On this date in 1976, a deadly tornado moved across parts of the southwestern Chicago, Illinois suburbs killing three people, and injuring 23 others. The tornado, with winds over 200-mph, moved from Lemont, to Downers Grove, causing $13 million dollars in damage when 87 homes were destroyed, and when another 90 were damaged. The tornado passed over the Argonne National Laboratory, peeling part of a roof of the building housing a nuclear reactor. The movement of the tornado was rather erratic as it moved southeast, then north, and finally turning northwest.