Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 259 AM EST Thu Nov 07 2019 Valid 12Z Thu Nov 07 2019 - 12Z Sat Nov 09 2019 ...Lake effect snow downwind from the Great Lakes... ...Temperatures will be 10 to 25 degrees below average east of the Missouri River and east of the Central/Southern Rockies to the Great Lakes/Ohio Valley... Air Stagnation Advisories over parts of the Pacific Northwest to the Northern Intermountain Region... A strong cold front extending from the Lower Great Lakes southwestward to the Southern High Plains will move eastward off the East Coast and southward off the Gulf Coast by Friday morning. The front will be followed by an area of cold high pressure moving from the Central Plains to the Mid-Atlantic by Saturday. Rain will develop along the front from parts of the Southern High Plains to the Ohio Valley with snow developing over parts of the Great Lakes on Thursday. As the front moves eastward, rain will develop over parts of the Northeast and snow developing over parts of the Lower Great Lakes into parts of Northern New England by Thursday evening. Rain will move into the Western Gulf Coast and into parts of the Southeast to the Mid-Atlantic, also by Thursday evening. Overnight Thursday, the rain and snow will mostly come to an end over the Northeast and Northern Mid-Atlantic. The rain will end over the Western/Central Gulf Coast and most of the Southeast by Friday evening. In the wake of the front, temperatures will be 10 to 25 degrees below average east of the Missouri River and east of the Central/Southern Rockies to the Great Lakes/Ohio Valley. In addition, lake effect snow will also develop in the wake of the boundary downwind from the Great Lakes on Thursday into Friday evening. Snow will also develop over parts of the Central Appalachians on Thursday evening into Friday morning. Meanwhile, a weak front will approach the Upper Mississippi Valley/Upper Great Lakes on Friday evening into Saturday producing light snow over parts of the Upper Mississippi Valley into the Upper Great Lakes. Air quality will continue to remain an issue across interior portions of the Pacific Northwest and the Northern Intermountain Region into Friday morning, followed by improving conditions as improved atmospheric mixing takes place. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php