- Southern Great Lakes Derecho of 1991
The Southern Great Lakes Derecho of 1991 is the
derechoevent that occurred on July 7and 8, 1991. It lasted 17 hours and raced from South Dakotathrough southern Michiganbefore dying out over western Pennsylvania.
This derecho started in southeastern
South Dakotaat around 8 A.M. CDT.
The derecho moved into northern
Iowacausing more damage. Thousands of acres of corn and soybeancrops were flattened causing $60 million in damage (1991 dollars).The strongest wind gust -- 103 mph (170 km/h) -- was recorded at Sioux Center, Iowa. A school's roof was blown off in Orange City.
A gust of 71 mph was recorded at Mason City airport. There was also major damage inside the city. A woman was killed in McIntosh Woods State Park when a tree fell on her.
As this derecho moved into
Wisconsinin the early afternoon hours, it died out and a new derecho quickly developed. The derecho quickly gained in size and was once again causing damage. Thirty farm buildings were destroyed and over 250 were damaged over southern Wisconsin. In Waukesha, Wisconsin, a 300-year old Dunbar Oaktree was toppled. Dane, Jefferson, Waukesha, Washington, and Ozaukee counties were declared Federal Disaster Areas by FEMA.
The derecho entered southern
Michiganat around 6:30 P.M. EDT. It would move at up to 60 mph, and knock out power to nearly 853,000 customers. Up to this time this would be the largest number of customers in Michigan to lose power from the same storm system. For some customers it would take up to a week for the power to be restored.
An 84 mph (133 km/h) wind gust was reported at
Grand Rapids, Michiganand at Belding, Michigan. A semi-trailer was blown over on I-69near Marshall.
After crossing lower Michigan, the derecho moved into
Ontario. Many electrical lines were blown down and a number of roofs were damaged. A tornado touched down near Stratford and numerous funnel clouds were reported.
The bow echo system then crossed over
Lake Erieand dissipated over western Pennsylvaniaat around 2 A.M. EDT on July 8.
The Southern Great Lakes Derecho of 1991 traveled about 1000 miles (1600km) in 17 hours, caused $100 million in damage (1991 dollars), cut off electrical power to nearly 1 million customers, killed 1 and injured about 12 others.
List of derecho events
* [http://www.spc.noaa.gov/misc/AbtDerechos/casepages/jul7-81991page.htm The Southern Great Lakes Derecho of 1991] (
Storm Prediction Center)
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