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Any lightning safety plan should incorporate the 30/30 Rule. The 30/30
Rule states that people should seek shelter if the
"Flash-To-Bang" delay (length of time in seconds between a
lightning flash and its subsequent thunder), is 30 seconds or less, and
that they remain under cover until 30 minutes after the final clap of
thunder.
A 30 second lead time is necessary prior to a storm's arrival because
of the possibility of distant strikes. A 30 minute wait after the last
thunder is heard is necessary because the trailing storm clouds still
carry a lingering charge. This charge can and does occasionally produce
lightning on the back edge of a storm, several minutes after the rain has
ended.
Studies have shown most people struck by lightning are struck not at
the height of a thunderstorm, but before and after the storm has peaked.
This shows many people are unaware of how far lightning can strike from
its parent thunderstorm. DO NOT wait for the rain to start before seeking
shelter, and do not leave shelter just because the rain has ended.
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If no buildings are available, then an enclosed
metal vehicle such as an automobile, van, or school bus makes a
decent alternative.
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Where
NOT to Go Not all types of buildings or vehicles are safe during
thunderstorms. Buildings which are NOT SAFE (even if they are
"grounded") have exposed openings. These include beach
shacks, metal sheds, picnic shelters/pavilions, carports, and
baseball dugouts. Porches are dangerous as well.
Convertible vehicles offer no safety from lightning,
even if the top is "up". Other vehicles which
are NOT SAFE during lightning storms are those which have open cabs,
such as golf carts, tractors, and construction equipment.
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What
To Do If you are inside a vehicle, roll the windows up, and avoid
contact with any conducting paths leading to the outside of the
vehicle (e.g. radios, CB's, ignition, etc.).
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- What
NOT to Do Lightning can travel great distances through power lines,
especially in rural areas. Do not use electrical appliances,
ESPECIALLY corded telephones unless it is an emergency (cordless and
cell phones are safe to use).
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