Heat Wave of 1995 Derecho Series - The Ontario-Adirondacks Derecho of July 14 and 15

The Ontario-Adirondacks Derecho of July 14 and 15

The Ontario-Adirondacks Derecho got its start near the straits of Mackinac on Friday evening July 14, 1995. At the Mackinac Bridge connecting the Upper and Lower Peninsulas of Michigan, 100 mph winds were detected and sustained winds above 80 mph continued on the bridge for 10 additional minutes. After crossing the open waters of Lake Huron/Georgian Bay, the storm raced southeastward into central southern Ontario. Several brief tornadoes were reported. An F1 tornado struck the Balsam Lake Trailer Park near Kirkfield, flipping over vehicles, destroying several trailers and sending ten people to hospital with non life-threatening injuries. One trailer was thrown over 250 meters. Across the lake from the trailer park, straightline winds caused extensive damage in the cottage community of Long Point. Further east, near Peterborough, an F2 tornado hit Bridgenorth damaging or destroying 20 homes and a marina with winds estimated upward of 200 km/h (120 mp/h). To get an idea of the straight line wind damage over a wide area, a sustained wind gust of 136 km/h (84 mp/h) was recorded just north of Toronto at the Buttonville Airport, which was located on the far southern periphery of the main derecho.

Many thousands of trees were blown down across the province severing power lines, blocking roadways, and damaging homes. One person was killed, and dozens of people were injured. Eight people trapped in flipped houseboat in Pigeon Lake near Peterborough were rescued hours after the storm. Power was not restored to some affected areas for up to a week after the event. The derecho caused CAN$53 million in damage.

The storm entered New York state at around 4 A.M. The storm slammed into the Adirondacks felling 900,000 acres (3,600 km²) of forest. The value of the loss of timber was estimated at over $200 million (1995 dollars).

The derecho passed through the Syracuse airport with a 76 mph wind gust. A parked Boeing 727 was blown into another plane. A 77 mph wind gust was recorded at Albany. It moved into New England a little after sunrise producing 70-90 mph wind gusts in several towns in Massachusetts. Fifty people were left homeless after the derecho blew the roof of an apartment building in Holyoke, Massachusetts. Three people were injured in Deerfield, Massachusetts when a hot air balloon got caught into the winds of the derecho gust front and blew the balloon into a tree.

The Ontario-Adirondacks Derecho was the strongest of the Derecho events of the previous days and is among the costliest thunderstorms in US/Canadian history. It caused $500 million US dollars in damage. Altogether, the four derecho events caused nearly $1 billion in damage.