Severe thunderstorms rolled through southern Michigan during the late-night hours of Thursday, May 20th into the early morning hours of Friday, May 21st. The storms delivered strong winds, hail and heavy rain to southeast Michigan. Much of the rainfall fell in saturated areas that had experienced well-above average precipitation for the month of May. In Southeast Michigan, the combination of heavy rain and the power failure of the Wyandotte Pumping Station during the hours of 12 AM to 530 AM on May 21st led to the occurrences of basement flooding in Dearborn Heights, Romulus, and Allen Park.

Hail in WASHTENAW, MICHIGAN
From 20-MAY-04 23:49:00 to 20-MAY-04 23:49:00 (EST)
Location: YPSILANTI
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 20-MAY-04 23:53:00 to 20-MAY-04 23:53:00 (EST)
Location: SALINE
Magnitude: 62 MG
Reported by: TRAINED SPOTTER

A trained spotter measured a 75 mph thunderstorm wind gust. The spotter also reported branches down.

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 20-MAY-04 23:53:00 to 20-MAY-04 23:53:00 (EST)
Location: SALINE
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained spotter estimated a 60 mph thunderstorm wind gust.

Flash Flood in WAYNE, MICHIGAN
From 20-MAY-04 23:30:00 to 21-MAY-04 07:00:00 (EST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

Numerous reports of 6 to 12 inches of water on area roadways. A Local State of Emergency was declared in the City of Dearborn Heights. Numerous side streets were impassable and several homes experienced flood damage. The City of Romulus also reported homes with basement flooding.

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 20-MAY-04 23:40:00 to 20-MAY-04 23:40:00 (EST)
Location: YPSILANTI
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Law enforcement reported trees blown down.

Hail in WASHTENAW, MICHIGAN
From 20-MAY-04 23:40:00 to 20-MAY-04 23:40:00 (EST)
Location: YPSILANTI
Magnitude: 1.75 
Reported by: LAW ENFORCEMENT

Hail in WASHTENAW, MICHIGAN
From 20-MAY-04 23:29:00 to 20-MAY-04 23:29:00 (EST)
Location: ANN ARBOR
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Hail in WAYNE, MICHIGAN
From 20-MAY-04 23:30:00 to 20-MAY-04 23:30:00 (EST)
Location: ROMULUS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WAYNE, MICHIGAN
From 21-MAY-04 00:10:00 to 21-MAY-04 00:10:00 (EST)
Location: DEARBORN
Magnitude: 52 EG
Reported by: EMERGENCY MANAGER

A trained spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in WAYNE, MICHIGAN
From 20-MAY-04 23:10:00 to 20-MAY-04 23:10:00 (EST)
Location: DEARBORN
Magnitude: 52 EG
Reported by: EMERGENCY MANAGER

A trained spotter estimated a 60 mph thunderstorm wind gust.

Hail in WASHTENAW, MICHIGAN
From 20-MAY-04 23:44:00 to 20-MAY-04 23:44:00 (EST)
Location: ANN ARBOR
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in MONROE, MICHIGAN
From 21-MAY-04 00:01:00 to 21-MAY-04 00:01:00 (EST)
Location: MILAN
Magnitude: 1.00 
Reported by: EMERGENCY MANAGER

Hail in WASHTENAW, MICHIGAN
From 21-MAY-04 00:00:00 to 21-MAY-04 00:00:00 (EST)
Location: MILAN
Magnitude: 1.00 
Reported by: FIRE DEPT/RESCUE SQUAD

Thunderstorm Wind in LENAWEE, MICHIGAN
From 21-MAY-04 13:00:00 to 21-MAY-04 13:00:00 (EST)
Location: ADRIAN
Magnitude: 55 EG
Reported by: NEWSPAPER

Trees and wires were blown down. A large tree landed on a house. A tree also fell on a woman. She was treated for minor injuries at Bixby Medical Center.