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American Society of Civil Engineers ASTM D7158 is the standard most United States residential building codes use as their wind resistance standard for most discontinuous, steep-slope roof coverings (including asphalt shingles) with the following class ratings: Class D – Passed at basic wind speeds up to and including 90 mph (140 km/h); Class ...
The old scale lists an F5 tornado as wind speeds of 261–318 mph (420–512 km/h), while the new scale lists an EF5 as a tornado with winds above 200 mph (322 km/h), found to be sufficient to cause the damage previously ascribed to the F5 range of wind speeds.
Though the portable radar had the uncertainty of ±5–10 metres per second (11–22 mph; 18–36 km/h), this reading was probably within the F5 range, confirming that tornadoes were capable of violent winds found nowhere else on earth.
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80 mph (130 km/h) 0: Major derecho event. [117] The Lynchburg, Virginia area was hit the hardest. The city had a wind gust to 80 mph, with significant damage reported. Power was cut to 95% of the city. [118] Thirteen tornadoes were confirmed; six were rated F1. [119] Only the 1900 UTC outlook had a high risk. June 7: 1993: Upper Midwest [120] 40
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