|
A tornado is defined as a violently rotating column of air
extending from a thunderstorm to the ground. The most violent tornadoes are
capable of tremendous destruction with wind speeds of 250 mph or more.
Damage paths can be in excess of one mile wide and 50 miles long.
Tornado
Myths:
MYTH:
Areas near rivers, lakes, and mountains are safe from tornadoes.
FACT: No place is safe from tornadoes. In the late 1980's, a tornado
swept through Yellowstone National Park leaving a path of destruction up and
down a 10,000 ft. mountain.
MYTH:
The low pressure with a tornado causes buildings to "explode" as the tornado
passes overhead.
FACT: Violent winds and debris slamming into buildings cause most
structural damage.
MYTH:
Windows should be opened
before a tornado approaches to equalize pressure and minimize damage.
FACT: Opening windows allows damaging winds to enter the structure.
Leave the windows alone; instead, immediately go to a safe place.
Tornadoes Occur
Anywhere!
Frequency of Tornadoes
Tornadoes
can occur at any time of the year.
In
the southern states, peak tornado occurrence is in March through May, while
peak months in the northern states are during the summer.
Note,
in some states, a secondary tornado maximum occurs in the fall.
Tornadoes
are most likely to occur between 3 and
9 p.m. but have been known to occur at all hours of the day or
night.
The
average tornado moves from southwest to northeast, but tornadoes have been
known to move in any direction. The average forward speed is 30 mph but may
vary from nearly stationary to 70 mph.
The
total number of tornadoes is probably higher than indicated in the western
states. Sparse population reduces the number reported.
STAY INFORMED ABOUT THE STORM...By
listening to NOAA Weather Radio, commercial radio, and television for the
latest tornado WATCHES and WARNINGS.When conditions are favorable for severe
weather to develop, a severe thunderstorm or tornado WATCH is issued.
NOAA
WEATHER RADIO IS THE BEST MEANS TO RECEIVE WARNINGS FROM THE NATIONAL
WEATHER SERVICE
TORNADO WATCH:
Tornadoes are possible in your area. Remain alert for approaching storms.
TORNADO WARNING: A tornado has been sighted or indicated by weather
radar. If a tornado warning is issued for your area and the sky becomes
threatening, move to your pre-designated place of safety.
SEVERE THUNDERSTORM WATCH: Severe thunderstorms are possible in your
area.
SEVERE THUNDERSTORM WARNING: Severe thunderstorms are occurring.
Environmental Clues -
Look out for:
-
Dark, often
greenish sky
-
Wall cloud
-
Large hail
-
Loud roar;
similar to a freight train
Caution:
Some tornadoes appear as a visible funnel extending only
partially to the ground. Look for signs of debris below the visible funnel.
Some tornadoes are clearly visible while others are obscured
by rain or nearby low-hanging clouds.
These dangers
often accompany thunderstorms:
-
Flash Floods:
Number ONE weather killer - 146 deaths annually
-
Lightning:
Kills 75-100 people each year
-
Damaging
Straight-line Winds: Can reach 140 mph
-
Large Hail:
Can reach the size of a grapefruit - causes several hundred million
dollars in damage annually to property and crops
Before
the Storm:
-
Develop a
plan for you and your family for
home, work, ,
school and when outdoors.
-
Have frequent
drills.
-
Know the
county/parish in which you live, and keep a highway map nearby to follow
storm movement from weather bulletins.
-
Have a
NOAA Weather Radio with a
warning alarm tone and battery back-up to receive warnings.
-
Listen to
radio and television for information.
-
If planning a
trip outdoors, listen to the latest forecasts and take necessary action if
threatening weather is possible.
If a
Warning is issued or if threatening weather approaches:
-
In a home
or building, move to a pre-designated shelter, such as a basement.
-
If an
underground shelter is not available, move to an interior room or
hallway on the lowest floor and get under a sturdy piece of furniture.
-
Stay away
from windows.
-
Get out
of automobiles.
-
Do not
try to outrun a tornado in your car; instead, leave it immediately.
-
Mobile
homes, even if tied down, offer little protection from tornadoes and
should be abandoned.
