The latest developments on the storms across the U.S. (all times EST):
Authorities say a man pulled an unloaded gun on a snow plow driver during a road rage incident as the first winter snows fell on Massachusetts.
Police say Michael McCullom had been attempting turn onto North Main Street on Tuesday morning and nearly crashed into a snow plow. The 51-year-old Andover resident then followed the plow into a parking lot where the two drivers had an argument that turned physical.
McCullom pulled out an unloaded firearm and was arrested at the scene after a bystander called police.
He was arraigned on assault and battery and assault with a dangerous weapon charges.
The unidentified snow plow driver also faces charges including assault and battery.
McCullom's lawyer says he was attacked first and pulled out the gun in self-defense.
Drivers in New England certainly didn't miss this: Snow, sleet and freezing rain that are covering the region for the first time this season are sending cars and trucks spinning off roadways.
Tuesday's late start to winter weather is a spinoff from the storms that swept through the Midwest, killing at least 13 people.
In New Hampshire, where up to 10 inches of snow was expected, highway speed limits were lowered to 45 mph as crews kept pace with the mixed bag of misery. Maine also looked to get up to 10 inches, a boon for the ski and winter tourism industries.
Vermont expected 4 to 8 inches of snow.
Connecticut State Police reported at least 50 crashes while commuters in Rhode Island and Massachusetts also contended with sloppy rides.
Authorities say a stretch of Interstate 44 in central Missouri is completely closed because of flooding.
The Missouri State Department of Transportation announced Tuesday morning that the closure is affecting eastbound and westbound lanes just west of Rolla in Phelps County.
Transportation officials say drivers using detour routes should expect delays and longer travel times.
Closures also were a problem Monday, with westbound I-44 traffic stopped in Phelps County and eastbound traffic closed in Laclede County.
More rain is on the way to Alabama, where forecasters estimate that more than 10 inches fell in some spots during a six-day span.
The National Weather Service said rain chances will increase across Alabama late Tuesday into Wednesday morning. Forecasters say the additional rains could lead to some flash flooding across the South.
Rainfall estimates from the weather service show that more than 14 inches of rain fell Dec. 21-26 in parts of eastern Alabama and more than 10 inches fell in northwest Alabama.
Flood warnings are in effect across central and southern Illinois a day after a winter storm brought sleet and icy rain.
The National Weather Service on Tuesday issued flood warnings for areas near Champaign, Charleston, Effingham, Taylorville and Salem.
Major flooding was observed along the Kankakee, Illinois, Sangamon and Vermilion rivers.
The Illinois Department of Transportation said several roadways were closed in southern Illinois because of flooding, including Interstate 70 near Pleasant Mound and roads along the Mississippi River near Chester and the Shawnee National Forest.
The Monday storm brought as much as 3.5 inches of ice accumulation in Rockford and had peak wind gusts of 53 mph in Waukegan.
Ameren Illinois reported about 23,000 power outages, largely in the Galesburg and Peoria area, on Tuesday morning.
Forecasters say more rain is headed to Georgia, where many parts of the state are still dealing with floodwaters from earlier storms.
The National Weather Service says rain is expected to develop early Wednesday, with the heaviest expected over north Georgia.
In a county about 60 miles northwest of Atlanta, divers on Monday recovered the body of a man whose car was swept away by floodwaters.
Forecasters said an additional 1 to 2 inches of rain is expected over much of north Georgia. A flood watch covers north Georgia, including all of metro Atlanta, until 7 a.m. Thursday.
More than 600 flights into, out of or across the U.S. have been canceled and 319 have been delayed due to the large storm system that has moved on to the East Coast.
That's down significantly from Monday evening, when about 7,600 flights were affected.
Flight-tracking service FlightAware showed that of the 805 cancellations, about 200 were at Chicago O'Hare International Airport.
A typical day sees about 150 cancellations and 4,000 delays.