Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 425 PM EDT Fri May 06 2016 Valid 00Z Sat May 07 2016 - 00Z Mon May 09 2016 ...Heavy rain and highest elevation snow over the Sierras... ...Heavy rain and highest elevation snow over the Wind River, Big Horn, and Laramie Mountains in Wyoming... ...The temperature will be 10 to 15 degrees below average over the Southwest and parts of California... Upper-level low over the Mid-Atlantic will slowly weekend and move out over the Western Atlantic by overnight Saturday. Rain will develop from parts of Northern New England/Northern Appalachians southward to the Carolinas/Central Appalachians on Friday evening that will end over the Carolinas and Central Appalachians by Saturday afternoon. The rain will continue over parts of the Northern Appalachians/New England through Saturday night when the precipitation will merge with the system moving eastward from the Great Lakes. Meanwhile, another upper-level low over California will move to the Central Rockies/Great Basin by Sunday morning. The system will produce rain with embedded thunderstorms from California to parts of the Northern/Central Rockies and the Southwest that will continue over parts of the Central/Northern Rockies and parts of the Great Basin/California through Sunday morning. The rain with embedded thunderstorms will end over the Southwest/Southern Rockies by early Sunday morning. In addition, highest elevation snow will develop over parts of the Sierras and mountains of Wyoming through Sunday. Additionally, a front extending from the Upper Great Lakes roughly southwestward to the Central Rockies will move south and eastward to the Northeast/Mid-Atlantic westward to the Central Plains by Sunday. Showers and thunderstorms will develop along and ahead of the boundary from the Upper Mississippi Valley/Upper Great Lakes to the Central High Plains by Friday evening that will extend from the Great Lakes/Ohio Valley westward to the Central High Plains by Saturday afternoon. by Saturday evening, rain will begin to develop over parts of the Lower Great Lakes and move eastward into the Northeast southward to the Mid-Atlantic by Sunday. Also by Sunday, showers and thunderstorms will move into the Southern Ohio Valley westward to the Central Plains. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php