After a quiet and rather mild Holiday week for most of the U.S., the next 7 to 10 days will turn much cold and more active especially for those east of the Rockies. Many locations east of the MS River will see the first snowflakes of the season during the next week, too. It is definitely starting to feel and look like Christmas.
Several storm systems will affect the eastern U.S. the next several days. The first is moving out of the lower MS Valley today and into GA by Sunday morning. This system has already delivered much needed rainfall to much of the Deep South and more rain is likely today; especially from SE LA to the Carolinas. A second system, an upper level one, will move out of CO and into SE KS by this evening. An area of rain mixed with snow will develop across NE KS/NW MO and southern IA.
Sunday morning, the upper level system will have moved into southern IL and snowfall will be likely from eastern MN southeastward to the OH River. Rainfall will spread up along the East Coast and into the Mid-Atlantic. The heaviest rainfall (1”-2”) will fall across the FL Panhandle/GA/SC.
By Sunday evening, snow will likely be falling across much of lower MI southward through IN and west through southern WI, IL and eastern MO. 1” snow accumulation line through Sunday evening will stretch from Kirksville, MO-Bloomington, IL-Indianapolis, IN-Toledo, OH and from Grand Rapids, MI to the IL/WI line-Minneapolis, MN-Kirksville, MO. A 3” line will go from Kankakee, IL to Detroit, MI-Lansing, MI-South Bend, IN-Kankakee, IL. Some isolated 6” amounts may occur inside the 3” band.
Rain will continue to spread northward along the eastern seaboard and into southern New England. This will all be due to the above two systems coming together into one well organized one. A new surface low will have developed and be located in western OH by this time with a second coastal low over coastal NC. A deep trough over will be well in place across the East, too, with several upper level waves of energy swinging through.
Monday morning, the surface low will have moved out of western OH and into eastern lower MI with the coastal low rapidly moving NNE into eastern MA. Snowflakes will be falling across much of the East from northern MS/AL northward to the U.P. of MI and west to the MS River. Widespread rain will be occurring across New England and a line of thunderstorms will be exiting south FL.
Tuesday, snow showers will be likely across much of OH and along the western slopes of the Appalachians. A new “Clipper” system will drop out of Canada and into ND/MT/ID/MN. Snow will accompany this system along with another shot of Arctic air. This system will track into the Midwest on Wednesday. The cold front will stretch from the Great Lakes through MO and into the Panhandles of OK/TX. A band of rain and snow will accompany the front as well as the coldest shot of air so far this season.