Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 323 PM EST Fri Nov 18 2016 Valid 00Z Sat Nov 19 2016 - 00Z Mon Nov 21 2016 ...Snow over the Upper Midwest will wind down... ...Lake effect snow will develop in the lee of the Great Lakes... ...Temperatures will be 10 to 20 degrees above average over parts of the Northeast and Mid-Atlantic... A front extending from the Great Lakes southward to the Lower Mississippi Valley will move eastward to off most of the East Coast by Sunday morning. The system will produce snow over the Upper Mississippi Valley that will move into the Upper Great Lakes by Saturday morning and winding down over the Upper Great Lakes by Saturday evening. In addition, lake effect snow will develop downwind from the Great Lakes and into the Central Appalachians and parts of the Northern Appalachians on Saturday afternoon into evening. The lake effect snow will wind down on Sunday over the Upper Great Lakes. The lake effect snow will continue over parts of the Lower Great Lakes and into parts of the Northern/Central Appalachians through Sunday evening. Additionally, showers and thunderstorms will develop along and ahead of the front from parts of the Great Lakes to Lower Mississippi Valley/Western Gulf Coast through Friday evening. Overnight Friday the showers and thunderstorms will become rain along the boundary from the Great Lakes to the Lower Mississippi Valley. By Saturday evening, the rain will retreat to parts of the Central Appalachians and parts of the Lower Great Lakes. The rain will move off the Mid-Atlantic Coast and continuing over parts of New England by Sunday morning. Meanwhile, a front over the Eastern Pacific will move onshore over the West Coast overnight Friday moving inland to the Interior Pacific Northwest into Central California by Sunday. A plume of moisture will move into Central/Northern California by Saturday morning moving into parts of Southern California by Sunday morning. Rain will develop over parts of the Northwest/Northern California overnight Friday that will expand inland by Saturday morning. The rain will move into parts of Southern California by Sunday morning. Snow will also develop over the higher elevations of the Cascades on Saturday morning and into parts of the Northern Intermountain Region by Saturday evening. The snow at the higher elevations will continue over the Northern Cascades into the Northern Intermountain Region/Northern Rockies through Sunday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php