Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 347 AM EDT Mon Apr 17 2017 Valid 12Z Mon Apr 17 2017 - 12Z Wed Apr 19 2017 ...Heavy snow possible for parts of the Sierras... A front extending from the Northeast to the Southern High Plains is forecast to track offshore the Northeast/Mid-Atlantic Coast by this evening while the second part of the boundary extends westward from the Southern Mid-Atlantic to the Central Plains by Tuesday. Along this boundary showers and thunderstorms are expected to develop over the Southern Mid-Atlantic to parts of the Southern Plains/Lower Mississippi Valley through Tuesday. Light rain will also develop over parts of the Northeast and Lower Great Lakes on Monday into Tuesday. Some snow will develop over Northern Maine Monday evening into Tuesday, too. Rain and mountain snow will spread from the West Coast to portions of the Intermountain West and Great Basin today as a Pacific front moves inland. Portions of the Sierras could have periods of heavy snowfall through Tuesday. The front is expected to cross the Rockies this afternoon and advance through the Northern/Central Plains and into the Upper Midwest by midweek-- spreading rain and snow with it. Another front will push southward from Canada over the next few days which will reinforce the cooler airmass across the northern-tier states. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php