30-30 Rule on Lightning

This article on Mount Elbert showing ominous clouds coming has this:

There’s a 30-30 rule for lightning. Every five seconds between seeing a bolt and hearing thunder indicates about a mile between you and the lightning, Gratz said. So the first 30 in the rule indicates the minimum safe distance between you and the lightning — 30 seconds, or 6 miles…The second 30 in the rule is to wait 30 minutes after hearing the last rumble before venturing out again.

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One Response to 30-30 Rule on Lightning

  1. Larry says:

    Correct the quote: The seconds are counted between seeing a bolt of lightning and hearing thunder. You’ve got it backwards on the web page, even if it is a quote.

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