In just a few days, today’s high temperature in the low 40s will be a fond memory of a balmy past.

After another bout of snow on Tuesday, the polar vortex is making a return to the Harrisburg region, dropping temperatures down to the single digits with potentially-dangerous subzero wind chill values.

According to the National Weather Service at State College, today will be mostly cloudy with a high near 42. Some light snow showers can be expected.

Tonight, expect partly-cloudy skies and a low around 20.

Monday will be sunny with a high of 35 and a low of 27.

A 40 percent chance of snow starts around 1 a.m. Tuesday, increasing to an 80 percent chance before 10 a.m. After that, expect occasional rain and snow through the rest of the day with a high of 39 and a low around 13. Less than an inch of accumulation is expected.

The polar vortex – a system of deep cold air – will move in from the north on Wednesday and stick around through at least Friday, bringing a deep freeze to the region and wind chills as low as 20 below zero.

Wednesday will be mostly sunny with a with a high of 19 and a low of 1.

Thursday will be mostly sunny with a high of 13 and a low of 7.

Friday will be mostly cloudy with a high near 23 and a low around 11.

And Saturday should be sunny with a high near 28.

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