Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EST Tue Feb 24 2015 Valid 00Z Wed Feb 25 2015 - 00Z Fri Feb 27 2015 ...Wintry mix of precipitation possible Wednesday and Wednesday night from the lower Mississippi valley to the Southeast... ...Below average temperatures expected to continue for much of the central/eastern U.S... A low pressure system off the southeastern U.S. coastline will bring a wintry mix of rain, snow, sleet, and freezing rain to portions of the eastern Carolinas and southern Delmarva region this evening before quickly moving offshore. Another area of low pressure will develop offshore of New England tonight in response to an approaching upper-level disturbance. This system will bring snow to eastern portions of New England overnight into Wednesday morning. A vigorous upper-level disturbance bringing rain and snow to the Four Corners region today will move into the southern plains by Wednesday morning. As the disturbance approaches the Gulf of Mexico, a wave of low pressure will form at the surface along a lingering frontal boundary. North of this developing low pressure system, precipitation will spread across much of the southern plains and lower Mississippi valley by Wednesday morning. During the day on Wednesday, this precipitation will spread eastward along the Gulf Coast, affecting portions of the Southeast and Tennessee valley. While rain and thunderstorms will be possible in the relatively warm and unstable air along the Gulf Coast, colder air in place farther north will allow for a mix of wintry precipitation from northern Texas eastward across the central and northern Gulf Coast states and into portions of the Carolinas. Accumulating snows are forecast in some areas. Please refer to products issued by the WPC Winter Weather Desk for further information on the winter weather threat. Precipitation across the southeastern U.S. will come to an end from west to east Wednesday night into early Thursday as the surface low moves off the southeastern U.S. coast. Precipitation on Thursday morning north of the surface low may spread as far north as portions of the Mid-Atlantic states. Another low pressure system along an Arctic frontal boundary across the northern plains and Midwest will bring snow to areas from the northern Rockies and northern High Plains tonight eastward across the Midwest on Wednesday. As the Arctic front moves southward across the central U.S., upslope flow will produce snow across the central Rockies from Wyoming southward to Colorado on Wednesday. Another Arctic air mass will move into the plains behind this frontal boundary, with temperatures 20 to 30 degrees below average. An Pacific upper-level disturbance and its associated surface low pressure system will bring rain and higher elevation snows to the Northwest on Wednesday. By early Thursday as the disturbance moves inland across the West, scattered snow showers will be common across much of the Intermountain West. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php