A warm front that was set up across the state on Saturday served as the focus for multiple storms that traveled east across the middle of Lower Michigan.  One storm was able to gather enough strength while moving into a more favorable environment to produce a swath of wind and hail damage across the middle of the NWS Detroit/Pontiac county warning area (CWA).  This storm packed high winds and lots of hail as it raced east at about 50-55 mph.  Straight line winds up to 70 mph from this storm caused numerous damage, including uprooted trees, downed power lines, and building damage.  Along with winds, numerous reports of hail also accompanied the storm with hail up to one inch reported in a few areas.  What was impressive with the hail, was the high amount of small hail that fell.  In some locations, hail completely covered the ground and was a couple of inches thick.

Thunderstorm Wind in GENESEE, MICHIGAN
From 12-APR-14 18:22:00 to 12-APR-14 18:22:00 (EST-5)
Location: LAKE FENTON
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous 18 inch diameter trees and power lines down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 12-APR-14 18:22:00 to 12-APR-14 18:22:00 (EST-5)
Location: RANKIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Downed power lines caused the closure of I-75.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 18:30:00 to 12-APR-14 18:30:00 (EST-5)
Location: NEWARK
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and power lines reported blown down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 18:44:00 to 12-APR-14 18:44:00 (EST-5)
Location: PERRY LAKE HGTS
Magnitude: 61.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous trees and power lines blown down, along with siding damage to a house.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:00:00 to 12-APR-14 19:00:00 (EST-5)
Location: WASHINGTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Power lines reported down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 19:06:00 to 12-APR-14 19:06:00 (EST-5)
Location: ROCHESTER HILLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One foot diameter pine trees uprooted.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 18:55:00 to 12-APR-14 18:55:00 (EST-5)
Location: LAKE ORION
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Widespread trees reported blown down.

Hail in MACOMB, MICHIGAN
From 12-APR-14 19:10:00 to 12-APR-14 19:10:00 (EST-5)
Location: MT VERNON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MACOMB, MICHIGAN
From 12-APR-14 19:15:00 to 12-APR-14 19:15:00 (EST-5)
Location: DAVIS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:23:00 to 12-APR-14 19:23:00 (EST-5)
Location: WALDENBURG
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Shingles blown off roofs and trees reported blown down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:10:00 to 12-APR-14 19:10:00 (EST-5)
Location: WASHINGTON
Magnitude: 54.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Seven large pine trees and power lines blown down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:13:00 to 12-APR-14 19:13:00 (EST-5)
Location: WASHINGTON
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power lines reported down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:25:00 to 12-APR-14 19:25:00 (EST-5)
Location: WALDENBURG
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Street light and power poles reported down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:25:00 to 12-APR-14 19:25:00 (EST-5)
Location: CHESTERFIELD
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power lines reported down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:26:00 to 12-APR-14 19:26:00 (EST-5)
Location: CHESTERFIELD
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power lines reported down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:29:00 to 12-APR-14 19:29:00 (EST-5)
Location: ANCHOR BAY GARDENS
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

A power pole was reported down.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 12-APR-14 19:42:00 to 12-APR-14 19:42:00 (EST-5)
Location: MARINE CITY
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and power lines blown down. Shed blown over and three roofs partially peeled.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 18:30:00 to 12-APR-14 18:30:00 (EST-5)
Location: NEWARK
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a 65 mph thunderstorm wind gust.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 18:39:00 to 12-APR-14 18:39:00 (EST-5)
Location: JOSSMAN ACRES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 12-APR-14 18:56:00 to 12-APR-14 18:56:00 (EST-5)
Location: RANDALL BEACH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:10:00 to 12-APR-14 19:10:00 (EST-5)
Location: MT VERNON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in MACOMB, MICHIGAN
From 12-APR-14 19:15:00 to 12-APR-14 19:15:00 (EST-5)
Location: DAVIS
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a 62 mph thunderstorm wind gust.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 12-APR-14 17:50:00 to 12-APR-14 17:50:00 (EST-5)
Location: PERRY
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dozens of 1 foot diameter pine trees uprooted.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 12-APR-14 18:07:00 to 12-APR-14 18:07:00 (EST-5)
Location: BYRON
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Roof peeled of gymnasium.

Hail in GENESEE, MICHIGAN
From 12-APR-14 18:18:00 to 12-APR-14 18:18:00 (EST-5)
Location: LINDEN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OAKLAND, MICHIGAN
From 12-APR-14 18:30:00 to 12-APR-14 18:30:00 (EST-5)
Location: NEWARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OAKLAND, MICHIGAN
From 12-APR-14 18:39:00 to 12-APR-14 18:39:00 (EST-5)
Location: JOSSMAN ACRES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OAKLAND, MICHIGAN
From 12-APR-14 18:42:00 to 12-APR-14 18:42:00 (EST-5)
Location: HOLLY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MACOMB, MICHIGAN
From 12-APR-14 19:14:00 to 12-APR-14 19:14:00 (EST-5)
Location: WASHINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 12-APR-14 18:05:00 to 12-APR-14 18:05:00 (EST-5)
Location: DURAND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

An 18 inch diameter pine tree was reported blown down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 12-APR-14 18:09:00 to 12-APR-14 18:09:00 (EST-5)
Location: GAINES ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Large tree was blown down, taking down a power line and blocking the road. A metal side barn was also heavily damaged.

Thunderstorm Wind in GENESEE, MICHIGAN
From 12-APR-14 18:10:00 to 12-APR-14 18:10:00 (EST-5)
Location: GAINES
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A roof was blown off a house.

Thunderstorm Wind in GENESEE, MICHIGAN
From 12-APR-14 18:18:00 to 12-APR-14 18:18:00 (EST-5)
Location: LINDEN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and power lines reported down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 12-APR-14 18:20:00 to 12-APR-14 18:20:00 (EST-5)
Location: RANKIN
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous uprooted trees and power lines down.