On Wed Jun-10-2015 13:18, mark lewis (1:3634/12.73) wrote to Holger Granholm:   
      
      
    ml> 09 Jun 15 09:24, you wrote to me:   
      
    HG> In a message dated 06-08-15, mark lewis said to Holger Granholm:   
      
    HG> 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...   
      
    HG> Since the speed of sound is 360 m/s, 4 seconds will show that the strike   
    HG> was about 1.44 km away   
      
    ml> ahhh... so maybe it should be a 5 second count then... i always got   
    ml> mixed up and settled on 4 seconds... it is only an estimate,   
    ml> anyway... one might count their "one one thousands" too fast or too   
    ml> slow...   
      
   When I was a child, we were taught to count the seconds between the strike and   
   the thunder.  I got pretty good at it, but it was easier for me to count   
   backwards than forwards.  That way I knew I was within a millisecond of the   
   actual strike.  It's when counting those seconds forward and you don't get to   
   2, I worry about.  We had one a few days ago that was very close, but didn't   
   even make my UPS yell "Uncle", but scared the bejesus out of my daughter's cat   
   and me.  I didn't get to count.  (-:   
      
      
   Regards,   
      
   Roger    
   --- timEd/386 1.10.y2k+   
    * Origin: NCS BBS - Houma, LoUiSiAna - (1:3828/7)