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The Independence Day Derecho of 1977 was a derecho, or long-lived windstorm associated with a fast-moving band of thunderstorms, that occurred in the northern Great Plains of the U.S. on July 4, 1977. It lasted around 15½ hours. The derecho formed in Minnesota around 10 a.m. CDT on July 4 and became more intense around noon in the central part of the state. The derecho produced winds of 80-100 mph (130–160 km/h) in northern Wisconsin felling thousands of trees in the northern part of the state.〔(【引用サイトリンク】title=The Independence Day Derecho of 1977 )〕 ==Wisconsin== As the storm raced through Burnett, Washburn, Sawyer, Price, and Oneida counties, it caused a band of damage 10–20 miles (15–30 km) wide. Nearly 850,000 acres (3,400 km²) of forest were badly damaged or destroyed. The derecho caused $24M in property damage. One person was killed and 35 were injured. Here is a summary of damage by county: * Sawyer County, Wisconsin - A wind gust of 75 mph (120 km/h) was measured at the Hayward airport. The downburst winds destroyed several homes and barns. Winds of 135 mph (220 km/h) were estimated at the Flambeau River State Forest. A woman was killed when a tree fell on her camper at Connors Lake. Nearby, an area of old-growth forest was almost completely destroyed. * Price County, Wisconsin - The storm continued to damage several homes and injured 20 people. The gust front reached Phillips around 2:55 p.m. CDT and the severe winds lasted for 25 minutes. An anemometer at the airport registered a 100 mph (160 km/h) wind gust. All the homes in the Phillips area were damaged. Thirty were damaged beyond repair. * Oneida County, Wisconsin - The derecho continued to damage homes and blow down large areas of forest. The gust front entered Rhinelander around 3:30 p.m. CDT. A wind speed of 115 mph (185 km/h) was recorded at the airport. Seven people were injured in this county. The severe winds continued through northeastern Wisconsin and across Lake Michigan. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Independence Day Derecho of 1977」の詳細全文を読む スポンサード リンク
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