Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 322 PM EST Mon Feb 15 2021 Valid 00Z Tue Feb 16 2021 - 00Z Thu Feb 18 2021 ...Millions of Americans are currently under Winter Storm Warnings, Ice Storm Warnings, Winter Storm Watches, or Winter Weather Advisories as impactful winter weather continues from coast-to-coast... ...Major winter storm to spread heavy snow and significant ice accumulations from Tennessee/Ohio Valleys to the Northeast... ...Frigid Arctic air and dangerously cold wind chills to persist in the Great Plains and Mississippi Valley through midweek... ...Severe thunderstorms, heavy rain, and warm temperatures are expected for southern Georgia and Florida... An active weather pattern will continue produce unprecedented winter weather across parts of the southern CONUS. Winter Storm Warnings/Advisories and Ice Warnings extend from eastern/southern Texas through the Mississippi/Ohio/Tennessee Valley, Mid-Atlantic and Northeast. A major winter storm will continue to spread heavy snow across parts of the Midwest and interior Northeast tonight before receding into the Northeast on Tuesday. A wide swath of 4-8 inches of snow will fall from the Ohio Valley to Maine while some isolated areas, particularly points downwind of Lakes Eerie and Ontario, may get up to a foot of snow by Wednesday. Freezing rain will be a concern for parts of the Ohio Valley through parts of the coastal Northeast. An area of 0.1 inches of ice may accumulate from central Pennsylvania up to southern New England and eastern Maine. Heavy rain is expected to spread across the eastern seaboard through tomorrow afternoon. Rainfall totals around an inch are possible across the Carolina Piedmont and Northeast. Isolated to scattered thunderstorms are likely to occur over much of the southeast tonight. Severe thunderstorms are concern over parts of southern Georgia and northern Florida, where a tornado watch is in effect. Another system, currently in the Rockies, will move into the Southern Plains tomorrow. This system will spread heavy snow from the Rockies today into the Southern Plains and Lower Mississippi Valley on Tuesday and Wednesday. Freezing rain will impact an aerial swath extending from eastern Texas to southwestern Tennessee late Tuesday. Snow totals for the Central/Southern Rockies may range between 8-12 inches with 1-2 feet possible over the highest peaks through Tuesday. Between 4-8 inches of snow are likely to fall over much of Oklahoma, Arkansas and southern Missouri starting Tuesday night and extending through Wednesday. An area of 0.25 inches of freezing rain may develop across the eastern Texas/northern Louisiana region tomorrow. Windy conditions will continue across the Northern/Central Plains as the pressure gradient tightens out ahead of the aforementioned system. Troughing in the west will lead to significant snowfall over the mountains of the Pacific Northwest and Northern Rockies. Between 1-2 feet of snow is likely to fall over this area with the highest peaks likely to receive between 2-4 feet of snow through Wednesday. Anomalously cold air will sit over the Plains and Mississippi Valley through Wednesday before high pressure begins to move east. Widespread hi/lo records are expected to be broken tomorrow and Wednesday across the Southern Plains and Lower Mississippi Valley where highs and lows may reach between 40-50 degrees below average. Kebede Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php