Whether you live in this group of states - often called "Tornado Alley" - or not, spring brings the increased possibility of a deadly tornado. Are you prepared?
Learn about the atmospheric events that signal the possibility of a tornado -- and what safety measures you can take to survive if a twister hits.
A tornado is a violent windstorm characterized by a twisting, funnel-shaped cloud. It is spawned by a thunderstorm (or sometimes as a result of a hurricane) and produced when cool air overrides a layer of warm air, forcing the warm air to rise rapidly. The damage from a tornado is a result of the high wind velocity and wind-blown debris. Tornado season is generally March through August, although tornadoes can occur at any time of year. They tend to occur in the afternoons and evenings: over 80 percent of all tornadoes strike between noon and midnight.
Each year, about 100,000 thunderstorms form over the United States. Between 600 and 1,000 of those thunderstorms will give birth to tornadoes.
Some may also remember the now famous quote from the film 'Twister', when a character asked a group of meteorologists following a series of tornadoes - "storm chasers" - how they would define the strongest twisters. After a moment of silence, one of them replies with a depth of feeling approaching awe that such an event is "the finger of God."
That's a high statement. But there's something about the greatest tornadoes that makes the highness hard to dismiss.
*Tornadoes can be nearly invisible, marked only by swirling debris at the base of the funnel. Some are composed almost entirely of windblown dust; others can be composed of several mini-funnels.
*Twisters can reach heights of 60,000 feet into the atmosphere.
*On average, during a tornado's 'path' - the total area certain to suffer at least some destruction by its deadly force - the twister will travel about 4 miles on the ground and cut a swath about 400 yards wide; but the worst ones can travel for 100 miles and be as large as a mile wide.
*The average tornado travels along the ground at a speed of 25 to 40 mph., but can go from one place to the next at speeds of up to 70 mph.>
*Twisters stay on the ground for an average of four to five minutes; however, a tornado can touch down several times.
*Most tornadoes move from southwest to northeast.
*Most twisters in the Northern Hemisphere rotate in a counter-clockwise direction. Most in the Southern Hemisphere rotate in a clockwise direction.
*Building damage during a tornado happens when high winds cause a buildup of pressure on building surfaces. This pressure is wind velocity squared.
*Most tornadoes occur between 3 pm and 7 pm
*Tornadoes occur throughout the world; however, the greatest number and most intense, deadly tornadoes occur in the United States.
*About 800 tornadoes touch down in the United States each year.
*Half of all tornadoes occur during the spring months of April, May, and June.
*Only 2 percent of tornadoes are considered violent, but those storms cause 70 percent of tornado-related deaths.
*In November 1988, a rash of 121 tornadoes struck 15 south central states, resulting in 14 lives lost and damages reaching $108 million.
*According to the National Weather Service, about 42 people are killed because of tornadoes each year.
Luckily, we are not mere sitting ducks, even against something as powerful and unpredictable as a twister. Every year, scientists and meteorologists are learning more about the formation and behavior of the mighty winds. This has resulted in quicker and more reliable emergency broadcasts accurately predicting where a tornado will appear and its probable path.
For instance, the quick reports of twisters possibly headed into the heart of Oklahoma City in May of '99 certainly saved many lives. Those reports were only possible because of what had been learned about twisters in the early and mid-90s.
Also, the fact that tornadoes usually strike between 3-7 pm gives us a fairly certain time frame in which to look out for them, and ensures us that most people will be awake and will probably hear reports immediately if a dangerous situation arises.
And in the US, if a situation begins as we're outside away from a radio or TV or when we're asleep, the National Oceanic and Atmospheric Administration (NOAA) weather alert radio receiver - equipped with the famous warning siren - can warn of an impending tornado if people are away from the usual immediate sources.
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According to Fujita and Pearson, the size of a tornado's funnel is not an indication of its intensity. The Fujita Scale is therefore based on damage, not the appearance of the funnel.
*F0 - Gale Tornado 40-72 mph Path length 0.3-0.9 miles; path width 6-17 yards
Path length 0.3-0.9 miles; path width 6-17 yards
Light damage; Some damage to chimneys; branches broken off trees; shallow-rooted trees pushed over; sign boards damaged.
F1 - Moderate Tornado (73 - 112 mph) Path length: 1.0-3.1 miles; path width: 18-55 yards
Path length: 1.0-3.1 miles; path width: 18-55 yards
Moderate damage; The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the road; attached garages may be destroyed.
F2 - Significant Tornado (113 - 157 mph) Path length: 3.2-9.9 miles; path width: 56-175 yards
Path length: 3.2-9.9 miles; path width: 56-175 yards
Considerable damage; entire roofs torn from frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light-object missiles generated.
F3 - Severe Tornado (158 - 206 mph) Path length: 10-31 miles; path width: 176-566 yards
Path length: 10-31 miles; path width: 176-566 yards
Severe damage; walls torn from well-constructed houses; trains overturned; most trees in forests uprooted; heavy cars lifted off ground and thrown.
