Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 436 AM EDT Fri Nov 03 2017 Valid 12Z Fri Nov 03 2017 - 12Z Sun Nov 05 2017 ...Heavy snow possible over the Northern Rockies... ...Heavy rain possible for the Sierras... ...Snow possible for the Cascades and highest elevations of the Sierras... A front extending from the Northern Appalachians/Ohio Valley to Lower Mississippi Valley/Southern Plains will move off the Northeast and Northern Mid-Atlantic Coast by Friday evening and off the Carolinas by Saturday morning. Showers and thunderstorms will develop along and ahead of the boundary from the Southern Ohio Valley to the Lower Mississippi Valley that will move to the Mid-Atlantic to the Lower Mississippi Valley by Friday evening. The showers and thunderstorms will continue over parts of the Lower Mississippi Valley into parts of the Central/Southern Appalachians and the Mid-Atlantic through Saturday evening. In addition, rain will develop along the front from parts of the Lower Great Lakes to the Northern Ohio Valley that will move off the Northeast/Northern Mid-Atlantic Coast by late Friday evening. Meanwhile, another front extending from the Northern High Plains roughly westward to Northern California/Pacific Northwest will slowly move southward to the Central Plains and approximately westward to the Great Basin by Saturday evening. On Saturday into Sunday, a warm front will lift northward over Southern/Central Plains and the Lower/Middle Mississippi Valley into the Ohio Valley. Rain will develop along the boundary from Northern California into the Northern Rockies that will continue over parts of the Great Basin into the Central Rockies into Saturday evening. Snow will develop over parts of the Northern Intermountain Region/Northern Rockies into parts of the Northern High Plains that will continue over parts of the region through Saturday evening. On Friday, light snow will develop over parts of the Northern Plains that will expand eastward into the Upper Great Lakes overnight Friday. Moisture will flow northward over the Middle Mississippi Valley/Great Lakes/Ohio Valley late Friday evening into Saturday evening that will aid in the development of rain and snow over the Middle Mississippi Valley/Ohio Valley and the Great Lakes on Saturday into Saturday evening. In the meantime, onshore flow off the Pacific will aid in developing rain over the Pacific Northwest and snow over the Cascades through late Friday evening when the onshore flow ends. Onshore flow moves into to Northern California Friday afternoon into Saturday morning while the onshore flow moves into Central California on Saturday into Saturday evening. Rain and higher elevation snow will develop over Northern California through Saturday afternoon. Mainly rain will develop over Central California with snow over the highest elevations of the Sierras on Saturday into Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php