The newest research information about what causes thunder makes more sense then the old theories. Tests show a capacitor bank discharged into a measured water volume turns into steam instantly producing 1800 volume of steam, producing more power than some explosives. A 300 mega watt capacitor bank was discharged into 2 tablespoons of water. The water turns to 1800 volumes of steam in less than 1/1000 of a second producing 36000 volumes of steam. Water has the explosive power of dynamite it blasted a hole through 3/4" plywood large enough to drop a basket ball through the hole. The explosion was so powerful that 99% of the wood from the hole was turned to dust. Thunder is directly proportional to the power of the lightning strike, the length of the lightning strike, and the amount of rain water in the path of the lightning strike. Lightning strikes are about 220,000,000 miles per hour (about 1/3 the speed of light). Lightning initial temperature is about 20,000 K to about 30,000 K. Several gallons of rain water can be turned to steam instantly producing a powerful explosion = to several 100 lbs of explosives.