Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 AM EDT Wed Nov 01 2017 Valid 12Z Wed Nov 01 2017 - 12Z Fri Nov 03 2017 ...Heavy rainfall possible for portions of the southern Plains and central Gulf Coast through Wednesday morning... ...Accumulating snowfall likely for the Northern Rockies and possible from the Plains to the Upper Mississippi Valley... ...Heavy mountain snowfall likely across parts of the Pacific Northwest and northern Rockies... Rain and thunderstorms will linger over portions of the Southern Plains and Central Gulf Coast as a frontal boundary weakens over the area. Pockets of higher rainfall rates along this boundary over eastern Texas and Louisiana may increase the risk for excessive rainfall. The central low pressure and leading edge of the front will continue to lift northeast through the Great Lakes region and into southern Canada. While the precipitation over much of the Midwest/Upper Mississippi Valley will fall as rain, it is forecast to switch over to snow for the arrowhead of Minnesota and northern Wisconsin. This region could see accumulating snow and have winter weather advisories in effect. Cool temperatures from the Ohio Valley to the Northeast today will allow some precipitation mixing with or changing to snow. By Thursday, expect a sharp warm up with temperatures close to 10 degrees above normal ahead of a second system approaching from the west. Along the Rockies multiple waves of energy is forecast to pass through aloft which will help push a cold front through the northern Rockies, northern and central Plains, and the Upper Midwest over the the next few days. Daytime rain and overnight accumulating snowfall will be possible, especially across the northern Plains and the upper Mississippi Valley. Generally, 2 to 4 inches of snow is forecast in the lower elevation of these areas, higher amounts expected in the higher terrain. Behind the front, temperatures will be chilly with afternoon highs around 10 degrees below normal. Out west, a strong upper level system dropping down along the western Canadian coast will return precipitation to much of the Pacific Northwest starting by this afternoon. Expect heavy snowfall in the mountain, particularly the Washington Cascades, with amounts near or exceeding a foot over the next several days. Campbell/Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php