The approach of an upper disturbance from Minnesota heralded one of the most significant severe weather events of the season on the 30th.  Widespread damage was reported from Ontonagon and Baraga counties east through Marquette and Delta counties.

Thunderstorm Wind in ONTONAGON, MICHIGAN
From 30-JUL-11 13:25:00 to 30-JUL-11 13:28:00 (EST-5)
Location: BERGLAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Branches estimated to be six inches in diameter were reported down.  Pea-sized hail was also observed.

Thunderstorm Wind in ONTONAGON, MICHIGAN
From 30-JUL-11 14:00:00 to 30-JUL-11 14:04:00 (EST-5)
Location: EWEN
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Trees reported down...dimensions unknown.  Time was estimated by radar.  Pea-sized hail was also reported.

Thunderstorm Wind in ONTONAGON, MICHIGAN
From 30-JUL-11 14:00:00 to 30-JUL-11 14:04:00 (EST-5)
Location: PAULDING
Magnitude: 55.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Trees reported down across town...dimension of trees unknown.

Thunderstorm Wind in BARAGA, MICHIGAN
From 30-JUL-11 14:30:00 to 30-JUL-11 14:34:00 (EST-5)
Location: WATTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Six-inch diameter tree limb reported down.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 30-JUL-11 14:37:00 to 30-JUL-11 14:40:00 (CST-6)
Location: ANTOINE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind gust measured by the Iron Mountain ASOS.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 30-JUL-11 14:45:00 to 30-JUL-11 14:48:00 (CST-6)
Location: IRON MTN
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Seven-inch diameter tree reported down.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:05:00 to 30-JUL-11 15:09:00 (CST-6)
Location: STEPHENSON
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines and trees reported down in Lake Township.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 30-JUL-11 16:10:00 to 30-JUL-11 16:13:00 (EST-5)
Location: AUSTIN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous 3 to 4 inch diameter tree branches down.  Time was estimated from radar.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:15:00 to 30-JUL-11 15:19:00 (CST-6)
Location: WALLACE
Magnitude: 57.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Various trees reported down on power lines.  Time is estimated from radar.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:15:00 to 30-JUL-11 15:19:00 (CST-6)
Location: BANAT
Magnitude: 58.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Approximately one-foot diameter trees reported down...along with multiple reports of power lines down.  Various 6-8 inch diameter branches were also reported down.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 30-JUL-11 16:15:00 to 30-JUL-11 16:18:00 (EST-5)
Location: LITTLE LAKE
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree fell onto a power line.  Time is estimated from radar.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:15:00 to 30-JUL-11 15:19:00 (CST-6)
Location: POWERS
Magnitude: 57.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Menominee County Sheriff's Office reported numerous trees and power lines down across the northern portion of Menominee County.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:15:00 to 30-JUL-11 15:19:00 (CST-6)
Location: MENOMINEE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Five to six-inch diameter tree limbs were reported down in Menominee.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:15:00 to 30-JUL-11 15:19:00 (CST-6)
Location: CARNEY
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three to four-inch diameter branches were reported down.  A tree also fell on power lines, and a metal lawn chair was blown across the yard.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:16:00 to 30-JUL-11 15:20:00 (CST-6)
Location: CARNEY
Magnitude: 58.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees reported down across roads and over power lines.  County Road 38 was closed.

Thunderstorm Wind in DELTA, MICHIGAN
From 30-JUL-11 16:35:00 to 30-JUL-11 16:39:00 (EST-5)
Location: (ESC)DLTA CO ARPT ES
Magnitude: 57.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees reported down over road near M-35 in Ford Township.

Thunderstorm Wind in DELTA, MICHIGAN
From 30-JUL-11 16:40:00 to 30-JUL-11 16:43:00 (EST-5)
Location: RAPID RIVER
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree reported down over a road just east of Rapid River.

Thunderstorm Wind in DELTA, MICHIGAN
From 30-JUL-11 17:08:00 to 30-JUL-11 17:11:00 (EST-5)
Location: MOSS LAKE
Magnitude: 55.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees reported down across Forest Highway 13.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 30-JUL-11 14:37:00 to 30-JUL-11 14:41:00 (CST-6)
Location: (IMT)IRON MTN ARPT
Magnitude: 57.00 MG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Newspaper

A 40-foot by 70-foot section of the Fontana Terminal Building at the Ford Airport in Iron Mountain was torn off by winds exceeding 60 mph.  Two flights were cancelled due to the damage and the passengers were bused to Escanaba to catch alternate flights.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 30-JUL-11 15:15:00 to 30-JUL-11 15:18:00 (CST-6)
Location: CARNEY
Magnitude: 63.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Three-foot diameter tree downed in yard on County Road G18.  Time was estimated from radar.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 30-JUL-11 14:43:00 to 30-JUL-11 14:46:00 (CST-6)
Location: ANTOINE
Magnitude: 57.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Large tree was toppled onto a car.

Thunderstorm Wind in ONTONAGON, MICHIGAN
From 30-JUL-11 13:55:00 to 30-JUL-11 13:59:00 (EST-5)
Location: BRUCE CROSSING
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Trees reported down.  Time was estimated from the radar.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 30-JUL-11 16:02:00 to 30-JUL-11 16:05:00 (EST-5)
Location: (SAW)KI SAWYER AFB G
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind gust measured by the Sawyer Airport AWOS.