Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 329 PM EST Thu Feb 11 2021 Valid 00Z Fri Feb 12 2021 - 00Z Sun Feb 14 2021 ...Significant ice storm to develop over the Mid-Atlantic and the Central Appalachians... ...A series of winter storms will result in widespread snowfall across the higher terrain and into the lowlands of Washington and Oregon through Saturday... ...Bitter arctic air to remain entrenched across the central U.S. and continue expanding south... Bitterly cold air will engulf the Plains with temperatures 30 to 45 degrees below average. A quasi-stationary front will remain along the Gulf Coast and the Southeast through Saturday evening. Moist air will overrun the front and invade the cold air mass, aiding in snow development over parts of the Mid-Atlantic into the Ohio Valley. Simultaneously, areas of rain/freezing rain will develop over parts of the southern Mid-Atlantic into the Central Appalachians on Thursday evening into Friday evening. Rain with embedded thunderstorms will develop over the Southeast into parts of the Western Gulf Coast. On Friday evening into Saturday evening, rain/freezing rain will develop over parts of the Tennessee Valley and continuing over the Central Appalachians into the southern Mid-Atlantic. The freezing rain will lead to hazardous travel conditions, power outages, and scattered tree damage. Meanwhile, the arctic air mass located over the Central U.S. will cover a widespread area from nearly the Great Plains to the Great Lakes. Wind Chill Advisories and Wind Chill Warnings remain in effect and stretch from much of the Northern Plains to the Midwest. The light wind combined with subzero temperatures could make it feel as cold as -50 degrees in some northern spots. This bitter cold can be dangerous and lead to frostbite in less than 10 minutes. Be sure to plan ahead and dress appropriately if spending time outdoors. Impactful winter weather is also a possibility across the Pacific Northwest, lasting through Saturday. A low-pressure system is forecast to enter southern Oregon this evening while simultaneously interacting with very cold air draining into the region. This combination may lead to heavy snow across the typical mountainous locations but in the lowlands. Significant snowfall accumulation will be possible in both Portland and Seattle. Rain/freezing rain could be another threat in lower elevations of northwestern Oregon in particular. Snow and mixed precipitation are expected to spread across much of the Great Basin and into the Rockies as well. This snow will expand onto the Central Plains into parts of the Middle Mississippi Valley. Lake effect snow will impact most of the Upper Peninsula of Michigan, while upper-level dynamics will contribute to snow developing across the rest of Michigan. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php