Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 307 PM EST Sun Nov 08 2015 Valid 00Z Mon Nov 09 2015 - 00Z Wed Nov 11 2015 ...Flash flooding possible across portions of the Southeast... ...Snow expected for much of the Intermountain West... ...Above average temperatures expected to continue for the northern plains and Upper Midwest... A low pressure system is developing this afternoon along a surface frontal boundary in the northern Gulf of Mexico. This system is resulting in widespread rain across much of the southeastern U.S., with areas of thunderstorms across Florida. Rain will continue across much of the Southeast tonight as the surface low moves slowly northeastward toward the Florida Panhandle. Rain will expand into the central Appalachians and much of the Mid-Atlantic region on Monday as an additional surface low develops along the frontal boundary along the coast of the Carolinas. Heavy rainfall amounts of 1 to 4 inches are forecast from eastern portions of the Florida Panhandle northward along the Southeast U.S. coastline to the southern Mid-Atlantic. Flash flooding will be possible in some areas. By Tuesday the surface low will move along the Mid-Atlantic coast, with rain continuing across the Mid-Atlantic through the morning, before tapering off in the afternoon. Rain will persist across portions of New England through Tuesday. A cold front and will move across the Intermountain West ahead of an amplifying upper-level trough. A mix of rain and high elevation snows will fall this evening. The atmosphere will cool significantly as the amplifying upper-level trough moves into the region overnight, causing snow levels to lower. 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 many valleys by late Monday. 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 6 to 12 inch snowfall accumulations also forecast for this area, and across the Wasatch, where lighter amounts of 3 to 6 inches will be common. Snow will begin to taper off across the northern Intermountain West during the day on Tuesday but will pick up across the Colorado Rockies as an upper-level low closes off overhead, and the surface low pressure system reorganizes over the plains. Another Pacific frontal system will approach the Northwest Tuesday afternoon, once again spreading rain into coastal areas with snow for the Cascades. 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 much of the the northern plains and Upper Midwest on Monday, 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