Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 419 PM EDT Sun Oct 02 2016 Valid 00Z Mon Oct 03 2016 - 00Z Wed Oct 05 2016 ...Heavy rain possible over parts of the Northern Rockies/High Plains... ...Temperatures will become 10 to 15 degrees below average over parts of California into the Great Basin and the Northern Rockies... A deep upper-level low over the Pacific Northwest/Northern California will move northeastward to the Northern High Plains by Tuesday. The system will produce rain and thunderstorms from parts of the Pacific Northwest/Northern California eastward to the Northern/Central High Plains and the Southwest that will slowly move to the Plains overnight Monday. Showers and thunderstorms will develop along and ahead of the associated front from the Northern Plains to the Southern Plains starting early Tuesday morning expanding into parts of the Upper Mississippi Valley by Tuesday afternoon. The rain and thunderstorms will end over the Pacific Northwest/Northern California by Monday afternoon while the rain and thunderstorms will continue over parts of the Northern Rockies/Northern High Plains through Tuesday. In addition with the cold trough moving into the West, snow will develop over the highest elevations of parts of the Eastern Great Basin Sunday evening moving into the highest elevations of parts of the Northern/Central Rockies Monday afternoon into Tuesday. Meanwhile, another area of upper-level energy will begin to move onshore over the Northwest by Tuesday morning. A head of the energy, onshore flow will stream moisture from the Pacific into the Pacific Northwest into parts of Northern California Monday evening into Tuesday producing rain over parts of the Northwest/Northern California moving farther inland over the Pacific Northwest by Tuesday. Elsewhere, a weakening upper-level low over the Lower Great Lakes will continue to weaken while moving eastward to the Northeast/Northern Mid-Atlantic Coast by Tuesday morning. The storm will produce rain over parts of the Great Lakes/Ohio Valley into the Northern/Central Appalachians on Sunday evening that will move eastward while waning to parts of the Southern New England and Northern Mid-Atlantic Coast by Tuesday. Additionally, onshore flow off the Atlantic will aid in producing showers and thunderstorms over parts of the Southeast through Tuesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php