The thaw is coming.

Today's deep freeze may be followed by a half-dozen days with highs in the 40s.

Starting tomorrow, the overnight lows might top today's high, expected to be in the low 20s.

The arctic air mass that had this morning's temperatures in the teens is on its way out.

"It will exit so fast that temperatures might actually rise tonight," according to a National Weather Service statement. "Temperatures are then expected to be closer to normal levels for the rest of the week into the weekend."

On average, highs for this part of February are in the low 40s.

Rain is the only precipitation in the current forecast; tomorrow afternoon, Wednesday morning and Sunday are projected as the most likely times.

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Contact staff writer Peter Mucha at 215-854-4342 or