This document summarizes information about tornadoes, including: 1. Tornadoes are violently rotating columns of air that extend from thunderstorms to the ground. 2. There are four main types of tornadoes: waterspouts, gustnados, multi-vortex tornadoes, and landspouts. 3. Tornadoes most frequently occur in the United States and can cause extensive damage, such as the 1999 Salt Lake City tornado that caused over $170 million in damage.

1. SDDDS
SOCIAL SCIENCE PRESENTATION
TOPIC
TORNADO
CLASS
X–“A”

2. Violentlyrotatingcolumnof air(Vortex) extending froma
thunderstormto the ground

3. A tornado is
violently
TORNADO
rotating column
of air that is in
contact with
both the surface
of the earth and
the base of a
cumulus cloud

4. TYPESOF TORNADOS
1.WATERSPOUT
2.GUSTNADO
3.MULTI-VORTEX
TORNADO
4.LANDSPOUT

5. WATERSPOUT
waterspouts tornado are the ones forming over water
and exhibiting similar patterns to the tornadoes
forming on land.
This type is not very common even if the tornadoes
forming on land and later entering water are included.

6. Gustnado
The word gustnado is a combination of 'gust front
tornado'
A gustnado is a short-lived whirl of dust and debris
lasting from a few seconds to minutes. These
tornadoes does not possess a condensation funnel
do not always connect the surface to the base of the
closest cloud base

7. MULTI-VORTEX TORNADO
A tornado is termed as multiple-vortex when it has more than
one vortex rotating around the main vortex. Here, the other
vortices rotate around the axes; the vortices themselves
rotate in the peripheral region of the eye of the tornado.

8. LAND SPOUT
 A landspout is similar to waterspout, only
differencebeingthat it is formed on land.
 These types of tornadoes are typically weaker
than traditional tornadoes, but can still cause
destruction because they can create strong
winds

9. TORNADO FACTS
1. Tornadoes may appear nearly transparent until dust and debris are
picked up or a cloud forms within the funnel.
2. The average tornado moves from southwest to northeast, but
tornadoes have been known to move in any direction.
3. The average forward speed is 30 mph but may vary from nearly
stationary to 70 mph.
4. The strongest tornadoes have rotating winds of more than 250 mph.
5. Tornadoes can accompany tropical storms and hurricanes as they
move onto land.

10. MOSTLY TORNADO EFFECTED
AREAS

11. TORNADOES ARE FOUND MOST
FREQUENTLY IN THE US

12. On August 11, 1999, an
F2 tornado touched down
in the metropolitan
area of Salt Lake City.
The tornado lasted ten
minutes and killed one
person, injured more
than 80 people, and
caused more than $170
million in damages. It
was the most
destructive tornado in
Utah's history.
Salt Lake City Tornado, Aug.
11, 1999
Orange fireball is a power sub-
station exploding.

13. PROTECTING OURSELVES
Early warnings
Tornado watch
Tornado warning
Taking shelter – down
Basement
In interior room
Under furniture
At a shelter or in a ditch
Tornado survival kit

14. TORNADO PRECAUTIONS
UNDERGROUNDSHELTERS
Crouchdownon yourkneesandprotectyour
headwithyourarms.
Don'trunwhiletornadois approaching becausetheyare
fasterthanus
Lookfor ashelter