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EF0: 65-85 mph. EF1: 86-110 mph ... EF4: 166-200 mph. EF5: Over 200 mph. EF5 tornadoes in Oklahoma. Since 1905, NWS has tracked 13 EF5 tornadoes ... 852 SW 11 in Moore, where seven children died ...
An EF5 rating on the new scale requires a higher standard of construction in houses than does an F5 rating on the old scale. So, the complete destruction and sweeping away of a typical American frame home, which would likely be rated F5 on the Fujita scale, would probably be rated EF4 or lower.
The Fujita scale was applied retroactively to tornadoes reported between 1950 and the adoption of the scale in the National Oceanic and Atmospheric Administration (NOAA) National Tornado Database. Fujita rated tornadoes from 1916 to 1992 [ 4 ] [ 5 ] and Tom Grazulis of The Tornado Project retroactively rated all known significant tornadoes (F2 ...
Despite their relative rarity, the damage caused by EF5 tornadoes represents a disproportionate hazard to life and limb; since 1950 in the United States, only 59 tornadoes (0.1% of all reports) have been designated F5 or EF5, and yet these have been responsible for more than 1300 deaths and 14,000 injuries (21.5 and 13.6%, respectively).
Tornadoes are measured on the enhanced Fujita scale, which begin with EF0, a tornado with winds between 65 and 85 miles per hour, and goes up to an EF5 with winds of more than 200 miles per hour.
Tornadoes are ranked from EF0 to EF5. The scale is divided into six categories: F0: Gale; 65 to 85 mph. F1: Weak; 86 to 110 mph. F2: Strong; 111 to 135 mph. F3: Severe; 136 to 165 mph.
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
What's the difference? There are six categories used by the National Weather Service to classify the rotational speed of tornadoes (EF0-EF5) but just two levels to warn of tornado activity.
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