For Halloween trick-or-treaters in parts of the Midwest, snow will be on the menu along with sugary snacks.
Snow showers were forecast to extend from the Upper Midwest across the Great Lakes through Halloween, which is Tuesday, the National Weather Service said.
As of Monday night, about 64 million people from southeastern Arizona to parts of New York state were under frost warnings, according to the weather service. Atlanta was among the areas under a frost watch until 10 a.m. Tuesday, with temperatures as low as 28 degrees possible.
The Cleveland weather service had fun with the forecast, warning that “A terrible end to October is expected throughout the region” and that on Tuesday the rain will turn to snow.
“Waves of snow,” with about 1 inch of accumulation, are forecast in time for the morning commute to Chicago. For the Baltimore and Washington, DC areas, the next few nights it will be the coldest of this fall.
The cold snap will bring colder weather to much of the Northeast and mid-Atlantic, where temperatures soared into the 70s and 80s over the weekend. In Washington, DC and Raleigh, North Carolina, temperatures Monday through Tuesday are expected to drop a whopping 20 F in 24 hours.
Another fast-moving clipper system falling south from Canada toward the Great Lakes will bring pockets of snow showers and potential for lake-effect snow to the region Monday night. The National Weather Service said more snow showers are possible as the system moves into the Upper Midwest on Tuesday.
Hurricane season remains active as the National Hurricane Center continues to monitor two disturbances in the Caribbean and Atlantic for possible development over the next week. The first is located east of the Bahamas with little chance of developing, and the second will likely form a tropical depression heading toward Central America later this week.