Winds shifting northwest in the wake of a surface trough brought heavy lake effect snowfall downwind of Lake Superior from the 1st continuing into the 4th. A sharp cold front moving through on the 2nd reinforced the Arctic airmass over the region and caused wind chills to plummet to 35 to 40 below zero across portions of Upper Michigan on the 3rd continuing into the morning of the 6th.
Many area schools were closed or delayed on the 5th with a few remaining closed or delayed on the 6th due to the frigid weather. The Iron Mountain Fire Department responded to calls of sprinkler systems bursting, while several residents in Ishpeming reported frozen pipes during the Arctic outbreak.

Winter Storm in NORTHERN HOUGHTON, MICHIGAN
From 01-FEB-07 07:00:00 to 03-FEB-07 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Observers reported 24-hour snowfall totals ending on the morning of the 2nd of 14.5 inches at Atlantic Mine and 11 inches at Calumet. Additional observer reports of 24-hour snowfall totals ending on the morning of the 3rd included 17 inches at Chassell, another 14 inches at Atlantic Mine and 11 inches at Painesdale. Gusty west to northwest winds also caused blowing and drifting of snow and reduced visibilities through the period.

Winter Storm in ALGER, MICHIGAN
From 02-FEB-07 00:00:00 to 04-FEB-07 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Fifteen inches of snowfall was measured at Grand Marais for the 24-hour period ending on the morning of the 3rd. Grand Marais received another 12 inches of snow for the 24-hour period ending on the morning of the 4th.  Gusty west to northwest winds caused blowing and drifting of snow and reduced visibilities through the period.

Winter Storm in ONTONAGON, MICHIGAN
From 01-FEB-07 12:00:00 to 02-FEB-07 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Ten to twelve inches of snowfall was measured in 24 hours four miles south of Ontonagon. Gusty northwest winds also caused some blowing of snow and reduced visibilities.

Extreme Cold/Wind Chill in KEWEENAW, MICHIGAN
From 03-FEB-07 17:00:00 to 04-FEB-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind chills lowered to near 35 below zero at the Copper Harbor ASOS.

Extreme Cold/Wind Chill in DICKINSON, MICHIGAN
From 04-FEB-07 06:00:00 to 04-FEB-07 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind chills lowered to near 35 below zero at the Iron Mountain ASOS.

Extreme Cold/Wind Chill in DELTA, MICHIGAN
From 04-FEB-07 03:00:00 to 04-FEB-07 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chill values lower to around 35 below zero at the Escanaba AWOS.

Extreme Cold/Wind Chill in MARQUETTE, MICHIGAN
From 04-FEB-07 04:00:00 to 04-FEB-07 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chills lowered to near 35 below zero at the K.I. Sawyer AWOS.

Extreme Cold/Wind Chill in SOUTHERN HOUGHTON, MICHIGAN
From 04-FEB-07 04:00:00 to 04-FEB-07 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills lowered to near 35 below zero.

Winter Storm in LUCE, MICHIGAN
From 02-FEB-07 07:00:00 to 04-FEB-07 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two Heart measured 12 inches of snowfall in the 24 hour-period ending on the morning of the 3rd. Two Heart received another 12 inches of snow in the 24-hour period ending on the morning of the 4th. Gusty west to northwest winds caused blowing and drifting of snow and reduced visibilities through the period.

Extreme Cold/Wind Chill in GOGEBIC, MICHIGAN
From 03-FEB-07 15:00:00 to 06-FEB-07 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chills at the Ironwood AWOS plunged to 35 to 40 below zero on the afternoon of the 3rd and remained in that range through the morning of the 5th. Wind chills briefly dipped down to 35 below zero again on the morning of the 6th.

Extreme Cold/Wind Chill in NORTHERN HOUGHTON, MICHIGAN
From 03-FEB-07 17:00:00 to 04-FEB-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind chills lowered to around 35 below zero at the Houghton County Airport ASOS.

Extreme Cold/Wind Chill in SOUTHERN SCHOOLCRAFT, MICHIGAN
From 04-FEB-07 02:00:00 to 04-FEB-07 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chills lowered to near 35 below zero at the Manistique AWOS.

Extreme Cold/Wind Chill in IRON, MICHIGAN
From 04-FEB-07 00:00:00 to 05-FEB-07 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chills remained near 35 below zero through much of the period.

Extreme Cold/Wind Chill in ONTONAGON, MICHIGAN
From 04-FEB-07 00:00:00 to 05-FEB-07 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills remained near 35 below zero through much of the period.

Extreme Cold/Wind Chill in BARAGA, MICHIGAN
From 04-FEB-07 04:00:00 to 04-FEB-07 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills lowered to near 35 below zero.