Severe Summer Weather Site Of Amateur Radio

KA4JHD in Selma, Al.

( I am proud to tell you this picture was used on the
Weather Channel Online Photo Gallery. )

These hailstones fell on South Dallas County Alabama
from a supercell during a Tornado Warning on April 6, 2000.
No touchdown damage was reported !!

The Doppler image below was the supercell that created the hailstones
and the Tornado Warning issued by the NWS in Birmingham, Al.

During the summer months THE NATIONAL WEATHER SERVICE scans the sky with their antennas and watch their screens for developing THUNDERSTORMS that can produce sudden TORNADOES. Always stay close to a T.V. Station or Radio Station for information so when the

WIND starts to blow, you'll know what action to take.

The Fujita Scale:

It measures the miles per hour
of Tornado Winds, and,
the damage it causes.

Fujita Classification
Wind speed (mph)
Damage
F - 0
42 - 72
Light
F - 1
73 - 112
Moderate
F - 2
113 - 157
Considerable
F - 3
158 - 206
Severe
F - 4
207 - 260
Devastating
F - 5
261 - 318
Incredible

There is a F-6, which is 319 mph.-Mach 1, but, has never been scientificly proven to be possible.

Facts about different types of Tornadoes :

Tornado type
Fujita Ranking
% of Tornadoes
Lifetime
% of Tornado Deaths
Weak
F0-F1
69%
1 - 10+ Minutes
Less than 5%
Strong
F2-F3
29%
20+ Minutes
30%
Violent
F4-F5
2%
1+ Hours
70%

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