The coldest air of the winter, including temperatures that could get down to zero, are headed our way starting Sunday night, according to meteorologists.
The coldest stretch of weather will be Tuesday night - Thursday morning," writes WHDH-TV meteorlogist Chris Lambert in his blog. 'Expect near zero degrees readings in the morning, and teens for highs Wednesday afternoon."
The National Weather Service said that there is a "moderate probability" that a wind chill advisory may be issued on Tuesday night and Wednesday night. A wind chill advisory means that wind chill temperatures would be expected to be -25 degrees or less for at least three hours. That would mean that exposure to the combination of winds and low temperatures without protective clothing could cause frostbite or hypothermia.
There's also chance for a small amount of accumulating snow on Monday night into Tuesday morning, Lambert said, and he is keeping his eye on the possibility for a larger storm on Friday.
"This transition to colder weather marks the end of the warm weather as tomorrow is the only day left," Lambert wrote on Saturday evening.
Chief meteorologist Pete Bouchard called it a long duration deep freeze in his latest blog entry.
The National Weather Service predicts a low temperature of 0 degrees on Tuesday night, and -1 degrees on Wednesday night in Westford.