A mostly sunny and mild day is expected Thursday with temperatures peaking near the 50s, warm weather that will replaced by a blast of polar air that might set new records for cold conditions.
The National Weather Service said a warm-up will arrive Thursday morning, eliminating the frosty air that greeted early morning commuters. Skies will clear out during the morning, before cloudy conditions arrive Thursday afternoon and some spotty showers are possible after nightfall.
“Temps recovering into the 40s this afternoon and near 50 along the South Coast,’’ forecasters wrote.
Overnight, temperatures will plummet until they are some 20 degrees below normal Friday — Veterans Day — and possibly Saturday, the weather service said. Actual temperatures will only reach the 20s and 30s during those two days, and the wind chill will be much lower, forecasters wrote.
“Blustery and unseasonably cold weather follows Friday into Saturday,’’ forecasters wrote.
Greater Boston will drop into the 30s Friday accompanied by winds gusting up to 40 miles an hour, forecasters wrote. The cold really arrives Friday night, when temperatures are expected to drop into the teens.
By Sunday, the cold wave will move on, and temperatures will recover into the 40s, forecasters wrote.John R. Ellement can be reached at firstname.lastname@example.org. Follow him on Twitter @JREbosglobe.