Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 PM EDT Sat Apr 11 2020 Valid 00Z Sun Apr 12 2020 - 00Z Tue Apr 14 2020 ...Significant cold and snowfall across the Northern and Central Rockies moving into the Plains... ...Heavy rain and severe weather expected to expand across eastern Texas to the Mid-Atlantic this weekend... ...More record heat across Florida... A cold, Canadian airmass will continue to surge south and east through in the wake of a cold front moving through the Plains ushering in snow and wintry precipiation to much of Rockies and High Plains. Temperatures will fall into the teens this evening for much of the Northern Rockies and adjacent High Plains; which may result in possible tied or new record low records Sunday morning across western Montana. High temperatures will also be well below normal from the Rockies into the central Plains with temperatures during the day below freezing from Billings to Denver to Valentine after a mild Saturday with highs in the 60s. Numerous Winter Storm Warnings and Weather Advisories are in effect from western Montana/Wyoming to north-central Colorado and east to southwest Minnesota; while Winter Storm Watches are in effect from eastern Nebraska to Upper Michigan. Across the South, the environment is shaping up to for a very potent storm system that will produce a myriad of hazardous weather types. Moisture from the Gulf of Mexico will return across the southern Plains as the lingering upper low approaches from the Desert Southwest. A surface low will quickly spin up a low pressure across the Southern Plains and it will deepen as it tracks toward the Mississippi Valley. A widespread strong to severe thunderstorm outbreak can be expected for a vast portion of the South this weekend coupled with an elevated threat for heavy rainfall and flooding concerns. The Storm Prediction Center has a very broad Slight Risk area spanning from eastern TX/OK/KS to central VA/NC. Within that region, the greatest threat for widespread severe storms will span from central Louisiana to north-central Alabama where SPC has identified a Moderate Risk. WPC has highlighted threat areas of heavy rainfall and widespread flooding issues for much of the same region as SPC's severe threat. A Moderate Risk is in effect for northern Mississippi to western NC/VA. It will be very important to remain weather aware the next couple of days. Once the blast of cold air reaches this system in the south/central U.S. it will go through rapid intensification and quickly track north and east spreading precipitation through the Ohio Valley, Great Lakes, Mid-Atlantic and the Northeast. A surge of mild air will result in well above normal temperatures (but with rain/storms) for much of the I-95 corridor especially Monday. Across Florida, temperatures in the 80s/low 90s may again approach record highs. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php