F4 - Devastating Tornado (207 - 260 mph) Path length: 32-99 miles; path width: 0.3-0.9 miles
Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.
F5 - Incredible Tornado (261 - 318 mph) Path length: 100-315 miles; path width: 1.0-3.1 miles
Strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile-sized missiles fly through the air 100 yards or more; trees debarked; steel reinforced concrete structures badly damaged.
We are a survival site, and so the very best advice we can give is to let the storm chasing to those who are either sufficiently trained, or simply stupid enough, to follow one of these things. You're not actors on a movie set; there is no take two in real-life. Your only worry should be to protect yourself, those you care for, and your home as best you can. How do you do that?
Many may suppose that they need only worry about the funnel cloud as it sweeps over them; but without the right preparations beforehand or maintaining the correct behavior afterward, a person could still easily end up becoming one of those injured, if not worse. Avoid such problems by knowing what to do before it happens.
Determine the best location in both your home and where you work or go to school where you can take shelter when threatened by a tornado. A basement or cellar will usually afford the best protection. If an underground shelter is not available, identify an interior room or hallway on the lowest floor.
Conduct periodic tornado safety drills with your family.
Especially if you live in 'tornado alley', you should know the locations of designated shelters in places where you and your family spend time, such as public buildings, nursing homes and shopping centers. Ask whether your children's' schools have identified shelter space.
If a tornado is baring down, put on a helmet. Helmets with face protection (commonly worn on dirt bikes and street bikes) are the first choice to turn to. A secondary choice is a football helmet or baseball catcher's mask with face guard. Third choice would be a helmet worn by skiers / snowboarders, or even a baseball helmet.
Have emergency supplies on hand: Candles, flashlights, 3-5 days of food for each person in your family, 3-5 days of bottled water for each person in your family, propane cooking stove, extra propane, cold weather clothing, cold weather sleeping gear, rain gear, axe, lighters, wooden matches, gasoline stored in approved containers away from the home such as in or outside a shed on your property.
Be Able to Turn Off Utilities
Learn how to shut off the utilities to your home. Purchase a wrench specifically for shutting off natural gas.
Have Plans for Locating Family Members
Decide how and when your family will reunite, if separated. Carefully go over a map of the area and have a Plan A meeting place as well as a Plan B (should Plan A be flooded, destroyed, or have something else take place making it unsuitable or inaccessible to meet other family members).
Make an inventory of your possessions. Take photographs and / or videotape your belongings. Keep records in a safe deposit box or some other safe place away from the premises. You may want these to aid later insurance claims.
Emergency Weather Radio
Purchase a National Oceanic and Atmospheric Administration (NOAA) Weather Radio with battery backup and tone-alert feature which automatically alerts you when a Watch or Warning is issued. Or simply purchase a battery-powered commercial radio, and extra batteries. Make sure from time to time that you know where the radio is, that it still works, and that all the batteries are still good.
Know Your Area
Make sure you know the names of the towns and counties in which you live, work and haunt. They are used during both tornado warnings and watches to identify the area of potential tornadoes; therefore a solid knowledge here is essential. Keep a good, easy-to-read map in your car if you travel frequently, one that clearly details names of counties - which authorities use as the principal markers in spotting tornado activity - as well as towns.
During a tornado watch, observe the sky and listen to radio or television for more information. Be prepared to take shelter. If you see any revolving funnel-shaped clouds, report them immediately by telephone to your local law enforcement agency. If they appear to be headed your way, seek shelter in a well-constructed, sturdy building or structure as soon as possible.
For some reason mobile homes have a tradition of being destroyed by tornadoes. If you do live in a mobile home this is the time to temporarily move to a more substantial structure. Considering how dangerous tornadoes can be, if you live in tornado alley get yourself a home that is built with tornado survival in mind, such as a cellar you can take shelter in when the sirens sound or a tornado is on it's way. But if you find yourself living in a mobile home when a tornado strikes, it's recommended that you find yourself a nearby ditch or culvert as soon as possible and simply lie as flat as you can and wait (and pray) for it to pass you by.
If you're not a big fan of taking shelter in a ditch or culvert, don't wait till the last minute to make the move from a mobile home finally. Make sure you, and those you care for, are protected. Move now, if you can. Or start making preparations to move.
If you've heard there's a tornado warning in your area, call your local emergency management office or American Red Cross chapter about it if you care to know more. Also ask about community warning signals.
If there's one thing we can't stress enough, it's that you need to have your wits about you, and use all your senses in determining any danger.
If you know there's a tornado warning in your area and the skies around you look particularly dark, or there seems to have been a sudden drop in barometric pressure, seek shelter immediately. Take along at least one radio (any one will do but an NOAA radio would admittedly be best) and some water if you can.
Consider having a pre-packed backpack with clothes and emergency food, water and survival supplies for each member of your family.
If there's one constant with a twister, it's the sound that accompanies the tornado: it has most often been described as a deep rumble that builds into a roar.
