Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 225 AM EST Mon Nov 13 2017 Valid 12Z Mon Nov 13 2017 - 12Z Wed Nov 15 2017 ...Heavy rain and mountain snows possible for parts of the Pacific Northwest... An unsettled weather pattern is expected across much of the northwestern quadrant of the nation through the middle of the week. Persistent onshore flow will bring showers and higher elevation snows to the Pacific Northwest Sunday night ahead of an approaching surface low and cold front. This storm will strengthen and eventually make its way onshore in British Columbia on Monday, with moderate to heavy precipitation expected from northern California to western Washington. Some of the moisture will reach the northern Rockies by Tuesday as a surface low tracks inland. Temperatures will moderate across much of the Western U.S. ahead of the deep upper trough and will see temperatures rise above normal across the central and southern Plains by Tuesday. Across the eastern U.S., strong high pressure will briefly give way to a weak frontal wave moving from the Plains to the east coast with only light rain expected for some areas. A front moving across the northern Plains with warm air advection ahead of it will likely lead to scattered showers from Missouri to the northern Great Lakes by Tuesday afternoon. High pressure will regain control by Tuesday for the eastern U.S., and although temperatures will remain below seasonal averages, they will not approach the winter like temperatures experienced the previous few days. Krekeler Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php