Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 300 PM EST Mon Nov 26 2018 Valid 00Z Tue Nov 27 2018 - 00Z Thu Nov 29 2018 ...Heavy snowfall impacts parts of New England through Tuesday, with additional snowfall expected downwind of the Great Lakes... ...Heavy precipitation continues through the short range period for the Pacific Northwest and northern California... ...Well below normal temperatures likely across parts of the Midwest... The system that dropped over a foot of snow across parts of the Mississippi Valley and the Upper Great Lakes this past weekend has come to an end across that region with mainly only light snows remaining across parts of the Ohio Valley. Heavy snowfall however will begin impacting parts of New England by tonight as a new surface low develops along the Northeast coastline. Accumulations of 6 to 12+ inches are possible from upper New York state to northern Maine where winter storm warnings and winter weather advisories are in effect. The backside of this system will feature a lake effect snow event, as cold air moves over the still relatively warm lake surfaces. Significant accumulations of 10+ inches may be possible in the most persistent bands, especially for locations downwind of Lakes Erie and Ontario. This is expected to persist through the middle of the week. Across both regions - New England and the Great Lakes - gusty winds combined with heavy snowfall will result in hazardous travel conditions. The next round of heavy precipitation has pushed into the Pacific Northwest today, eventually extending southward into northern California by Tuesday and Wednesday. Heavy to excessive rainfall is possible, and WPC has highlighted parts of the region within a marginal risk for flash flooding. Accumulating snow and ice are possible for portions of the Washington Cascades where winter weather advisories are in place, with mountain snows also possible into the Intermountain West. Energy from this system pushes into the northern Plains by Wednesday where some light snow or freezing rain is possible. Regarding temperatures across the country, a strong front banked up against the continental divide separates below to well below normal temperatures across the Central and Eastern states, and above normal temps in the West. Much of the west will remain near or above average through the short range, with the warmest temperatures expected across the High Plains where afternoon highs could be 10 to 20 degrees above normal by Wednesday. Meanwhile to the east of the front, surface high pressure prevails resulting in below to well below normal values through mid-week. Places from the central Plains to the central Appalachians could be 20 to 30 degrees below average for this time of the year. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php