A tornado is a tube of violently spinning air that touches the ground. Wind inside the tornado spins fast, but the actual 'circle' of wind around them is huge. This makes tornadoes very dangerous. Tornadoes are especially dangerous to people in cars or mobile homes and about 60 people are killed by tornadoes every year.
Tornadoes mostly happen during strong thunderstorms called super cell storms. They cause a lot of damage to anything in their path. Tornadoes are ranked on the Fujita scale, from F0 to F5. The F0 has the lowest wind speed, and the F5 has the highest one.
Tornadoes can happen in nearly any part of the world. In the United States, a tornado has happened in all states. The middle part of the United States is nicknamed 'Tornado Alley' for the number of tornadoes there. A tornado can have wind speeds of over 300 miles per hour (480 km/h). Most tornadoes have wind speeds less than 110 miles per hour (180 km/h), are about 250 feet (80 m) across and travel a few miles before disappearing. Other tornado-like phenomena that exist in nature include the gustnado, dust devil, fire whirls, and steam devil; downbursts are frequently confused with tornadoes, though their action is dissimilar.
Characteristics[change | change source]
Condensation funnel[change | change source]
A tornado does not necessarily need to be visible; however, the extremely low pressure caused by the high wind speeds and rapid rotation usually causes water vapor in the air to condense into a visible condensation funnel. The tornado is the vortex of wind, not the condensation cloud.
Tornado family[change | change source]
A single storm may produce multiple tornadoes and mesocyclones. Tornadoes produced from the same storm are referred to as a tornado family. Sometimes multiple tornadoes from distinct mesocyclones occur at the same time.
Tornado outbreak[change | change source]
Occasionally, several tornadoes are spawned from the same very large storm. If there is no break in their activity, this is considered a tornado outbreak, although there are various definitions. A period of several successive days with tornado outbreaks in the same general area (spawned by multiple weather systems) is a tornado outbreak sequence, occasionally called an extended tornado outbreak.
Severe tornado outbreaks[change | change source]
Sometimes, tornadoes happen in groups. 148 tornadoes struck on the same day in April 1974. Many towns in the midwestern United States and Canada were destroyed. More than 300 people died. They were hit by flying wrecks, buried under houses, and thrown by powerful winds. That day, students in Xenia, Ohio were practicing for a play on the auditorium stage. One girl looked out the window and saw the tornado. The students ran into the hall, covering their heads. A few seconds later, all the school buses flew right onto the stage.
A man in another town hid under the couch in his living room. He held onto one couch leg. The tornado struck his house, and winds blew around him. When the tornado left, he was outside. There was no house. The couch had disappeared, and he was only holding onto one couch leg.
Tornado watches/warnings/emergencies[change | change source]
A "tornado watch" is given when the weather conditions look like a tornado could form. A 'PDS (Particularly Dangerous Situation)' watch is given when a likely tornado outbreak is to start, many strong tornadoes will form in the area, or an ongoing tornado outbreak is in the works in the area. A "tornado warning" is given if somebody has actually seen a tornado or if a tornado 'signature' (usually the storm has a 'hook' or 'U' echo) has shown up on radar. Tornado emergencies are issued in Special Weather Statements or Tornado Warnings saying that a powerful tornado is about to hit an area with a lot of people in it (especially cities in Tornado Alley), a tornado has been spotted, and the tornado is expected to cause deaths.
Safety tips[change | change source]
To keep safe in a tornado, here are some tips you can follow:
- Go to the lowest floor of the building. Stay close to the center of the building and away from windows, for example a bathroom with no windows and get in to the bath tub.
- Find a piece of strong furniture or a mattress to go under or hide in a closet and wait until it is over.
- If you are in a school, do not go to the gymnasium or any other place that has a high ceiling. Squat near the wall, placing your hands on the back of your head.
- If you cannot find shelter, find the lowest, most protected ground and cover your head with your hands.
Related pages[change | change source]
References[change | change source]
- "Glossary of Meteorology, 2nd ed". American Meteorological Society. 2000. http://amsglossary.allenpress.com/glossary/browse?s=t&p=34. Retrieved 2006-11-17.
- Branick, Michael (2006). "A Comprehensive Glossary of Weather Terms for Storm Spotters". NOAA. http://www.srh.noaa.gov/oun/severewx/glossary4.php#t. Retrieved 2007-02-27.
- Dylan J. Livengood; Harold E. Brooks, and Joseph T. Schaefer (2004). "Tornado Outbreak Day Sequences: Historic Events and Climatology (1875–2003)" (PDF). http://ams.confex.com/ams/pdfpapers/81933.pdf. Retrieved 2007-03-20.
- Herman, Gail (15 May 2010). Storm Chasers. New York: Penguin Group. ISBN 0-448-43337-0.
- Oard, Michael (1997). The Weather Book. P.O. Box 126, Green Forest, AR 72638: Master Books. ISBN 0-89051-211-6.
Other websites[change | change source]
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