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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.
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 ...
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 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.
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 ...
F4 tornadoes were estimated to have had maximum winds between 207 mph (333 km/h) and 260 mph (420 km/h) and are considered violent tornadoes, along with F5 tornadoes. [ 3 ] [ nb 1 ] Following two particularly devastating tornadoes in 1997 and 1999, engineers questioned the reliability of the Fujita scale.
The Lone Grove tornado was the deadliest to hit Oklahoma since May 3, 1999 (until May 20, 2013), [16] and the strongest tornado during the month of February in Oklahoma since 1950. [17] The previous strongest were two F3 tornadoes which touched down on February 17, 1961.
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.