Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Sun May 14 2017 Valid 12Z Sun May 14 2017 - 12Z Tue May 16 2017 ...Heavy rain possible over parts of New England Coast... A deepening low pressure center and associated surface front will track northward offshore the Mid-Atlantic Coast to Nova Scotia by early Tuesday morning. Scattered to numerous showers and thunderstorms is forecast for much of the Northeast over the next couple of days as the low skirts by. Periods of heavy rain may be possible for portions of New England, especially across Maine-- flash flooding may occur due to the excessive rainfall expected. Additional upper-level energy over the Great Lakes/Northern Mid-Atlantic will move eastward off Southern New England Coast overnight Sunday. The energy will produce rain over parts of the Great Lakes moving into the Northern Appalachians by Sunday afternoon. Showers and thunderstorms will span from the Northern High Plains to the Upper Midwest as the a front slowly passes through the Northern/Central Plains. More upper-level energy rotating around the upper-level low will move into Central California while deepening as the energy pushes into parts of the Great Basin by Monday. The energy will produce rain and higher elevation snow over parts of the Pacific Northwest into the Northern Rockies and for portions of California and the Great Basin. Campbell/Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php