A cold front moving through a warm and unstable airmass triggered a line of severe thunderstorms which affected portions of the Keweenaw Peninsula on the evening of the 1st.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: CHASSELL
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The 911 call center reported trees and power lines downed.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: LAURIUM
Magnitude: 65.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Home on Mine Street sustained damage.  Windows were partially broken and garage door was bowing inward.  Rollers were blown off the garage door. Garage was shifted one inch off of foundation.  Garage door and damaged windows were on the windward side of house facing the southwest.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: LAURIUM
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A damage path stretched from Mine Street through the intersection of US-41 and Church Street in North Calumet. The damage path was oriented from southwest to northeast and estimated to be one-quarter mile wide.  Metal building housing a travel trailer destroyed.  Several trees estimated to be between 18 to 24 inches in diameter were uprooted.  A drill shop roof near the elementary school sustained significant damage.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: LAURIUM
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A small wooden shed rolled once over a fence at Calumet Elementary School.  The shed was about 8 feet high and 12 feet wide.  Some playground equipment at the school was also tipped over.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: LAURIUM
Magnitude: 65.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Multiple locations along Caledonia Street had tree damage.  One house had a tree branch 1.5 feet in diameter fall onto a deck.  Other locations had 6 to 12-inch diameter branches down.  All of the branches were broken off in a north to northeast direction.

Thunderstorm Wind in KEWEENAW, MICHIGAN
From 01-JUL-11 22:47:00 to 01-JUL-11 22:52:00 (EST-5)
Location: (P59)COPPER HARBOR
Magnitude: 65.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Keweenaw County Sheriff reported a 150-yard stretch of approximately 40 trees uprooted or snapped just west of Copper Harbor.  The trees ranged from 6 to 18 inches in diameter and fell in the same general direction.  Several of the trees fell across Highway M-26 closing the highway.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: OSCEOLA
Magnitude: 65.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The Calumet Golf Club sustained tree damage.  Several oak trees approximately one-foot in diameter were snapped.  Several pine tree branches six inches in diameter were broken off.  A one-foot diameter pine tree was also uprooted.  Trees all fell to the northeast.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: CALUMET
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The 911 call center reported trees and power lines downed.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 01-JUL-11 22:30:00 to 01-JUL-11 22:34:00 (EST-5)
Location: CALUMET
Magnitude: 65.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Approximately 2-foot diameter pine tree was uprooted in the backyard of a house on Rockland Street.  The tree was lying in a north-northeast direction.  Time of the report was estimated from radar.