The National Weather Service in Duluth is collecting information on the July 1, 2011 extreme wind event. A line of severe thunderstorms that moved through Pine County, Minnesota, and northwest Wisconsin, produced widespread, non-tornadic wind damage. Such winds are also often referred to as "straight-line winds" or "downburst winds". The damage included some areas of very intense forest blowdown. The National Weather Service in Duluth conducted a storm damage assessment the following day in parts of Pine, Burnett, Washburn, and Douglas Counties. This assessment was aided by aerial flyovers of the damage by the Burnett County Sheriff's Department. Both the ground and air assessments concluded that the damage across the area was caused by widespread, non-tornadic, straight line wind gusts in excess of 60 mph, with smaller pockets of intense winds in excess of 100 mph.
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For more on this event, please visit the July 1, 2011 Extreme Wind Event page.