What is a Tornado?
* A rotating column of air
that is in contact with the
ground and cloud base.
Tornadoes form due to
warm moist air that is
blown in from the Gulf,
cold air from Canada, and
dry air from the Rockies
Nearly 1300 tornadoes hit
the US alone, on average,
in one single year.
Where is it?
Tornadoes are most commonly seen in the
United states, specifically in Tornado Alley,
but can be found in other countries as well.
The United States has 4 times the amount
of tornadoes than Europe.
The Unknown of a Tornado
Tornadoes are still being observed and are not quite
*Tornadoes could dissipate because
of the air stabilizing. This could be
caused by the cold outflow from other
*Every storm is different. While one
tornado includes hail, rain, and
lightening; another may have neither
“Tornadoes skip around?”
Not necessarily, as the definition clearly states, a tornado needs to have
contact with the ground and the cloud base in order to be defined as a
tornado. However, there are 3 reasons why this may seem possible:
The tornado is to weak to
Multiple tornadoes happened;
but there was no survey done
to precisely separate their
paths (very common before
the 1970s); or
There were multiple
tornadoes with only short
separation, but the survey
erroneously classified them
as one tornado.
A sub vortice is a multi vortex tornado, containing multiple tornadoes that are usually orbiting the
center of a larger tornado circulation.
The larger tornado could also
absorb the other tornadoes but this
is very unusual.
Deadliest Tornado: "Tri-state" tornado of 18 March 1925 killed 695
Biggest 24 Hr Outbreak: 175 tornadoes on 27-28 April 2011, with a
damage-rating breakdown of EF0: 59, EF1: 65, EF2: 20, EF3: 16,
EF4: 11, and EF5: 4
Biggest Tornado Recorded: 31 May 2013, a
deadly, multiple-vortex tornado near El Reno,
OK carved a maximum path width of 2.6 miles
Most Traveled Tornado: In 1917 traveled 570
kilometers (About 354 miles) across Illinois
and Indiana lasting well over 7 hours
Other Tornado-Like Features
Waterspout: A tornado over water
Landspout: Dust Tube Tornado
Gustnado: Gust Front Tornado
Fire Whirl: Small-scale, tornado-like circulations
can occur near any intense surface heat source
Dust Devil: Are
clouds and are very
The Problem with Tornadoes
*They are expensive because they cause a lot
*There is not enough time between the
warnings and an arrival of a tornado to warn
people to take shelter.
What Can Be Done?
*Cities can provide more underground shelter for the homeless and people
living in apartments, as well as safe rooms for housing.
*Technology can be used to continue to research tornadoes and find a way to predict them sooner.
*Building codes need to be changed for areas that are prone for tornadoes.
*People need to be aware, and not ignore, the types of tornado warnings:
*Tornado Watch is when a certain area is alerted that it may be possible a tornado
may happen but it is not for certain.
*Tornado Warning is when a tornado has been spotted
Mr. Thorne English 6 Class. (2003, March 21). Tornadoes. Retrieved from
http://www.bcps.org/offices/lis/models/studshow/pinegrovems/justinkmichaelg/tornadoes - jk and mg.htm
National Weather Service. (2013, August 30). The online tornado faq. Retrieved from
Pidwerny, M. (2008, May 28). Tornadoes. Retrieved from
United States Environmental Protection Agency (2013, May 21). Tornadoes. Retrieved from
Wikipedia. (n.d.). Tornado. In Retrieved from http://en.wikipedia.org/wiki/Tornadic