EM Tornado Safety

TORNADOES
A tornado is a violent windstorm characterized by a twisting, funnel-shaped cloud. It is spawned by a thunderstorm and is 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 the year. They tend to occur in the afternoons and evenings: over 80 percent of all tornadoes hit between noon and midnight.

When a tornado is coming, you have only a short amount of time to make life-or-death decisions. Advance planning and quick response are the keys to surviving a tornado.

The best protection during a tornado is on the lowest level of a building, preferably a basement or storm cellar.

Tornadoes strike with incredible velocity. Wind speeds may approach 300 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.

Injuries or deaths related to tornadoes most often occur when buildings collapse, people are hit by flying objects, or are caught trying to out-drive the twister in a car.

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.

BEFORE

        Conduct tornado drills each tornado season. Designate an area in the home as a shelter, and practice having everyone in the family go there in response to a tornado threat.

        Discuss with family members the difference between a "Tornado Watch" and a "Tornado Warning". Learn the tornado signs.

TORNADO WATCHES AND WARNINGS

        A tornado watch is issued by the National Weather Service when weather conditions are such that tornadoes are likely to develop.

        This is the time to remind family members where the safest places within your home are located, keep alert for changing weather conditions, and listen to the radio or television for further developments.

        A tornado warning is issued when a tornado has been sighted or indicated by radar. At this point, the danger is very serious and everyone should go to a safe place, turn on a battery-operated radio or television, and wait for the "all- clear" from the authorities.

TORNADO DANGER SIGNS

        Large hail: Tornadoes are spawned from powerful thunderstorms and the most powerful thunderstorms produce large hail. Tornadoes frequently emerge from near the hail- producing portion of the storm.

        Calm before the storm: Before a tornado hits, the wind may die down and the air may become very still.

        Cloud of debris: An approaching cloud of debris can mark the location of a tornado even if a funnel is not visible.

        Funnel cloud: A visible rotating extension of the cloud base is a sign that a tornado may develop. A tornado is evident when one or more of the clouds turns greenish (a phenomenon caused by hail) and a dark funnel descends.

        Roaring noise: The high winds of a tornado can cause a roar that is often compared to the sound of a freight train.

        Calm behind the storm: Tornadoes generally occur near the trailing edge of a thunderstorm. It is not uncommon to see clear, sunlit skies behind a tornado.

Did you know?

        Tornadoes can occur in any state, but are more frequent in the Midwest, Southeast and Southwest. The States of Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Louisiana, Mississippi, Missouri, Nebraska, Oklahoma, South Dakota, and Texas are at greatest risk.

D U R I N G

IF AT HOME:
        Go, at once, to the basement, storm cellar, or lowest level of the building. If there is no basement, go to an inner hallway or a small inner room without windows, such as a bathroom or a closet.

        Get away from windows. Go 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. Use arms to protect head and neck.

IF AT WORK OR SCHOOL:
        Go to the basement or to an inside hallway at the lowest level. Avoid wide rooms such as auditoriums, cafeterias, or large hallways. Get under a piece of sturdy furniture, such as a workbench or heavy table or desk, and hold on to it. Use arms to protect head and neck.

IF OUTDOORS:
        Never try to out-drive a tornado in a car or truck. Tornadoes can change directions quickly and can lift up a car or truck and toss it through the air. Get out of the car immediately and take shelter in a nearby building. If there is no time to get indoors, get out of the car and lie in a ditch or low-lying area away from the vehicle.

MOBILE HOMES
        Mobile homes are particularly vulnerable. A mobile home can overturn very easily even if precautions have been taken to tie down the unit. When a tornado warning is issued, take shelter in a building with a strong foundation. If shelter is not available, lie in a ditch or low-lying area a safe distance away from the unit.

A F T E R

      Check for injured or trapped persons. Give first aid when appropriate. Don't try to move the seriously injured unless they are in immediate danger of further injury. Call for help.

        Turn on radio or television to get the latest emergency information.

        Use the telephone only for emergency calls. Clean up spilled medicines, bleaches, gasoline, or other flammable liquids immediately. Leave the building if you smell gas or chemical fumes. Stay out of damaged buildings. Return home only when authorities say it is safe.

"OPEN WINDOW" MYTH
Many people mistakenly believe they should open a window when a tornado is coming. They believe that since houses are airtight, the change in air pressure during a tornado could cause a home to explode. Actually, buildings are not airtight. They leak, equalizing air pressure naturally. Opening a window allows the strong winds to enter, cause damage, and increase the possibility of injury.

DID YOU KNOW...

Tornadoes can be nearly invisible, marked only by swirling debris at the base of the funnel. Some are composed almost entirely of windblown dust and still others are composed of several mini-funnels.

On average, the United States experiences 100,000 thunderstorms each year. Approximately 1,000 tornadoes develop from these storms.

Although tornadoes do occur throughout the world, the United States experiences the most intense and devastating tornadoes.

Tornadoes produce the most violent winds on earth. Tornado winds can approach speeds as high as 300 miles per hour, travel distances over 100 miles and reach heights over 60,000 feet above ground.

According to the National Weather service, about 50 people are killed because of tornadoes each year.

              Although tornadoes occur in many parts of the world, these destructive forces of nature are found most frequently in the United States east of the Rocky Mountains during the spring and summer months. In an average year, over 800 tornadoes are reported nationwide, resulting in 50 deaths and over 1,500 injuries. 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. Once a tornado in Broken Bow, Oklahoma, carried a motel sign 30 miles and dropped it in Arkansas.

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.

BEFORE

D U R I N G IF AT HOME: Go, at once, to the basement, storm cellar, or lowest level of the building. If there is no basement, go to an inner hallway or a small inner room without windows, such as a bathroom or a closet.

A F T E R

Frequency of Tornadoes

D U R I N G

IF AT HOME:
Go, at once, to the basement, storm cellar, or lowest level of the building. If there is no basement, go to an inner hallway or a small inner room without windows, such as a bathroom or a closet.