About 1,000 tornadoes occur each year in the United States, causing an average of $1.1 billion in property damage and 80 deaths. These storms vary in intensity and the accompanying damage can result in everything from minor repairs to complete destruction with little warning. Most tornadoes are relatively weak, and therefore, primarily damage roofs, windows and trees. While only two percent of tornadoes achieve the most violent and damaging classification, one quarter of tornadoes are powerful enough to cause 90 percent of the damage and two-thirds of the deaths.
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