Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 419 AM EDT Fri Apr 22 2016 Valid 12Z Fri Apr 22 2016 - 12Z Sun Apr 24 2016 ...Heavy precipitation possible over parts of the Absaroka Range in Montana... ...Heavy precipitation possible over parts of the Sierras... A front extending from the Lower Great Lakes southward to the Western Gulf Coast will slowly move off the East Coast mainly by Saturday morning. Showers and thunderstorms will develop along and ahead of the boundary from the Ohio Valley to the Lower Mississippi Valley and the Western Gulf Coast will move to parts of New England to the Southern Mid-Atlantic Coast/Southeast Coast by Friday evening. The showers and thunderstorms will move off the coast by Saturday morning. Meanwhile, a deep upper-level low just off the Northwest Coast will move inland to the Northern Rockies by Saturday evening. Rain will develop along the Northwest Coast into Northern and Central California through Saturday evening. As the system moves inland, rain with embedded thunderstorms will develop over parts of the Northern Intermountain Region/Northern Rockies by Friday evening that will expand into parts of the Central Rockies and Northern High Plains by Saturday evening. Snow will also develop over the highest elevations of the Northern/Central Rockies and Sierras. In addition, rain will develop over parts of the Upper Mississippi Valley/Upper Great Lakes by Saturday afternoon into evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php