Tue Feb 19 2019 ...Heavy snow possible over the Sierra... ...Heavy snow possible over parts of the Northern Plains into the Middle Mississippi Valley... ...Rain/freezing rain possible over parts of the Central Appalachians... A storm over the Southern High Plains will move eastward to the Lower Mississippi Valley before moving northeastward off the Mid-Atlantic Coast by Monday. Energy associated with the system will produce snow over parts of the Northern Plains into the Central Plains as well as snow over parts of the Central/Southern Rockies into parts of the Southwest by Saturday evening. As the system moves onto the Plains, moisture from the Western Gulf of Mexico will flow northward over the Lower/Middle Mississippi Valley that will aid in developing rain over parts of the Western/Central Gulf Coast and expanding into the Tennessee Valley/Southeast, as the snow moves into parts of the Middle Mississippi Valley/Western Ohio Valley overnight Saturday. On Sunday, snow will move eastward into parts of the Great Lakes/Ohio Valley as the rain moves into parts of the Southern Ohio Valley/Tennessee Valley and the Mid-Atlantic. Overnight Sunday into Monday, rain/freezing rain is possible over parts of the Central Appalachians as the snow moves into parts of Southern New England. Overnight Monday, the rain will move off most of the Mid-Atlantic/Southeast Coast. The snow over the Northern Plains to the Great Lakes and New England will begin to tapper off. Meanwhile, a deep upper-level trough over the western third of the country and weak onshore flow will aid in producing snow inland and at higher elevation over the Pacific Northwest and Northern/Central California with rain over the coastal regions of the Pacific Northwest into California. The rain and snow over the Pacific Northwest will start to wane on Sunday as the weak onshore flow ends. An upper-level low will develop over parts of the Great Basin/Southwest overnight Sunday. The snow and rain will end over California by Monday morning. The new storm, will continue to produce snow over parts of the Great Basin into parts of the Central/Southern Rockies into Monday. Higher elevation snow and lower elevation rain will also develop over parts of the Southwest overnight Sunday into Monday. On Monday into Monday evening, moisture will surge into parts of the Western/Central Gulf Coast as rain develops by Monday evening over the area. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php