A cold front moved slowly south across southeast Michigan on the morning and afternoon of the 18th.  Thunderstorms developed along and ahead of the front.  A number of these became severe, producing marginally severe hail.  The largest hail report was half-dollar sized in Clarkston.The storms produced a healthy amount of lightning.  A strike in Saline caused fire damage to a home there.  At Detroit Metro Airport, lightning struck the steel superstructure of a new terminal under construction.  Nine workers were injured when the bolt struck, and two required an overnight  hospital stay.At the tail end of the episode, a stray thunderstorm wind gust downed a large tree at Braeburn Golf Course in Salem.  The tree fell on a golfer, and he died of his injuries while being transported to the University of Michigan Hospital.The storms also produced quite a bit of rainfall.  The highest rainfall amount, 4 inches, was recorded in the city of Monroe.  Small creeks and streams, and urban areas, saw some flooding develop in the afternoon.  Flood waters lingered into the next morning, with some rutting of rural roads, and flooding of yards along the smaller creeks.  Minor river flooding also resulted over the next few days (see below).

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 18-MAY-00 15:45:00 to 18-MAY-00 15:45:00 (EST)
Location: SALEM
Magnitude: 50 E
Property damage: 2K
Reported by: EMERGENCY MANAGER

Flash Flood in LENAWEE, MICHIGAN
From 18-MAY-00 15:00:00 to 19-MAY-00 04:00:00 (EST)
Location: COUNTYWIDE
Property damage: 20K
Reported by: LAW ENFORCEMENT

Hail in OAKLAND, MICHIGAN
From 18-MAY-00 09:20:00 to 18-MAY-00 09:20:00 (EST)
Location: ROCHESTER HILLS
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Hail in MACOMB, MICHIGAN
From 18-MAY-00 09:25:00 to 18-MAY-00 09:25:00 (EST)
Location: WASHINGTON
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Hail in MACOMB, MICHIGAN
From 18-MAY-00 13:40:00 to 18-MAY-00 13:40:00 (EST)
Location: WASHINGTON
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Hail in MACOMB, MICHIGAN
From 18-MAY-00 13:45:00 to 18-MAY-00 13:45:00 (EST)
Location: NEW BALTIMORE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 18-MAY-00 12:53:00 to 18-MAY-00 13:55:00 (EST)
Location: LINDEN
Magnitude: 1.00 
Reported by: GENERAL PUBLIC

Hail in OAKLAND, MICHIGAN
From 18-MAY-00 13:05:00 to 18-MAY-00 13:05:00 (EST)
Location: HOLLY
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Flash Flood in MONROE, MICHIGAN
From 18-MAY-00 15:00:00 to 19-MAY-00 04:00:00 (EST)
Location: COUNTYWIDE
Property damage: 30K
Reported by: LAW ENFORCEMENT

Hail in OAKLAND, MICHIGAN
From 18-MAY-00 13:10:00 to 18-MAY-00 13:10:00 (EST)
Location: CLARKSTON
Magnitude: 1.25 
Reported by: BROADCAST MEDIA

Hail in LIVINGSTON, MICHIGAN
From 18-MAY-00 13:14:00 to 18-MAY-00 13:14:00 (EST)
Location: COHOCTAH
Magnitude: 1.00 
Reported by: BROADCAST MEDIA

Hail in LIVINGSTON, MICHIGAN
From 18-MAY-00 14:55:00 to 18-MAY-00 14:55:00 (EST)
Location: HARTLAND
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in OAKLAND, MICHIGAN
From 18-MAY-00 15:07:00 to 18-MAY-00 15:07:00 (EST)
Location: HIGHLAND
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Lightning in WASHTENAW, MICHIGAN
From 18-MAY-00 09:00:00 to 18-MAY-00 09:00:00 (EST)
Location: SALINE
Property damage: 40K
Reported by: NEWSPAPER

Lightning in WAYNE, MICHIGAN
From 18-MAY-00 10:00:00 to 18-MAY-00 10:00:00 (EST)
Location: DETROIT METRO ARPT
Reported by: EMERGENCY MANAGER