Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 212 AM EST Fri Nov 16 2018 Valid 12Z Fri Nov 16 2018 - 12Z Sun Nov 18 2018 ...Early season winter storm to bring snow, sleet, and freezing rain to the Northeast with the addition of gusty wind and coastal flooding... ...Heavy snow possible for parts of the Northern Plains... ...Air Stagnation and Air Quality Alerts for parts of the Northwest and California... Low pressure along the Northeast Coast will move northeastward to the Northern Atlantic by Saturday evening. The system will produce coastal rain and interior snow over parts of the Northeast/Northern Mid-Atlantic with pockets of rain/freezing rain ending by Friday evening. In addition, upper-level energy over the Great Lakes will move quickly eastward off the Northeast Coast overnight Friday. The energy will aid in producing snow over the Great Lakes into the Lower Great Lakes and Northern New England, ending over the Great Lakes by Friday evening and over Northern New England by Saturday morning. A third area of upper-level energy over the Northern High Plains will move southeastward to the Middle Mississippi Valley by Saturday morning and weaken over the Lower Great Lakes by Saturday evening. The system will produce an area of snow and rain over parts of the Northern Rockies/Northern High Plains that will expand into parts of the Northern Plains/Upper Mississippi Valley by Friday evening. The snow will expand into parts of the Great Lakes by Saturday morning, ending by Saturday evening. The snow will end over the Northern Plains into the Upper Mississippi Valley by Saturday afternoon. Overnight Saturday, snow will move into parts of the Central Rockies with a narrow swath of snow extending from the Central Plains across the Middle Mississippi/Ohio Valleys into parts of the Northeast. Meanwhile, rain over parts of the Pacific Northwest Coast will come to an end by Friday evening as upper-level ridging builds over the area. Overnight Friday, moisture from the Western Gulf of Mexico will start of moisten the air over the Western Gulf Coast so by Saturday night into Sunday, showers and thunderstorms will develop over parts of the Western Gulf Coast. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php