Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 418 AM EDT Wed Apr 21 2021 Valid 12Z Wed Apr 21 2021 - 12Z Fri Apr 23 2021 ...A low pressure system will continue to bring wet snow across northern New England through Thursday morning... ...Light snow lingers across central Rockies as another surge of cold air brings additional snowfall into the northern Rockies... ...Subfreezing record cold temperatures this morning across much of the south-central U.S. will shift to parts of the eastern U.S. Thursday morning... ...Fire weather threat increasing over the Desert Southwest as well as over the Southeast U.S. coast today... Much of the active weather today will be associated with an intensifying low pressure system which is forecast to move across the central Appalachians and into New England through tonight. A swath of wet snow is expected to expand northeastward near the Canadian border from New York into northern New England through Friday morning as the storm center passes just to the south. Total snowfall amounts of 6 to 10 inches are forecast in these areas with up to 12 inches possible near the northern tip of Maine. Further south in the Mid-Atlantic to southern New England, some showers and embedded thunderstorms are expected this afternoon as a cold front moves quickly through the region. In fact, the Storm Prediction Center has issued a Slight Risk of severe thunderstorms for the Mid-Atlantic coast to southern New England for today. In the wake of the developing storm system, unseasonably cold air will continue to surge into the central U.S. toward the eastern U.S, leading to widespread Freeze Watches and Warnings that cover much of the central U.S., Midwest and the interior eastern U.S. Numerous daily record low temperatures are forecast to be tied or broken this morning and Thursday morning as temperatures dip to below freezing--around 20-25 degrees below average for late April. Residents in these areas are encouraged to take preventative measures to mitigate the impacts of sub-freezing temperatures on vulnerable vegetation if possible. By Friday, the cold airmass will moderate as it drifts east, although low temperatures will remain around 10 degrees below normal in the Central U.S., with lows hovering in the mid-30's to 40's. In the western U.S., a low pressure system will bring lingering light snow across the central Rockies for the next few days while another surge of cold air from western Canada reaches the northern Rockies/High Plains on Thursday. Temperatures will once again tumble, along with a quick burst of snow, as the cold front passes through much of Montana by Thursday evening. The snow should move further south into Wyoming by Friday morning. Meanwhile, active weather across southern Florida is expected to gradually move offshore as drier air arrives behind a front. The dry, windy conditions behind the front are forecast to increase the threat of fire over the Carolinas today. In addition, fire weather threat will be increasing in Desert Southwest over the next three days as low pressure deepens to the north. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php