Severe thunderstorms developed during the evening hours of the 11th and continued into into the early morning hours of the 12th, producing numerous reports of downed trees and power lines, large hail, a few reports of flash flooding, and even a couple of F0 tornadoes. The first severe weather report was received from East Holton (Muskegon county), where three quarters inch hail was reported by trained spotters at 7:29 p.m.  A severe thunderstorm produced one inch hail in Grand Haven (Ottawa county) at 7:40 p.m., and a very brief tornado touchdown occurred in Coopersville (Ottawa county) at 7:42 p.m. The tornado was classified as an F0, and it produced no damage. Numerous reports of severe weather were also received across Muskegon county: Three quarters inch hail was reported in east Holton at 7:29 p.m. One and three quarters inch hail was reported in Fruitport. A very brief tornado touchdown was reported by trained weather spotters in Cloverville at 7:40 p.m.  It was also classified as an F0 tornado, and did not produce any damage. Finally, the thunderstorms also produced very heavy rain, causing flash flooding 1 mile west of Twin Lake (Muskegon county), where Cedar Creek went out of it's banks. In Muskegon (Muskegon county), many low lying areas were covered in one to two feet of water, many homeowners reported flooded basements, and portions of several roads were reported as flooded by area law enforcement. Another round of severe thunderstorms developed late at night. Three quarters inch hail was observed at Twin Lake (Muskegon county) at 11:35 p.m. Severe thunderstorms produced extensive damage across Newaygo county: Roof damage included shingles that were blown  off of a home 5 miles north of White Cloud at 11:57 p.m. Law enforcement reported that numerous trees were blown down along M-37 between Newaygo and White Cloud. Minor roof damage to a house occurred 3 miles northeast of Fremont. In White Cloud, 8 trees were blown down, each of which was 2 feet in diameter. In Mecosta county, one inch and nickel sized hail was reported in Big Rapids at 12:30 a.m. At 12:40 a.m., the road commission in Mecosta county reported that numerous trees were blown down countywide. One inch hail was observed in Le Roy (Osceola county) at 12:30 a.m. Across Kent county, a tree was blown down 2 miles northwest of Rockford at 12:35 a.m., and several trees were reported down by area law enforcement at 12:40 a.m. The final report of severe weather was received from Marion, in Osceola county, where 0.88 inch diameter hail was reported at 12:50 a.m.

Hail in MECOSTA, MICHIGAN
From 11-APR-01 23:30:00 to 11-APR-01 23:40:00 (EST)
Location: BIG RAPIDS
Magnitude: 1.00 
Property damage: 50K
Crop damage: 10K
Reported by: NWS STORM SURVEY

Thunderstorm Wind in KENT, MICHIGAN
From 11-APR-01 23:35:00 to 11-APR-01 23:40:00 (EST)
Location: ROCKFORD
Magnitude: 53 E
Property damage: 40K
Reported by: NWS STORM SURVEY

Thunderstorm Wind in NEWAYGO, MICHIGAN
From 11-APR-01 22:57:00 to 11-APR-01 23:02:00 (EST)
Location: WHITE CLOUD
Magnitude: 62 E
Property damage: 100K
Reported by: LAW ENFORCEMENT

Hail in OSCEOLA, MICHIGAN
From 11-APR-01 23:30:00 to 11-APR-01 23:30:00 (EST)
Location: LE ROY
Magnitude: 1.00 
Property damage: 10K
Crop damage: 10K
Reported by: NWS STORM SURVEY

Hail in OSCEOLA, MICHIGAN
From 11-APR-01 23:50:00 to 11-APR-01 23:50:00 (EST)
Location: MARION
Magnitude: 0.88 
Property damage: 10K
Crop damage: 10K
Reported by: NWS STORM SURVEY

Thunderstorm Wind in NEWAYGO, MICHIGAN
From 11-APR-01 23:20:00 to 11-APR-01 23:20:00 (EST)
Location: NEWAYGO
Magnitude: 53 E
Property damage: 50K
Reported by: LAW ENFORCEMENT

Hail in MUSKEGON, MICHIGAN
From 11-APR-01 18:29:00 to 11-APR-01 18:29:00 (EST)
Location: HOLTON
Magnitude: 0.75 
Property damage: 10K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Hail in OTTAWA, MICHIGAN
From 11-APR-01 18:40:00 to 11-APR-01 18:40:00 (EST)
Location: GRAND HAVEN
Magnitude: 1.00 
Property damage: 20K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Tornado in OTTAWA, MICHIGAN
From 11-APR-01 18:42:00 to 11-APR-01 18:42:00 (EST)
Location: COOPERSVILLE
Tornado F-scale: F0
Property damage: 0K
Reported by: NWS STORM SURVEY

Trained spotters reported a very brief tornado touchdown. The tornado was classified as an F0, with winds of 40 to 72 m.p.h. The tornado did not produce any damage.

Hail in MUSKEGON, MICHIGAN
From 11-APR-01 18:33:00 to 11-APR-01 18:33:00 (EST)
Location: FRUITPORT
Magnitude: 1.75 
Property damage: 50K
Crop damage: 25K
Reported by: NWS STORM SURVEY

Tornado in MUSKEGON, MICHIGAN
From 11-APR-01 18:40:00 to 11-APR-01 18:40:00 (EST)
Location: CLOVERVILLE
Tornado F-scale: F0
Property damage: 0K
Reported by: TRAINED SPOTTER

Trained spotters reported a very brief tornado touchdown, that did not produce any damage. The tornado was classified as an F0, producing wind speeds in the 40 to 72 m.p.h. range.

Flash Flood in MUSKEGON, MICHIGAN
From 11-APR-01 18:35:00 to 12-APR-01 03:45:00 (EST)
Location: TWIN LAKE
Property damage: 10K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Hail in MUSKEGON, MICHIGAN
From 11-APR-01 22:35:00 to 11-APR-01 22:35:00 (EST)
Location: TWIN LAKE
Magnitude: 0.75 
Property damage: 10K
Crop damage: 10K
Reported by: NWS STORM SURVEY