In a message dated 06-08-15, mark lewis said to Holger Granholm:   
      
   Hi Mark,   
      
   ml> here we use a 4 second rule...   
      
   ml> 1. see lightening flash   
   ml> 2. start counting - 1onethousand, 2onethousand, 3onethousand, etc   
   ml> 3. stop counting when the thunder is heard   
   ml> 4. divide the count by four and that's how many miles away the   
   ml> strike was   
      
   ml> dunno how favorably that compares with sound and 3 seconds per   
   ml> kilometer...   
      
   Since the speed of sound is 360 m/s, 4 seconds will show that the strike   
   was about 1.44 km away while 3 seconds means that the lightning struck   
   at slightly more than 1 km away.   
      
   One mile equals roughly to 1.6 km's.   
      
   ml> what's really wild is seeing lightening flashes and counting and   
   ml> counting and counting and never hearing the thunder because it is so   
   ml> far away ;)   
      
   Yes that happens when the lightning jumps between clouds in the sky.   
   The flash is seen from very far away.   
      
   Have a nice day,   
      
   Holger   
      
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