Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 323 PM EST Sat Nov 07 2015 Valid 00Z Sun Nov 08 2015 - 00Z Tue Nov 10 2015 ...Heavy rain possible along portions of the Gulf Coast and coastal southeastern U.S... ...Heavy snow possible across portions of the northern Intermountain West... ...Above average temperatures expected for the northern plains and Upper Midwest... A frontal boundary will persist in the northern Gulf of Mexico through the next couple days, keeping showers and thunderstorms in the picture for the Gulf Coast and portions of the southeastern U.S. A couple weak waves of low pressure are forecast to develop along the front -- one across the northern Gulf on Sunday -- and another off the coast of South Carolina on Monday. Each of these lows may provide some enhancement to coverage of showers and thunderstorms along the coast in their vicinity. A very moist and unstable air mass being lifted along the front will result in the potential for locally heavy rainfall across portions of the central and eastern Gulf Coast on Sunday, with 2 to 4 inches of rain possible. On Monday, as the area of low pressure develops off the Carolina coast, heavy rain will be possible across eastern portions of the Carolina. A cold front will move into the Pacific Northwest tonight ahead of a amplifying upper-level trough. Numerous showers are occurring this afternoon across the Northwest, and these will continue as the front moves inland tonight. The front will begin to move into the northern Intermountain West late on Sunday, initially bringing a mix of rain and high elevation snows. Sunday night, the atmosphere will cool significantly as the amplifying upper-level trough moves into the region, causing snow levels to lower substantially. Snow will continue through the day on Monday across much of the northern Intermountain West, with precipitation eventually mixing with or changing to snow even in most valleys. Moderate to heavy snow will be possible at times -- more likely with increasing elevation. 4 to 12 inches of snow are possible across much of the northern Intermountain West, with higher amounts possible at the peaks. Snow will also fall farther south in the Sierra Range, with 5 to 10 inch snowfall accumulations also forecast for this area -- with higher amounts again at the peaks. High pressure at the mid and upper-levels of the atmosphere along with warm southwesterly flow at the lower levels will result in above average temperatures for the northern plains and portions of the Upper Midwest on Sunday, where afternoon high temperatures are expected to be 10 to 20 degrees above average. Breezy conditions will also occur in this area as stronger winds above the surface layer mix down toward the ground. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php