- Heat Wave of 1995 Derecho Series
The Heat Wave of 1995 Derecho Series are a series of
derechos that occurred from July 11through July 15, 1995in the U.S. This weather event is among one of the least known about but still notable weather events that occurred during the 20th century.
A tremendously hot and humid air mass over the
Great Plainscontributed to the development of four powerful derechos. These particular derechos occurred during the Heat Wave of 1995. The derechos developed along the northern rim of the air mass on a stationary front.
* The first derecho (shown in green) started in
Montanaduring the evening of July 11and dissipated over northern Wisconsinduring the morning hours on July 12.
* The second, and the longest lived, of the derecho series (shown in orange) started in Montana on
July 12following the same path as the first and moved into northern Michiganon the morning of the 13th. It moved south and hit eastern Michigan and southwestern Ontariobefore dissipating over southern Ohioand extreme northern West Virginiaat around midnight on July 14.
* The third (shown in purple) began developing in southwestern central
South Dakotain the late evening hours of July 13. It moved northeast through Minnesotaon the 14th. For some residents of northern Minnesota, this is the third time in a row they have been hit by a derecho.
* The fourth derecho, another significant derecho of this series (shown in red), started over upper Michigan on the evening of
July 14and moved east through southern and eastern Ontarioand north and western New Yorkin the early morning hours on the 15th. The derecho moves into the waters of the Atlantic Oceanin the mid-afternoon hours that same day where it dissapates quickly.
=The "Right Turn Derecho" of
July 12and 13=
This derecho raced through six states in 24 hours:
Montana, North Dakota, Minnesota, Wisconsin, Michigan, and Ohioand one Canadian province, Ontario. This was termed a 'right turn' derecho because its initial eastward progression moved sharply to a south-southeast direction, having developed from a band of thunderstorms in Montana. The airport at Fargo, North Dakotarecorded a 91 mph wind gust. This was the second day of three that Minnesota suffered hits from derecho winds--five million trees were blown down and buildings were damaged or destroyed, and six campers were injured by falling trees in the early morning hours.
The derecho moved south and southeast during the afternoon hours and blew more trees down. Three people were killed and several injuries occurred in eastern Michigan. In Roscommon County, 100,000 trees and 100 miles of power lines were blown down. In
Detroit, Michigan, 400,000 people lost power. It was the biggest power loss for the city since the July 7, 1991derecho event. The power loss only added to what might have been a very uncomfortable situation. As previously mentioned, Detroit was in a massive heat wave. Luckily, the heat was mitigated by cooling from rain.
The derecho wreaked havoc in southwestern Ontario, hundreds of trees fell and damage was caused to buildings. When the derecho crossed
Lake Erie, the storm capsized many boats and one man was killed.
The derecho moved into
Ohioand felled thousands of more trees. Three more people were killed and several more were injured. The derecho finally dissipated near the Ohio Riverat midnight on July 14.
=The Ontario-Adirondacks Derecho of
July 14and 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. One F2 tornado was reported near Bridgenorth destroying 20 homes and a marina with winds estimated upward of 200 km/h (120 mp/h). A sustained gust of 136 km/h (84 mp/h) was recorded just north of Toronto at the Buttonville Airport, which was located on the southern fringe of the main derecho line.
Thousands of trees were blown down severing power lines, blocking roadways, and damaing 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 Yorkstate 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 727was 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, Massachusettswhen 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.
List of derecho events
* [http://www.spc.noaa.gov/misc/AbtDerechos/casepages/jul1995derechopage.htm July 1995 Derecho Series page (courtesy of NOAA)]
* [http://cstar.cestm.albany.edu:7773/research/derecho.html Adirondack Derecho of July 1995]
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