Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 259 PM EST Sun Feb 26 2017 Valid 00Z Mon Feb 27 2017 - 00Z Wed Mar 01 2017 ...More snow for the western U.S., and rain and thunderstorms return to the Gulf Coast and southeastern U.S.... As a strong area of high pressure moves eastward and off the Atlantic Coast Monday, expect warm return flow from the Gulf of Mexico to begin advecting moisture across much of the Southern Plains and the Deep South. This warm moisture will combine with a low pressure system moving across Texas and the southern plains. Numerous showers and storms are likely to develop from the Lower Mississippi Valley to the Ohio Valley and Mid Atlantic during the first half of the work week as the associated warm front lifts northward. Some locations will receive in excess of an inch of rainfall by Tuesday morning, especially from southern Arkansas to northern Alabama. Rain and snow will also expand into the Great Lakes Region by mid week as the moisture surge makes it into this region. Another low pressure system and accompanying upper level disturbance has now made landfall along the Pacific Northwest Coast, and will continue to move inland, reaching the Northern Rockies by Monday afternoon. Several other smaller systems will also move inland over the next couple of days and interact with this system. Moisture from this system will fall as snow, with widespread snow expected from the Pacific Northwest to the Northeast Rockies, and southward to the Central Great Basin and Central Rockies over the next couple of days. Winter weather advisories are currently in effect for portions of this area, with up to a foot of snow possible in the highest elevations. Snow will begin tapering off through the day Tuesday as high pressure moves in behind the exiting system. Finally, yet another low pressure system moving inland along the southern California coast tonight will lead to scattered rain showers across portions of southern California through Monday, and then a mix of rain and snow across much of the Southwest U.S. and Southern Rockies Monday through Tuesday. Winter Storm Watches have been posted for the mountains in central Arizona for this event, with up to foot of snow expected above 6000 feet. Wix Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php