This lesson will help you to understand the concept of typhoon formation. After going through this lesson, you are expected to explain how typhoon develops and how it is affected by landmasses and bodies of water

2. Why do
typhoons occur
frequently in
the

3. Our country is an
archipelago surrounded
by the (1) Philippine Sea
(east), (2) Luzon strait
(north), (3) West
Philippine Sea (west) and
(4) Sulu Sea & Celebes
Sea (south)

4. Cyclogenesis
is the process by
which a cyclone
develops and
strengthens.

5. Cyclone
is a spinning wind
around a low pressure
area (LPA) which has
relatively low barometric
pressure reading.

6. Hurricanes
are tropical
cyclones that form
in the Atlantic
Ocean.

8. Tropical Depression
If the speed of the
maximum sustained winds
near the center or eye of
the cyclone is 30-60 km/hr
and expected within 36
hours.

9. Tropical Storm
If the speed is 60-100
km/hr and expected
within 24 hours
Typhoon
If the speed is 100-185
km/hr and expected
within 18 hours

10. Super Typhoon
If the speed of the
maximum sustained winds
near the center or eye of
the cyclone is 185 km/hr
and above and expected
within 12 hours.

11. PROCESS INVOLVED IN THE
FORMATION OF TYPHOON
Water evaporates from
warm ocean water

12. Intense Low Pressure
Area forms over ocean
surface. Tropical
Depression is formed.

13. Low Pressure Area
draws in air from
surrounding HPA.
Wind develops as air
moves from HPA to
LPA.

14. W
A
R
M
A
I
R
R
I
S
E
S
C
O
O
L
A
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R
S
I
N
K
S
LPA
HPA
CONDENSATION
C
O
O
L
A
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R
S
I
N
K
S
Mixing at
cloud
edge

15. Earth’s rotation causes
winds to move counter
clockwise in the
Northern Hemisphere
and clockwise in the
Southern Hemisphere

17. The is the center of
the spiral (dark portion)
that extends about 20-
50 km in diameter.

18. How landforms and
bodies of water
affects
TYPHOONS?

19.  As a typhoon moves
from water into land,
it tends to weaken
because of the
decrease warm water
supply.

20.  Strong wind shear
usually associated
with mountains can
also rip a cyclone
apart.

21.  Bodies of water tend to
strengthen cyclones –
the longer a cyclone
stays over water, the
stronger & more
devastating it becomes.

22. What are the
“ingredients” for a
typhoon to
develop?

23. Supply of wind
Water
heat

25. PHILIPPINE AREA OF RESPONSIBILITY

26. Probinsiya ng Leyte hinagupit ng super typhoon Yolanda
Published November 9, 2013 4:22pm
By GMA News
Mahigit isang daang mga katawan ang nakitang nakahandusay sa kalsada ng
Tacloban City sa Leyte matapos itong hagupitin ng Super Typhoon Yolanda nitong
Biyernes.
"100-plus dead, lying in the streets, with 100 plus injured…this report was relayed to
us by our station manager so it is considered very reliable information," pahayag ni
Civil Aviation Authority of the Philippines deputy director general John Andrews sa
isang panayam sa telebisyon.
"According to the station manager, the airport is completely ruined,” dagdag pa nito,
matapos tanggapin ang ulat ng opisyal nang magkaroon ito ng pagkakataon na
tumawag sa head office sa Manila gamit ang isang high-frequency radio.
Hinagupit ng Bagyong Yolanda ang Leyte at ang karatig nitong probinsiya na Samar
na may lakas ng hanging umaabot sa 315 kilometro kada oras. Ang super typhoon na
ito ang itinalang pinakamalakas ng bagyo sa buong mundo ngayon taon.
Simula nang hagupitin ng Bagyong Yolanda ang Eastern Visayas noong Biyernes,
wala nang komunikasyon mula sa mga taga-Leyte at Samar dahil nasira ang mga
cellsite.