Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 448 AM EDT Sat Nov 04 2017 Valid 12Z Sat Nov 04 2017 - 12Z Mon Nov 06 2017 ...Heavy rain possible from the Ohio Valley to the Lower Great Lakes/Northern Appalachians... ...Heavy snow possible across portions of the Northern/Central Rockies... ...Snow over the Cascades and highest elevations of the Sierras... ...Temperatures will be 10 to 25 degrees below average over parts of the Northern Rockies/Northern High Plains... Upper-level energy over the Middle/Upper Mississippi Valley and the Upper Great Lakes/Western Ohio Valley will move eastward and weaken by Sunday morning. An area of rain and thunderstorms will develop over parts of the Upper Mississippi Valley/Upper Great Lakes into parts of the Western Ohio and Middle Mississippi Valleys that will extend southward to parts of the Lower Mississippi Valley/Tennessee Valley by Saturday evening as showers move into parts of the Mid-Atlantic/Southeast. The area of rain and thunderstorms will remain over parts of the Great Lakes/Ohio Valley into parts of the Mid-Atlantic/Northern Appalachians by Sunday morning. On Sunday a front from the west will catch up to the area of rain and thunderstorms aiding in producing showers and thunderstorms along and ahead of the boundary from the Lower Great Lakes/Northern Appalachians southwestward into the Ohio Valley/Great Lakes and parts of the Middle Mississippi Valley by Sunday evening. Meanwhile, a region of much stronger upper-level energy over the Northern High Plains/Northern Rockies into Northern California will move eastward to the Upper Great Lakes to the Northern High Plains/Middle Missouri Valley by Sunday evening. The energy will induce a front over Upper Great Lakes/Upper Mississippi Valley southwestward into the Central Plains on Sunday morning moving to the Great Lakes/Western Ohio Valley and Middle Mississippi Valley/Southern Plains by Sunday evening into Monday. The energy will aid in producing snow and lower elevation rain over parts of the Northern High Plains/Northern Rockies into the parts of the Great Basin/Northern California that will move into the Northern Plains by Saturday evening. The rain and higher elevation snow over Northern California/Great Basin wanes overnight Saturday as snow and rain moves into the Upper Great Lakes/Upper Mississippi Valley by Sunday morning. The front associated with the energy develops overnight Saturday over the Upper Great Lakes/Upper Mississippi Valley into the Central Plains that will move to the Great Lakes/Western Ohio Valley into parts of the Middle Mississippi Valley/Southern Plains by Sunday evening. The snow wanes over the Upper Midwest on Sunday as rain develop along the boundary becoming showers and thunderstorms over the Great Lakes into the Middle Mississippi Valley by Sunday evening. In the meantime, upper-level energy over the Northeastern Pacific moves into the Pacific Northwest overnight Saturday moving into Northern Rockies/Northern High Plains by Sunday evening. The energy will aid in developing additional rain and higher elevation snow over parts of the Pacific Northwest overnight Saturday into Sunday. On Sunday, snow will expand eastward into the Northern Intermountain Region and the Northern Rockies. Similarly, rain and higher elevations snow will move into Northern California and into parts of the Central Rockies. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php