The document defines and describes various weather disturbances including thunderstorms, tropical cyclones such as tropical depressions, storms, typhoons and hurricanes, tornadoes, monsoons, and the Intertropical Convergence Zone. Thunderstorms are small-scale storms producing lightning, heavy rain, and sometimes hail. Tropical cyclones are low pressure systems forming over tropical oceans with strong winds and thunderstorms. Tornadoes are violently rotating columns of air extending from thunderstorms to the ground. Monsoons are seasonal reversing winds with corresponding precipitation changes. The Intertropical Convergence Zone is where winds from the northern and southern hemispheres converge near the equator.

1. Weather Disturbances
Presented by:
Enguito, Damsel F.
BSED-4A Bio.Sci.

2. What is a weather disturbance?
• A weather disturbance is a general term
that describes any pulse of energy
moving through the atmosphere.

3. What are weather
disturbances?
1. Thunderstorm
2. Tropical Cyclones
a. Tropical depression
b. Tropical Storm
c. Typhoons/Hurricanes
3.Tornado
4. Monsoons
5. Intertropical Convergence Zone(ITCZ)

4. Thunderstorm

5. Thunderstorm
• It is a small-scale weather system in
which lightning and thunder produced by
a funnel-shaped cumulonimbus cloud.
• It is also known as an electrical storm,
a lightning storm, thundershower or
simply storm.
• It usually produces gusty, heavy rains,
and sometimes hail.

6. Video clip

7. Tropical Cyclones

8. Tropical Cyclone
• A tropical cyclone is a generic term for
an organized storm system of
thunderstorms that are not based on a
frontal system.
• It is a low pressure system that
generally forms over tropical ocean
areas, and brings wind and
thunderstorms.
• Comes from the Greek word “kyklos”,
which means “coiling snake”.

9. • Tropical
Depression
Once a group of
thunderstorms has come
together under the right
atmospheric conditions
for a long enough time,
they may organize into a
tropical depression.
Winds near the center
are constantly between
20 and 34 knots (23 -
39 mph).

10. • Tropical Storm
A tropical storm is an
organized system of
strong thunderstorms
with a defined surface
circulation and maximum
sustained winds between
17 and 33 meters per
second (34 to 63 knots,
39 to 73 mph, or 62 to
117 km/h). At this point,
the distinctive cyclonic
shape starts to develop,
though an eye is usually
not present.

11. • Typhoon
A typhoon is a name
used in east Asia for a
Hurricane. It is a type
of cyclone occurring in
the western regions of
the Pacific Ocean. A
typhoon is similar to a
hurricane in levels of
destructiveness. The
word typhoon comes
from the Chinese term
“tai-fung” meaning
great wind.

12. • Video clip

13. Tornado

14. Tornado
A tornado is a narrow,
violently rotating column
of air that extends from
the base of a
thunderstorm to the
ground. Because wind is
invisible, it is hard to see
a tornado unless it forms
a condensation funnel
made up of water
droplets, dust and debris.
Tornadoes are the most
violent of all atmospheric
storms.

15. • Video clip

16. Monsoons
• Monsoon is traditionally defined
as a seasonal
reversing wind accompanied by
corresponding changes
in precipitation but is now used
to describe seasonal changes in
atmospheric circulation and
precipitation associated with
the asymmetric heating of land
and sea. Usually, the term
monsoon is used to refer to the
rainy phase of a seasonally-
changing pattern, although
technically there is also a dry
phase.

17. Northeast Monsoon Southwest Monsoon

18. • Video clip

19. Intertropical Convergence
Zone (ITCZ)

20. Intertropical Convergence Zone
(ITCZ)
• The Intertropical Convergence Zone (ITCZ),
known by sailors as The Doldrums, is the area
encircling the earth near the equator where
winds originating in the northern and southern
hemispheres come together.
• The ITCZ was originally identified from the
1920s to the 1940s as the "Intertropical
Front" (ITF), but after the recognition in the
1940s and 1950s of the significance of wind
field convergence in tropical weather
production, the term "ITCZ" was then applied

21. • Video clip