A polar vortex descending across the Upper Great Lakes enveloped Upper Michigan in an Arctic air mass which persisted from the night of the 12th into the morning of the 15th.  Bitter cold wind chills readings of 25 to 40 below zero were common in the nighttime and morning hours during this cold snap.

Cold/Wind Chill in DICKINSON, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 35 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.  Iron Mountain Schools were closed on the 15th due to the bitter cold.

Cold/Wind Chill in SOUTHERN SCHOOLCRAFT, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.

Cold/Wind Chill in SOUTHERN HOUGHTON, MICHIGAN
From 12-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 12th into the morning of the 15th.

Cold/Wind Chill in MARQUETTE, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 35 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.  Schools were closed throughout the county on the 15th due to the bitter cold.

Cold/Wind Chill in LUCE, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.

Cold/Wind Chill in ONTONAGON, MICHIGAN
From 12-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 35 below zero were common during the nighttime and morning hours from the night of the 12th into the morning of the 15th.

Cold/Wind Chill in BARAGA, MICHIGAN
From 12-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 12th into the morning of the 15th.

Extreme Cold/Wind Chill in GOGEBIC, MICHIGAN
From 12-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 35 to 45 below zero were common during the nighttime and morning hours from the night of the 12th into the morning of the 15th.

Extreme Cold/Wind Chill in IRON, MICHIGAN
From 12-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 35 to 45 below zero were common during the nighttime and morning hours from the night of the 12th into the morning of the 15th.

Cold/Wind Chill in KEWEENAW, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.

Cold/Wind Chill in NORTHERN HOUGHTON, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.

Cold/Wind Chill in DELTA, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.  Escanaba and Rapid River Schools were closed on the 15th due to the bitter cold.

Cold/Wind Chill in MENOMINEE, MICHIGAN
From 13-FEB-21 19:00:00 to 15-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of 25 to 30 below zero were common during the nighttime and morning hours from the night of the 13th into the morning of the 15th.  Schools were closed throughout much of the county on the 15th due to the bitter cold.