Lightning

By definition, all thunderstorms contain lightning.  Lightning is a giant spark of electricity in our atmosphere.  Lightning occurs within a single cloud, cloud to cloud, and cloud to ground.  You can hear the thunder created by lightning without seeing the lightning. 

 

Lightning creates thunder rapidly, almost instantaneously, heating the air to nearly 50,000 degrees.  This creates an explosive expansion and slower contraction of air.  The resultant shock-wave is thunder.

 

Lightning travels roughly at half the speed of light, 93,000 miles per second.  Thunder travels much slower, about 1100 feet per second. Therefore, it takes thunder 5 seconds to travel one mile. Use the 5 to 1 ration to tell how far away you are from the strike.

 

The United States averages 25 million cloud to ground lightning strikes per year, taking an average of 58 lives.  Lightning injured more than 250 people in California and Nevada during the last 50 years.

Remember the 30/30 rule when dealing with lightning.  If after seeing lightning you hear thunder before 30 seconds passes seek shelter.  Also, stay in the shelter until 30 minutes elapses after the last lightning strike.

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