Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 301 PM EST Wed Nov 17 2021 Valid 00Z Thu Nov 18 2021 - 00Z Sat Nov 20 2021 ...Lake effect snow will develop downwind from the Great Lakes tonight into Friday evening... ...Rain and higher elevation snow for the Pacific Northwest starting on Thursday... A front extending from the Lower Great Lakes southwestward to the Southern Plains will move eastward off the East Coast and southward off the Gulf Coast by Friday morning. Mainly rain will develop along the front from Great Lakes to the Lower Mississippi Valley/Western Gulf Coast tonight into Thursday morning. The rain will move eastward off the East Coast by Friday morning. Behind the boundary, lake effect snow will develop over parts of the Upper Great Lakes overnight, with snow showers expanding eastward across Michigan by Thursday evening. Furthermore, lake effect snow will develop downwind from Lakes Erie and Ontario overnight Thursday. Snow will also develop overnight Thursday, over parts of interior New England, while coastal areas will remain rain. On Friday, the lake effect snow ends over the Upper Great Lakes, while lake effect snow continues downwind from Lakes Erie and Ontario through Friday evening. Light snow will also continue over parts of Northern New England through Friday evening. Meanwhile, another front will move onshore over the Pacific Northwest on Thursday afternoon and rushes inland to the Northern Plains/Great Basin by Friday evening. However, ahead of the system, rain and higher elevation snow will develop over the Northwest Coast by Thursday morning and expand into Northern California by Thursday evening. Snow will develop over parts of the Northern Intermountain Region and into parts of the Northern Rockies Thursday evening into Friday evening. A third front, On Friday, moves south out of Western Canada into the Northern Plains, marking the leading edge of much colder air. Elsewhere, easterly flow off the Atlantic will aid in producing showers and thunderstorms over the southern tip of Florida through Thursday evening. Then, the aforementioned East Coast front moves southward over Florida, continuing the showers and thunderstorms into Friday evening. Ziegenfelder Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php