Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 305 PM EST Thu Nov 18 2021 Valid 00Z Fri Nov 19 2021 - 00Z Sun Nov 21 2021 ...Lake effect snow will develop downwind from the Great Lakes into the interior Northeast ending overnight Friday... ...Rain and higher elevation snow for the Pacific Northwest through Friday evening... A front extending from the Northeast to the Central Gulf Coast will move eastward off the East Coast and southward off the Gulf Coast by Friday morning. Mainly rain will develop along the front from the Northeast to the Central Gulf Coast tonight into Thursday morning. The rain will move eastward off the East Coast by Friday. Behind the boundary, lake effect snow will develop over parts of the Great Lakes. Furthermore, lake effect snow will develop downwind from Lakes Erie and Ontario tonight. Snow will also develop 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. Likewise, the light snow will also continue over parts of Northern New England through Friday evening. Meanwhile, another front moves onshore over the Pacific Northwest, moving to the Northern High Plains/Great Basin by Friday evening. The system will produce rain and higher elevation snow will develop over parts of the Northwest and expand into Northern California overnight Thursday. Snow will develop over parts of the Northern Intermountain Region and into parts of the Northern Rockies through Friday evening. Scattered light rain and higher elevation snow will linger over parts of the Northwest through Saturday. The front moves southeastward to the Southern Rockies and Southern Plains by Saturday evening. Elsewhere, easterly flow off the Atlantic will aid in producing showers and thunderstorms over Florida overnight. Then, the aforementioned East Coast front moves southward over Florida, confining the showers and thunderstorms to the southern third of Florida. However, after the front moves offshore, the easterly flow will again move over Florida producing scattered showers and thunderstorms over parts of the peninsula on Saturday. Ziegenfelder Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php