Occasionally,
tornadoes develop so rapidly that advance warning is not possible.
Remain alert for signs of an approaching tornado. Flying debris from
tornadoes causes most deaths and injuries. |
Gather information about
hazards.
Meet with your family to
create a plan.
Implement your plan.
A DISASTER SUPPLIES KIT SHOULD INCLUDE:
-
A 3-day
supply of water (one gallon per person per day) and food that won't
spoil
-
one change
of clothing and footwear per person
-
one blanket
or sleeping bag per person
-
a first-aid
kit, including prescription medicines
-
emergency
tools, including a battery-powered NOAA Weather Radio and a portable
radio, flashlight, and plenty of extra batteries
-
an extra
set of car keys and a credit card or cash
-
special
items for infant, elderly, or disabled family members.
Practice
and maintain your plan.
After the Tornado
First make sure that the tornado or tornadoes are truly gone. Stay tuned to
The Weather Channel or your local television or radio station to get the
latest emergency information.
How To Help Injured
Others
Help injured or trapped persons by administering First Aid
and immediately calling 911 if there are life threatening injuries.
Beware Of Hazards
Stay away from downed power lines, and be sure to report
them to your utility company.
Stay away from damaged buildings until inspectors have
given you the green light.
If
floods result from the severe
thunderstorms, watch for snakes and other animals forced into your home from
flood waters.
Evacuate if you smell fumes or gas and notify emergency
personnel.
To prevent accidental fires, use flashlights, not candles,
to see if power is on or off after a tornado. (More people die from
candle-related fires after a disaster strikes then from the disaster
itself.)
If your home has been spared, keep children and pets
inside.
If pets must be walked outside, keep them on a leash.
Repairing The Damage
Wear sturdy shoes and protective clothing as you begin
cleaning up.
Clean up dangerous spills immediately ? medicines,
bleaches, chemicals, gasoline, or other flammable liquids.
Assess Psychological
Effects
In addition to the obvious physical damage, tornadoes can sometimes cause
emotional trauma and distress. Crisis counseling can help.
Should you or your children need or desire crisis
counseling, contact your local chapter of the
American Red Cross for information
about resources in your area.
Finally, address your problems one at a time. Preparation
may help you save lives and avoid injury. The rest can be rebuilt.
Check Out Other
Information Resources
American Red Cross
Your city or municipal Emergency Management Agency (EMA)
Carefully
evaluate the situation before bringing in outdoor items.
Make sure you have a portable radio for information.
Seek shelter in the lowest level of your home (basement or
storm cellar). If there is no basement, go to an inner hallway, a smaller
inner room, or a closet. Keep away from all windows.
You can cushion yourself with a mattress, but do not use
one to cover yourself. Do cover your head and eyes with a blanket or jacket
to protect against flying debris and broken glass. Don't waste time moving
mattresses around.
Keep your pet on a leash or in a carrier.
Multiple tornadoes can emerge from the same storm.
Do not go out until officials say it is safe.
In A Mobile Home
Leave your mobile home immediately and take shelter
elsewhere.
Outside
Try to get inside and seek out a small protected space
with no windows.
Avoid large-span roof areas such as school gymnasiums,
arenas, or shopping malls.
If you cannot get inside, crouch for protection beside a
strong structure, or lie flat in a ditch or low-lying area and cover your
head and neck with your arms or a piece of clothing.
In A Car
Ideally, you should avoid driving when tornadoes or other kinds of dangerous
weather threaten, as a vehicle is a very unsafe place to be. If, however,
this is not possible, stay as calm as possible, and assess the situation.
Your best option might be to get out of the car and lie
flat in a ditch or other low-lying area that is of sufficient depth to
provide protection from the wind.
If you do so, beware of water runoff from heavy rain that
could pose a hazard, get as far away from the vehicle as possible, and
shield your head from flying debris.
Or, more optimally, if possible take shelter immediately
in a nearby building.
Do not leave a building to attempt to "escape" a tornado.
If you are already in a sturdy building, do not get in a
vehicle to try to outrun a tornado.
Check Out Other Information Resources
Your city or municipal Emergency Management Agency (EMA)
|