Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 PM EDT Tue Oct 11 2016 Valid 00Z Wed Oct 12 2016 - 00Z Fri Oct 14 2016 ...Snow possible over parts of the Northern High Plains/Northern Rockies... ...Temperatures will be 10 to 25 degrees below average over the Northern Plains into parts of the Northern Rockies... ...The Pacific Northwest, Northern California and the Intermountain West will transition to a wet pattern... Cold air will continue to surge into the Northern Rockies and the surrounding High Plains as a cold front tracks eastward through the Upper Midwest and Midwest - much of this region could see a mix of rain and snow, or all snow over the next couple of days. Locations along and ahead of the front, primarily areas spanning from the Upper Great Lakes to Oklahoma, will have scattered to widespread showers, with a few thunderstorms possible. The southern flank of the front will slow near portions of southern Rockies/Plains and will provide a focus for slow moving storms to develop - which may result in heavy rainfall along the Texas and Oklahoma border by Friday morning. Onshore flow off the Western Gulf of Mexico will aid in producing showers and thunderstorms over parts of the Western Gulf Coast Tuesday afternoon into late Wednesday afternoon. Similarly, onshore flow off the Atlantic will produce showers and thunderstorms over parts of eastern Florida through Wednesday evening. Cool and mostly dry conditions are expected along the Eastern third of the country through the end of the work week. Surface high pressure is expected to remain in place, but will slowly weaken as the cold front over the central CONUS approaches. A deep upper-level low over the Gulf of Alaska will send a series of systems toward the Pacific Northwest Coast. Very moist, onshore flow will overspread much of the Northwestern states and expand into the northern portions of the Great Basin and Intermountain West by the end of the week and through the weekend. Steady rainfall, likely heavy at times, is forecast for coastal areas of Washington and Oregon by overnight Wednesday/Thursday morning - spreading east of the Cascades into the Northern Rockies Thursday night/Friday morning. Snow will be possible in the favored areas of higher terrain. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php