Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 308 PM EST Sun Feb 21 2016 Valid 00Z Mon Feb 22 2016 - 00Z Wed Feb 24 2016 ...Heavy rain possible from parts of the Southern Plains to parts of the Southern Appalachians... ...Snow will develop over parts of the Central/Southern Rockies into parts of the Southern High Plains... A quasi-stationary front extending from the Mid-Atlantic southwestward to the Southern Plains will slowly sink southward to the Carolinas westward to the Southern Plains by Tuesday. Moisture will pool along the boundary aiding in the development of showers and thunderstorms from the Southern Plains to parts of the Southern Mid-Atlantic on Sunday evening. Rain will develop along the eastern portion of the front from Monday evening into Tuesday, while showers and thunderstorms will continues from the Central Gulf Coast to the Southern High Plains. In addition, upper-level energy moving over the Great Lakes will produce light snow over parts of the Upper Mississippi Valley into the Upper Great Lakes Sunday into Monday evening. Meanwhile, a weakening front over the Northwest will dissipate by late Sunday evening. The upper-level energy associated with the system will move inland and aid in digging a deep upper-level trough over the Plains by Tuesday. Onshore flow will aid in producing coastal rain and higher elevation snow over parts of the Pacific Northwest through Monday evening. As the energy moves eastward, snow will develop over parts of the Northern Intermountain Region/Northern Rockies by Monday morning. The snow will extend southeastward into parts of the Central/Southern Rockies Monday into Tuesday. The snow will end over Northern Intermountain Region/Northern Rockies by Tuesday morning. Additionally, snow and lower elevation rain will develop over parts of the Southern High Plains Monday evening into Tuesday. As the upper-level energy digs a deep trough over the Plains, moisture from the Western Gulf of Mexico will move northward over the Southern Plains from Monday afternoon into Tuesday. The moisture and the energy will aid in developing showers and thunderstorms with light to moderate rain over parts of the Southern Plains by Tuesday morning. Furthermore, upper-level impulses will move out of South-Central Canada over the Northern Plains into the Upper Great Lakes Sunday evening into Tuesday. The energy will trigger light snow over parts of the Northern Plains by early Monday morning that will move into parts of the Upper/Middle Mississippi Valley by Tuesday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php