Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 315 PM EST Fri Feb 08 2019 Valid 00Z Sat Feb 09 2019 - 00Z Mon Feb 11 2019 ...Snow across the Pacific Northwest through tonight is expected spread farther south and east during the weekend... ...Cold weather expected to persist across the eastern two-thirds of the country through the weekend... ...Wintry weather expected to spread rapidly from west to east from the northern Plains to the Northeast on Sunday... An upper-level low is expected to amplify as it rotates near the coast of the Pacific Northwest through the weekend. The dynamic interactions between a sharp arctic front and the amplifying upper low will continue to be the recipe for a snow event to continue across the Pacific Northwest through tonight into early on Saturday. The snow should begin to taper off from north to south on Saturday across Washington state but will overspread much of Oregon and northern California. The snow will then spread into the Sierra Nevada, the Great Basin, and the Intermountain West on Sunday behind a cold front. Much of the northern Rockies will continue to have occasional light snow through the weekend due to the proximity of an arctic front and a low pressure center passing to the southwest. The southern Atlantic coast will enjoy the last taste of spring this Friday afternoon before arctic air pours into the region behind an arctic cold front this evening. This arctic air mass will continue to bring much below normal temperatures for much of the eastern two-thirds of the country through the weekend. The coldest air will remain over northern Montana where sub-zero temperatures are forecast to last through the weekend. By Sunday, an upper-level trough currently bringing rain into central California will reach the central Plains on Sunday. The interaction of this upper trough with an arctic front across the central Plains will begin to bring an increasing chance of wintry weather into the northern Plains and the Midwest on Sunday. A zone of mixed precipitation appears likely across the mid-Mississippi Valley Sunday morning, spreading into the Ohio Valley during the day on Sunday, followed by the Mid-Atlantic Sunday evening. Farther north, snow is expected to spread rapidly from the northern Plains to the upper Midwest Sunday morning, reaching the northern Mid-Atlantic, upstate New York and southern New England by Sunday evening. Meanwhile, rain is expected to expand from eastern Texas towards the Tenessee Valley on Sunday, reaching the southern Mid-Atlantic region by Sunday evening. Rain could be heavy enough to result in flash flooding over parts of the mid-Mississippi Valley on Sunday. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php