About Lightning Strikes and Warning for Electrical Storms:
"Article extract from The Siemens Magazine December 1999. You can subscribe to BLIDS service for early warning of bad weather and electrical storms.
It can save life and destruction of valuable property by early warning.
Typical subscribers are construction sites, transporting hazardous freight, cable cars, wind power plants, swimming pools, leisure parks, golf courses, water sports,
live stock farmers, and gliding clubs.
A potential difference of several hundred million volts builds up between the positively and negatively charged clouds, or between the clouds and the earth.
In what can be compared to a massive short circuit, this voltage then discharges, causing surges of current of between 20,000 and 100,000 amps to race along
a lightning channel some 5 kilometers long but only a few centimeters wide. In the process, the air in this channel is heated 30,000 Celsius-six times hotter
than the surface of the sun. As a result, the air expands faster than the speed of sound, thereby generating a sonic boom. That's what the thunder is.
Some bolts of lightning generate power of up to 10 billion kilowatts, i.e. 7,000 to 8,000 times the output of a nuclear power plant. But such phenomenal
power is only attained for a few millionths of a second-the duration of maximum current flow. Consequently, the average bolt would at most suffice to run a couple
of 100 watt bulbs for a day or two.
All the same, the energy that goes up in smoke this way is mind-blowing. At any one time, there are some 2,000 storms raging somewhere around the world. That's
almost 25 million bolts of lightning a day. The busiest time for BLIDS is July, when it registers around 50 percent of the one million or so storms that rage above
Germany each year.....Experts estimate that several billion dollars a year in Germany alone damage occur in the areas of telecommunications, data processing and air traffic control systems...." Siemens BLIDS Homepage
-5C=23F; 0C=32F; 5C=41F; 10C=50F; 15C=59F; 20C=68F; 25C=77F; 30C=86F; 35C=95F; 40C=104F
Fahrenheit to Centigrade temperature conversion formulae: C/5=(F-32)/9