Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 335 PM EST Sat Nov 25 2017 Valid 00Z Sun Nov 26 2017 - 00Z Tue Nov 28 2017 ...Heavy rain and snow for the Sierras... ...Heavy rain possible over the Pacific Northwest... ...Snow possible over the Cascades into parts of the Northern Rockies... A front will move off the Eastern Seaboard by Sunday afternoon. Associated upper-level energy over the Lower Great Lakes/Central Appalachians will move eastward off the Northeast Coast by Sunday evening. The energy will aid in producing rain and snow over parts of the Lower Great Lakes into parts of the Central Appalachians/Northeast on Saturday evening that will change over to all light snow overnight Saturday that will end west to east on Sunday into Sunday evening. Additionally, a clipper system over South-Central Canada will move quickly to Northern Maine by Monday. Overnight Sunday, light snow will develop over parts of the Lower Great Lakes into the Northern Appalachians that will move into Northern New England by Monday while ending over the Lower Great Lakes. Meanwhile, a front off the West Coast will move inland by Sunday afternoon advancing to the Northern High Plains/Northern Rockies into the Great Basin/Southern California by Monday. Ahead of the boundary, light rain will develop over parts of the Pacific Northwest and snow will develop over the highest elevations of the Cascades on Saturday evening that will expand into the Northern Rockies by Sunday morning. As the front begins to move onshore on Sunday, rain will develop over parts of Northern/Central California that will expand inland to the Great Basin overnight Sunday into Monday. With the passage of the front, snow levels will lower over the Cascades, Sierras, and the Northern Rockies overnight Sunday into Monday. On Sunday, snow will develop over the higher elevations of the Sierras and parts of the Great Basin that will lower on Sunday night into Monday. Likewise, the snow levels over the Cascades into the Northern Rockies will lower, too. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php