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. 2009 Apr;34(4):36-8, 40.
doi: 10.1016/S0197-2510(09)70100-7.

When lightning strikes: bolting down the facts & fiction

Ben Usatch  1
Affiliations

When lightning strikes: bolting down the facts & fiction

Ben Usatch. JEMS. 2009 Apr.

Abstract

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.

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