Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 328 PM EST Tue Jan 17 2017 Valid 00Z Wed Jan 18 2017 - 00Z Fri Jan 20 2017 ...Heavy snow possible in the Cascades and Sierras... ...Rain/freezing rain possible for interior lower elevations of the Pacific Northwest... ...Heavy rain possible over parts of the Lower Mississippi Valley/Western Gulf Coast and along parts of the West Coast... ...Snow possible over parts of Northern New England... Low pressure over the Lower Great Lakes will move off the Northeast Coast by Wednesday afternoon. The associated front will linger over the Southeast to the Lower Mississippi Valley/Western Gulf Coast through Thursday. Rain will develop over parts of the Great Lakes/Northeast and the Northern Mid-Atlantic/Ohio Valley that will move off most of the Northeast/Northern Mid-Atlantic Coast by Wednesday evening. Snow will also develop over Northern New England through Wednesday evening. In the wake of the system, rain and snow will linger over parts of New England through Thursday. Additionally, showers and thunderstorms will develop along the boundary from the Southern Mid-Atlantic to parts of the Lower Mississippi Valley/Western Gulf Coast that will likewise move off the Southern Mid-Atlantic Coast by Wednesday evening, too. Showers and thunderstorms will remain over parts of the Middle/Lower Mississippi Valley and Western Gulf Coast on Wednesday evening into Thursday. Meanwhile, a deepening upper-level trough will move onshore over the West Coast Wednesday into Thursday. An associated front will move onshore Wednesday evening into Thursday over California/Great Basin. A plume of moisture will accompany the trough that will slowly work southward from the Pacific Northwest to Southern California by Thursday. The system will produce rain and higher elevation snow over the Pacific Northwest on Tuesday evening that will expand inland to the Northern Rockies by Wednesday morning continuing into Thursday. Similarly, the rain and higher elevation snow will move into Northern California/Great Basin overnight Tuesday and into Central California by Wednesday evening. Overnight Wednesday, the rain will move into Southern California. The snow will be heavy over the Sierras and rain/freezing rain will develop over some of the interior valleys of the Pacific Northwest. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php