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A Federal Signal Modulator siren in Bay Head, New Jersey.. Federal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis, or any other disaster.
Upon seeing an approaching storm or noticing any of the danger signs, they were advised to prepare to take shelter immediately, [2] such as moving to a safe room, internal stairway, or other safe-haven area. All individuals and families should have a disaster preparedness kit made prior to tornado.
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There are the generic underground storm/tornado cellar, also called storm or tornado shelters, as well as the new above-ground safe rooms. A "cellar" is an underground unit, but for the sake of the specified use of a "storm cellar" to protect one from high-wind storms, it seems relevant to mention saferooms.
Completed Tornado Diagram. Tornado diagrams, also called tornado plots, tornado charts or butterfly charts, are a special type of Bar chart, where the data categories are listed vertically instead of the standard horizontal presentation, and the categories are ordered so that the largest bar appears at the top of the chart, the second largest appears second from the top, and so on.
The tornado did take some items from the Calhouns that were difficult to replace, such as family photos. "We lost the pictures," Sue Cahoun said. "We didn't lose the memories."
A diagram of the Fujita scale as it relates to the Beaufort scale and the Mach number scale. For many years, before the advent of Doppler radar, scientists relied on educated guesses for tornado wind speed. The only evidence indicating wind speeds found in the tornado was the damage left behind by tornadoes that struck populated areas.
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