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A storm shelter or storm cellar is a type of underground bunker designed to protect the occupants from severe weather, particularly tornadoes. They are most frequently seen in the Midwest ("Tornado Alley") and Southeastern ("Dixie Alley") United States where tornadoes are generally frequent and the low water table permits underground livings.
A tornado operates as a rotating, funnel-shaped cloud that extends downward from a thunderstorm, to the ground, with swirling winds which have reached 300 miles per hour (480 km/h). [2] The wind speed might be difficult to imagine: traveling the length of a U.S. football field within 1 second [ 3 ] (over 130 meters or 430 feet per second).
Other homes have steel doors to one or more bedrooms that can be bolted closed to provide time for security forces to arrive. For strong storms or tornadoes, a storm safe room must be built to withstand high winds and flying debris, even if the rest of the residence becomes severely damaged or destroyed. Specific concerns include: [2]
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Meteorologists at the NWS office in Little Rock moved to a tornado shelter on Friday when it became evident the tornado was approaching. The office in Memphis took over issuing warnings for the ...
Building openings such as garage doors and windows are often weak points susceptible to failure by wind pressure and blowing debris. Once failure occurs, wind pressure builds up inside the building resulting in the roof lifting off the building. Hurricane shutters can provide protection.
Following rigorous scientific wind testing, the Insurance Institute for Business & Home Safety is urging homeowners to close all interior doors, in addition to windows and exterior doors.
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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