Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 225 AM EST Sun Feb 10 2019 Valid 12Z Sun Feb 10 2019 - 12Z Tue Feb 12 2019 ...Active weather pattern through Monday with a strong low pressure system developing over the Great Plains... The winter storm that is currently ongoing across the northwestern U.S. will continue to produce significant snowfall across much of the Intermountain West through Sunday evening. The next round of winter weather arrives Sunday night for the Pacific Northwest as a second low pressure system tracks towards the coast on Monday. This system should also produce accumulating snow for the lower elevations of Washington state given the cold airmass in place across this region. The greatest snowfall totals through Monday are expected across the Sierra Nevada and the Oregon Cascades, with amounts in excess of two feet possible. Across the central and eastern U.S., clouds and precipitation will be on the increase over the next couple of days as the Canadian surface high slowly exits the East Coast and south-southeasterly flow on the backside of the high advects more moisture northward. This moisture will converge along a frontal zone situated across the Ohio Valley and Mid-Atlantic region, with rain for most areas affected and a wintry mix on the northern edge of the precipitation from Indiana to Pennsylvania. On Monday morning, a strong low pressure system is forecast to develop across the central plains and track towards the Midwest by Tuesday morning. This will enhance the flow of deep moisture from the Gulf of Mexico and result in a swath of heavy rain and some thunderstorms from Louisiana to Kentucky for the beginning of the work week. Flash flooding will be possible across some of these areas, and WPC currently has a slight to moderate risk of excessive rainfall from Arkansas to southwest Ohio. Temperatures are expected to remain well below average from the Pacific Northwest to the Dakotas through Monday, with widespread subzero lows from the northern Rockies to northern Minnesota. After a brief period of cold weather, a return to above normal temperatures are expected from Texas to the southeast U.S. on Monday ahead of the strong storm system across the Great Plains. D. Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php