Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 327 AM EST Mon Jan 12 2015 Valid 12Z Mon Jan 12 2015 - 12Z Wed Jan 14 2015 ...Snow and ice will spread across the Northeast and northern Mid-Atlantic states on Monday... ...Moderate to heavy snow expected with a storm system strengthening over the Four Corners states... Widespread precipitation will continue to develop over the eastern third of the Nation on Monday...ahead of a cold front pressing southeastward out of the Midwest and a surface low tracking from the Lower Mississippi Valley to the Southeast. Warm Gulf of Mexico air getting pulled northward over a modified Arctic airmass will result in an axis of freezing rain extending from the central Appalachians to southern New England. North of the ice...conditions should remain cold enough to support a swath of mostly light snow accumulations. Precipitation will stay all rain farther south...with the heaviest rains expected over the southern Appalachians and Mid-Atlantic coast. The northern portion of the cold front and precipitation should push offshore by early Tuesday; however...the southern portion of the boundary will be sluggish to clear the Southeast coast...leading to scattered showers across the Southeast and southern Mid-Atlantic states on Tuesday. Behind the front...a fresh surge of Arctic air that already plunged into the north-central U.S. will spread east of the Appalachians. Light rain and higher elevation snow will be possible with energy diving southeastward out of the Pacific Northwest early Monday. As the energy amplifies Monday night into Tuesday...a developing surface low and orographic effects should help produce moderate to heavy snows along the favored terrain of the Four Corners states. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php