Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 219 AM EST Sun Nov 18 2018 Valid 12Z Sun Nov 18 2018 - 12Z Tue Nov 20 2018 ...Light snow possible across parts of the Great Lakes and the Northeast as well as parts of the Northern Plains... ...Red flag warning in Central California in effect with elevated fire weather risks... ...Air Stagnation and Air Quality Alerts continue to be in effect for parts of the Pacific Northwest and California... A front extending from the Ohio Valley/Central Appalachians southwestward to the Southern Plains will move off the Northeast/Northern Mid-Atlantic Coast by Monday evening. The central/southern part of the boundary will move eastward to the Central Appalachians to the Central Gulf Coast and off the Western Gulf Coast by Monday evening, too. Rain and snow will develop just north of the front from the Middle Mississippi Valley to the Lower Great Lakes that will move into the Northeast overnight Sunday and moving off the Northeast Coast by Monday evening. The rain and snow areas will change over to all rain from the Middle Mississippi Valley to the Ohio Valley by Sunday evening. The rain will expand into parts of the Northern Mid-Atlantic overnight Sunday as well. In addition, rain will develop along the boundary from parts of the Middle Mississippi Valley into parts of the Southern Plains that will move eastward to the Tennessee Valley to parts of the Central Gulf Coast by Monday evening. The rain will move out of the Middle Mississippi Valley by Monday evening while extending from the Ohio Valley into parts of the Mid-Atlantic overnight Monday into Tuesday. An area of showers and thunderstorms will develop over parts of the Western Gulf Coast on Sunday that will be move southeastward off the Western Gulf Coast by Monday evening. Meanwhile, a second front over South/Central Canada will move southeastward to the Great Lakes/Northern New England to the Middle Mississippi Valley/Central Plains with a warm front over parts of the Northern Plains by Monday evening. Light snow will develop over parts of the Upper Great Lakes by Sunday afternoon and parts of the Northern Plains by Sunday evening. By Monday afternoon snow will enter Northern New England. By Monday evening snow will extend from parts of the Northern Plains into the Great Lakes and Northern New England. A red flag warning is in effect for the Sacramento area. Low relative humidities and gusty winds will contribute to the fire weather conditions. Elevated fire weather risk will also continue into Sunday for Central/Southern California. As the wildfires continue to burn across California, air quality alerts will persist until the fires are extinguished. Farther north in the Pacific Northwest, air stagnation alerts will continue through Tuesday as the upper-level ridging continues. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php