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Andrew Pritchard documented the damaging bow echo that plowed through northern Illinois on June 18, 2010. He experienced hurricane force winds, gusting to 70+ mph near DeKalb, IL! The beginning features a time lapse of the leading edge of this mesoscale system, as it approached and eventually overtook his position!

bow, echo, Chicago, wind, storm, damage, debris, Illinois, Indiana, june, 18, 2010, DeKalb, time, lapse, MCS, derecho