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FEMA P-320, Taking Shelter from the Storm: Building a Safe Room for Your Home or Small Business (2014) [3] and ICC/NSSA Standard for the Design and Construction of Storm Shelters [4] provide engineering and testing requirements to ensure that above ground shelters manufactured to the published specifications will withstand winds in excess of ...
Modern above ground storm shelter. The term "tornado preparedness" refers to safety precautions made before the arrival of and during a tornado.Historically, the steps taken have varied greatly, depending on location, or time remaining before a tornado was expected.
Pieter Groenemeijer, the director of the European Severe Storms Laboratory noted that "on the IF-scale, 250 mph measured below 60 m above ground level is IF4 on the IF-scale, 290 mph is IF5." [80] After further analysis, this report was revised to winds of 308–319 mph (496–513 km/h) at 36–38 yards (33–35 m) above the surface. [81]
"This can be achieved if the tornado is visible at a far distance and there is light traffic, by driving at right angles to the perceived path of the tornado and seeking shelter in a sturdy ...
An EF4 tornado with wind speeds ranging from 166 to 200 mph can cause devastating damage. Most to all walls on a well-built house will likely collapse, and high-rise buildings can sustain ...
A storm shelter, bomb shelter, reinforced basement, or other subterranean shelter can provide substantial safety against EF4 tornadoes. [24] EF5 (T10–T11) damage represents the upper limit of tornado power, and destruction is almost always total.
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