Updated Tornado Information from 11/22/2010

Tornado Path

…Updated information regarding the 22 November 2010 tornado in Winnebago, Boone, and McHenry Counties…

On Tuesday a team from the National Weather Service office in Romeoville performed an onsite survey of the damage resulting from Monday’s tornado.  Preliminary results of the survey were released Tuesday afternoon.  Based on additional information reviewed after the survey…including photos, videos, and reports from eye witnesses…plus a more detailed mapping of the tornado’s path, two adjustments will be made to the preliminary tornado track reported on Tuesday.

  The first adjustment will be to the starting point and time of the tornado’s track.  The preliminary track did not account for damage along Paulson Road east of I-39 in Loves Park.  That road was closed and blocked off, so the survey team was not actually able to view this damage from the ground.  The preliminary track also did not account for an eyewitness report of a tornado touchdown in the backyard of a home just west of I-39, on the eastern edge of a subdivision where thunderstorm wind damage had been identified.  Based on this information, together with multiple videos of the tornado, the newly estimated starting point of the tornado track is near latitude 42.33 N and longitude 88.97 W near Harvey Road.  The newly estimated start time of the tornado touchdown is 3:00 PM CST.

The second adjustment to the preliminary report released Monday is the addition of a new and separate tornado that touched down around 3:30 PM CST in the extreme northern part of McHenry County.  This EF0 tornado with winds estimated at 70 mph was approximately 50 yards wide and 200 yards long.  The location of this tornado, based on information received from county officials, was between 42.4932N, 88.5704W and 42.4949N, 88.5697 W.  The path of this tornado continued into Wisconsin and is being documented by the NWS office in Milwaukee and can be viewed here.

 All of this information should be considered preliminary.  Additional updates will be provided if and when new reports and data become available.  The final summary of this event will be issued in the monthly StormData publication.


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