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LIGHT.TXT
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1994-01-04
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LIGHTNING & MORE
Thunderstorms are well known for creating many types of weather
conditions. They quickly cause rain, damaging hail, sudden temperature
changes, strong winds, many types of lightning, and tornadoes. They
all have one thing in common : a moist, warm, unstable air mass.
Thunderstorms are created when a parcel of air warms, rises, and
continues to rise as long as it stays warmer that the surrounding air.
This rising column forms a thunderstorm 'cell' which has many updrafts
and creates the very existence of a full-fledged thundercloud, or more
correctly called a 'cumulonimbus' cloud. This cloud extends several miles
in the air -- up to about 10 miles. At that point it encounters the
tropopause (a layer of our atmosphere), which causes the cloud to flatten
out at the top and look anvil-shaped. Inside this large cloud, the
temperature is constantly changing, the movement is generally upward in
the center, then downward around the outsides. This creates large circular
air masses that are warm at the bottom, and cold at the top. That process
is what creates hail -- the constant warming and freezing cycle. The
larger and more unstable the cloud, the more cycles the hail has made;
thus, the larger the hail.
Lightning, while exciting to watch, can be very dangerous to people,
buildings, and rangeland. If it hits a power line near the block you
live on, you, your house, and all electronic equipment will be in danger.
It causes houses to catch fire. It melts, shatters, and fuses electronic
equipment. Turning TV's, computers, and VCR's off is no protection. A
spike protector is of NO protection from a close lightning strike either.
If you want to protect your valuable equipment during a lightning storm,
the only way to do it is to simply unplug it from the wall.
-=-