Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 252 PM EST Tue Nov 27 2018 Valid 00Z Wed Nov 28 2018 - 00Z Fri Nov 30 2018 ...Heavy snowfall will continue to impact northern New England tonight, with additional lake effect snowfall expected downwind of the Great Lakes through Wednesday... ...Heavy precipitation is expected across the Pacific Northwest and California over the next few days with very heavy snowfall in the Sierra-Nevada... ...Well below normal temperatures are likely across parts of the Midwest and East as temperatures rebound to well above normal over the High Plains... Heavy snow will continue to impact areas of especially northern New England well into the overnight hours as deepening low pressure pivots up across southern and eastern Maine through early Wednesday. The storm will then only slowly exit off to the east and offshore through the Gulf of Maine through Wednesday night. Winter storm warnings and winter weather advisories are in effect locally across this region, and total snowfall amounts of as much as 18 inches are expected before the system begins to exit. In the wake of this system, strong and cold northwest flow over the Great Lakes will lead to heavy lake-effect snowfall downwind of especially Lakes Erie and Ontario, where areas of northwest Pennsylvania and western New York respectively will see as much as a foot of new snowfall going through Wednesday. The snowfall combined with the strong winds are expected to result in hazardous travel conditions. Additionally, much colder temperatures will be advancing from the Midwest to the East Coast with temperatures much below normal for the next couple of days. Meanwhile, a very wet pattern is in store for much of the West over the next few days, including the Pacific Northwest, California, and the northern and central Rockies as a deep atmospheric fetch of Pacific moisture and colder temperatures continues to cross the West Coast and well inland across the Intermountain region. Very heavy snowfall is expected across the Sierra-Nevada with multi-day totals of as much as 2 to 4 feet with isolated heavier amounts over the highest peaks. Heavy snowfall will also occur well inland over the central and northern Rockies with accumulations going through Thursday locally in excess of 1 foot, and more snow likely after this period. In the lower elevations, there will be a concern for heavy rainfall totals and the Weather Prediction Center has highlighted a Marginal Risk of excessive rainfall for portions of northwest California through tonight, and then farther south down across virtually all of the coastal ranges of California through Wednesday, including some of the interior sections of the state. Rainfall amounts locally of as much as 2 to 4 inches will be possible, with the heaviest amounts across the coastal ranges. Some flooding will be possible. Elsewhere, an upper level disturbance and associated surface low will drop southeast from Canada and cross portions of the northern Plains late tonight and then toward the upper Midwest through Wednesday and into early Thursday. This system will bring light snow and freezing rain to portions of the Dakotas and also Minnesota. Temperatures to the south of this system will be rebounding from the recent cold weather, and many areas of the High Plains will see temperatures rise well above normal through Thursday. Orrison Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php