Even if there hasn't been a tornado watch called in your area, if there is at least a tornado warning in your county or if the skies seem particularly ominous and the air possesses that drop in air pressure, and you begin to hear such a steady sound, seek shelter immediately. Unless you live next to a train station or airport runway (the sound of a twister has been compared to the long, low rumble of a speeding train more than anything else), take immediate precaution at anytime you hear noise that sounds like this or similar.
Don't bother to go outside and investigate; it may be too late for that. These things can hit fast -- dropping out of the sky and taking out whatever happens to be waiting on the earth below. Always be aware of that. Don't be complacent about a possible tornado once that warning has gone out.
The simplest advice? Be ready to take shelter if and when the need calls for it.
Go at once to your predetermined shelter (the basement, storm cellar, or the lowest level of the building). Stay there until the danger has passed.
If there isn't a basement, go to an inner hallway or a small inner room without windows, such as a bathroom or closet.
However much you want to see the storm, stay away from all windows, doors, and outside walls.
Go directly to the center of the room. Stay away from corners because they tend to attract debris. Get under a piece of sturdy furniture such as a workbench or heavy table and hold on to it for all you're worth.
Use sofa cushions or your arms to protect your head and neck.
If in a mobile home, get out and seek shelter elsewhere. A mobile home can overturn very easily even if precautions have been taken to tie down the unit. If there isn't a substantial shelter nearby, seek shelter in a low-lying area. Use your arms to protect your head and neck.
In a Public Building (School, Hospital, Factory, Shopping Center, etc.)
Go to the basement or to an inside hallway, a small, interior room, or a bathroom or closet on the lowest possible level.
Avoid places with wide-span roofs such as auditoriums, cafeterias, gymnasiums, and large hallways.
Stay away from windows and open spaces.
Get under a piece of sturdy furniture such as a workbench or heavy table or desk and hold on to it.
If shelter is not available or there is no time to get indoors, lie in a ditch, culvert, or low-lying area or crouch near a strong building. Use your arms to protect your head and neck. Be alert for potential flash flooding.
Pull to the side of the road avoiding trees, power lines and other objects that could fall or be hazardous.
Get out of the vehicle immediately and try to take shelter in a nearby building.
If there isn't time to get indoors, get out of the vehicle and lie in a ditch, culvert, or low-lying area away from the vehicle. Use your arms to protect your head and neck.
Check for injured victims. Render first aid if necessary.
Do not attempt to move severely injured victims unless absolutely necessary. Wait for emergency medical assistance to arrive.
Look out for broken glass and downed power lines.
Use the telephone only for emergency calls.
Try to get out of damaged buildings. Once out, do not reenter unless it's absolutely necessary. Use great caution at all times.
Take photos or videotape the damage to your home or property.
If driving, be alert for hazards in the roadway.
Check on neighbors/relatives who may require special assistance.
If unaffected by the tornado, stay out of the damaged area until allowed in by officials; your presence may hamper emergency operations.
However, if a clear need arises for help, be ready and willing -- but be smart -- about helping others in need. May God come to your aid -- he's always just a prayer away.
2. Tornadoes strike with incredible velocity. Wind speeds may approach 320 miles per hour. These winds can uproot trees and structures and turn harmless objects into deadly missiles, all in a matter of seconds. Mobile homes are particularly vulnerable to tornadoes.
3. Injury or deaths related to tornadoes most often occur when buildings collapse, people are hit by flying objects or are caught trying to escape the tornado in a car.
4. Tornadoes are most destructive when they touch ground. Normally a tornado will stay on the ground for no more than 20 minutes; however, one tornado can touch ground several times in different areas.
5. Tornadoes can occur practically anywhere, but are most prevalent in the US, and are most frequent in the Midwest, Southeast and Southwest. The states of Oklahoma, South Dakota, Missouri, Nebraska, Illinois, Indiana, Iowa, Kansas, Arkansas, Alabama, Florida, Georgia, Louisiana, Mississippi, and Texas are at greatest risk.
1. Publish a special section in your local newspaper with emergency information about tornadoes. Localize the information by printing the phone numbers of local emergency services offices, the American Red Cross, and hospitals.
2. Periodically inform your community of local public warning systems.
3. Sponsor a "Helping Your Neighbor" program at your local schools to encourage children to think of those persons who require special assistance such as elderly people, infants, or people with disabilities.
4. Conduct a series on how to protect yourself during a tornado in case you are at home, in a car, at the office, or outside.
5. Interview local officials about what people living in mobile home parks should do if a tornado warning is issued.
Many homes in the US 'Deep South' are for some reason built without a basement - a fact that is particularly strange since so many southern states are part of 'tornado alley'. In apparent response to this, a word from FEMA:
FEMA is urging people who live in tornado-prone areas to make sure they have a tornado-safe place to go during a tornado. In the absence of a basement, a tornado-safe room build within the house will protect your family during a tornado. Properly built safe rooms can provide protection against winds of 250 miles per hour and against flying objects traveling at 100 miles per hour. The plans for the safe rooms were developed along with the Wind Engineering Research Center of Texas Tech University in Lubbock, Texas.
References:Tornado Project Online