When lightning strikes: bolting down the facts & fiction.
MYTH: There's no danger from lightning until the rain starts. FACT: Lightning often precedes the storm by up to 10 miles. A reasonable guideline is the "30-30 rule," by which you count the seconds between the flash and the thunder. If the time span is less than 30 seconds, seek shelter. Additionally, wait a full 30 minutes from last lightning flash to resume outdoor activities.
Lankenau Hospital, Wynnewood, Pa., USA. docrags@drexel.edu
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D004632:Emergency Medical Services / Q000379:methods*; D006801:Humans; D015168:Lightning Injuries / Q000503:physiopathology* / Q000628:therapy