Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 334 PM EST Mon Feb 11 2019 Valid 00Z Tue Feb 12 2019 - 00Z Thu Feb 14 2019 ...More widespread snowfall moving into the Northwestern U.S... ...A winter storm expected to impact much of the northern to northeastern U.S... ...Heavy rain expected for the mid-Mississippi, Tennessee, and Ohio Valleys where flash flooding is possible... A very active weather pattern is expected to impact many areas across the country for the next few days with two winter storms brewing concurrently. A low pressure system that developed yesterday along an arctic front off Vancouver Island is already bringing a new round of snow into the Pacific Northwest. With cold air already in place over a fresh snow cover from the previous snowstorm, conditions favor additional snow to accumulate even down into the lower elevations as the moisture associated with the low is forecast to linger through much of Wednesday. The higher elevations will see copious amounts of snow, likely measured in feet, all along the Cascades, and once again down along the Sierra Nevada! The Intermountain region into the northern Rockies will likely see 2 feet of snow at the highest elevations through Wednesday. By Wednesday, moisture associated with the low pressure/frontal system currently impacting Hawaii with high winds and significant waves is forecast to reach northern California. This system will likely bring the next round of moderate to heavy rain into California along with heavy snow once again up across the higher terrain on Wednesday. Meanwhile, a low pressure system developing over the central Plains is forecast to bring widespread wintry weather moving rapidly across the northern and northeastern U.S. during the next couple of days. More than a foot of snow is forecast for upper Midwest with lesser amounts over the northern Plains and into the Great Lakes. The storm is forecast to become more intense on Tuesday as it heads towards New England Tuesday night. More than a foot of snow is forecast for northern New York and northern New England through Wednesday as the storm center moves across these areas. In addition, significant amounts of sleet and freezing rain are also expected farther to the south from the Midwest through the lower Great Lakes, down into the central Appalachians and into central New England. Farther to the south in the warm sector of the storm system, an enhanced southerly flow of deep moisture from the Gulf of Mexico will result in a swath of heavy rain and some thunderstorms from the mid-Mississippi Valley across the Tennessee and Ohio Valleys through Tuesday. Flash flooding will be possible across some of these areas as rounds of heavy rain move over the same areas repeatedly, and WPC currently has a slight to moderate risk of excessive rainfall from Arkansas to southern Ohio. Several inches of rainfall will be possible for some areas before the event is over by Tuesday evening. The southern Appalachians could also see some flooding issues on Tuesday before the storm pulls away Tuesday night. Kong/Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php