Rochester MN (KROC AM News) - The Wind Chill Warning that had been in effect for the Rochester area was allowed to expire Sunday afternoon and was replaced by a Wind Chill Advisory that will remain in effect through noon Monday. 

The National Weather Service recorded an unofficial low temperature of -18 at the Rochester Airport early this morning with a wind chill that was slightly colder than -40. The morning low appears to have been the coldest in this region, while areas of northern Minnesota saw the mercury fall to between -25 and -30.

The bitterly cold arctic air mass responsible for putting the state in the deep freeze is predicted to stick around through the beginning of the week, with some moderation of the temperature on Tuesday. The National Weather Service is forecasting the temperature will drop to almost -20 Monday morning and may not even reach zero on Monday.

The wind chill readings are expected to remain in the -30 to -40 degree range through Monday night.

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