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"When Thunder Roars, Go Indoors" Lightning Safety Week, June 20-26, 2016 |
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!
Image Charles Allison, Oklahoma Lightning
also shown with other lightning photos at Lightning Safety NOAA Photos