Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 351 PM EST Fri Feb 16 2018 Valid 00Z Sat Feb 17 2018 - 00Z Mon Feb 19 2018 ...Snow possible for parts of the Central Appalachians/Northern Mid-Atlantic into parts of New England... ...Heavy snow possible for the Cascades and the Northern Rockies... ...Heavy rain possible over parts of the Pacific Northwest... A front extending from the Southern Mid-Atlantic to the Western Gulf Coast will have a wave of low pressure develop over the Central Gulf Coast on Friday evening. The low will move northeastward to the Southern Mid-Atlantic Coast by Saturday evening then move out over the Western Atlantic by Sunday morning. The boundary will settle southward over the Southeast by Sunday morning as well. The system will produce rain over parts of Southern New England/Mid-Atlantic southwestward into the Tennessee Valley and move off most of the Northeast/Northern Mid-Atlantic by late Friday night and off the Southern Mid-Atlantic Coast by Saturday morning. The rain may change over to snow briefly before ending from Southern New England to the Central Appalachians during the evening hours on Friday. Meanwhile, moisture moving northwestward over the Southern Plains from the Western Gulf of Mexico will overrun the boundary over the Western Gulf Coast producing rain over parts of the Southern Rockies into the Southern Plains/Central Gulf Coast on Friday evening. The wave of low pressure begins to move northeastward into the Tennessee Valley, by Saturday as the associated rain moves into parts of the Lower/Middle Mississippi Valley into parts of the Southern Plains by Saturday morning and end over the Southern Rockies/Southern High Plains overnight Friday. The rain will move into the Southern Ohio/Tennessee Valleys on Saturday moving into the Mid-Atlantic by Saturday evening. In addition by Saturday evening, snow will develop over parts of the Northern Mid-Atlantic moving into parts of New England overnight Saturday into Sunday morning. The rain will move off the Mid-Atlantic Coast by Sunday morning while ending over the Southern Mid-Atlantic into the Central Gulf Coast overnight Saturday. Additionally, a front will move southward out of Central Canada overnight Friday moving to the Upper Mississippi Valley/Northern Plains by Saturday morning. The front will continue to move eastward to the Great Lakes westward to a wave of low pressure over the Northern Plains on Sunday morning. Light snow will develop along the boundary by Saturday morning over the Upper Mississippi Valley moving into parts of the Upper Great Lakes by Saturday evening and into parts of the Northeast by Sunday morning. In the meantime, upper-level energy over the Northern Intermountain Region will move quickly to the Northeast Coast by Sunday. Onshore flow and the energy will aid in developing rain over parts of the Pacific Northwest and snow over the Northern Intermountain Region/Northern Rockies of Friday evening. The snow will expand into parts of the Northern High Plains by Saturday morning while the rain continues over the Pacific Northwest. A front with more upper-level energy will approach the Pacific Northwest on Saturday with the boundary moving inland to parts of the Northern Intermountain Region by Saturday evening. The front will move southward over the Northern Rockies into parts of the Great Basin/Northern California by Sunday morning. As the boundary moves inland on Saturday evening into Sunday, the snow levels will lower with snow developing over the higher elevations of the Northwest overnight Saturday with snow developing near the Northwest Coast of Washington State by Sunday. Snow will also develop over parts of the higher elevations of Northern California by Sunday, too. Snow will extend from parts of the Northern Plains to parts of the Northwest by Sunday and rain along parts of the Northwest Coast into the Northern Californian Coast. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php