The 30-30
Rule:
Use the 30-30 rule where visibility is
good and there is nothing obstructing your view of the thunderstorm.
When you see lightning, count the time
until you hear thunder. If that time is 30 seconds or less,
the thunderstorm is within 6 miles of you
and is dangerous. Seek shelter immediately.
The threat of lightning continues for much
longer period than most people realize. Wait at least 30 minutes
after the last clap of thunder before
leaving shelter. Don't be fooled by sunshine or blue sky!
High Plains Climate Center: United States Severe Weather Climatology
 |
Lightning Awareness Week, June 20-24, 2007. |
Applied Climate Sciences Group School of Natural Resources University of Nebraska-Lincoln |
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