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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.
A unique feature of the International Fujita scale compared to the Fujita or Enhanced Fujita scale is a new damage indicator based on measured wind speeds. For the IF scale, only wind speeds measured at or below 10 metres (11 yd) can be used to determine a rating.
The new scale more accurately matches wind speeds to the severity of damage caused by the tornado. [8] Though each damage level is associated with a wind speed, the Fujita scale is effectively a damage scale, and the wind speeds associated with the damage listed are not rigorously verified.
John Mitchell and his family heard the tornado at 5:03 am. They retreated to the basement for safety. After 15 minutes, they emerged, and Mitchell went out in the truck to survey the damage.
The state increased performance criteria for wind-load provisions and adopted new wind provisions from the American Society of Civil Engineers. One important addition to the new code was the requirement of missile-impact resisting glass , which can withstand high-velocity impact from wind-borne debris during a hurricane.
The index, which is unofficially used by FEMA to determine the damage in an area, uses three colors to determine the severity of the aftermath based on Waffle House’s behaviors, according to FEMA.
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