Around 3:30 pm on August 28, 1990 with no sirens to announce its approach, a devastating tornado ripped through Plainfield, forever changing our history. Rated as an F-5, it remains the most powerful tornado ever to hit the Chicago area. The tornado left a total of 29 people dead, 350 people injured, 1,000 people homeless and an estimated $160,000,000 in damage. Following the catastrophic event, a National Oceanic and Atmospheric Administration Disaster Survey Team concluded that there was a "lack of coordinated, comprehensive, or integrated county-wide procedures or structures for, or dealing with, possible severe weather occurrences within the counties struck by the tornado." As a result, through the combined efforts of the National Weather Service, the College of DuPage, the DuPage Office of Emergency Management and other emergency management offices in northeast Illinois, the Multi-County Severe Weather Warning System was created[1].

Wind 65 to 85 mph. Causes some damage to siding and shingles
EF-1. Moderate damage
Wind 86 to 110 mph. Considerable roof damage. Winds can uproot trees and overturn single-wide mobile homes. Flagpoles bend.
EF-2. Considerable damage
Wind 111 to 135 mph. Most single-wide mobile homes destroyed. Permanent homes can shift off foundation. Flagpoles collapse. Softwood trees debarked.
EF-3. Severe damage
Wind 136 to 165 mph. Hardwood trees debarked. All but small portions of houses destroyed.
EF-4. Devastating damage
Wind 166 to 200 mph. Complete destruction of well-built residences, large sections of school buildings.
EF-5. Incredible damage
Wind above 200 mph. Significant structural deformation of mid- and high-rise buildings.












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