TYPHOON
G8 lesson
TYPHOON CAN BE FOUND IN
THE TROPOSPHERE
TROPOSPHERE
troposphere is the layer of our atmosphere
with the most mass and the greatest
variation in temperature.
SUN
Sun is the primary source of radiation that warms the Earth’s surface.
ACRONYM TO REMEMBER
PAR- Philippine Area of Responsibility
PAGASA- Philippine Atmospheric,
Geophysical and Astronomical Services
Administration
ITCZ- Intertropical Convergence Zone
CONDUCTION AND CONVECTION
Through conduction and convention, the heat energy is
transferred from one place to another.
Example
Convection mixes warm, moist air with
cold air that leads to the formation of
low-pressure system that serves as the
basis for typhoon formation.
TYPHOON
a weather phenomenon that is common in
the Philippines
An average of 22 typhoons every year are
formed in the south-western part of the
North Pacific Ocean and about 19 of which
enter the Philippine Area of Responsibility
(PAR).
TYPHOONS CAN BE NAMED ACCORDING
TO WHERE IT IS ORIGINATED OR LOCATED
TROPICAL CYCLONE (HURRICANE)
if located in North Atlantic,
Eastern North Pacific and in the
South Pacific Ocean,
TYPHOON
typhoon if the location is in Western
North Pacific Ocean,
CYCLONE
Located in the Bay of Bengal and
Arabian Sea and Western South
Indian Ocean
“WILLY-WILLY”
Located in the Southern
Indian Ocean
SEVERE TROPICAL CYCLONE
in the Western South Pacific and
Southeast Indian Ocean
TROPICAL CYCLONE
in the Southwest Indian
Ocean.
The Philippines is located in the
Western North Pacific Ocean
therefore we call tropical cyclone as
typhoon.
HOW TYPHOON STARTED?
1. warm ocean water is the main
source of energy that fuels a
typhoon.
2. When the typhoon makes a landfall,
there is not much source of
evaporating moisture; hence, its
main energy source is removed.
3. This could cause the typhoon winds
to slow down.
4. Furthermore, friction against the
land could further slow it down,
especially if there are rugged
terrains and mountain ranges that
block the winds. There are also
landforms like coastal barrier islands
that act as the first line of defense
against typhoons and provide
protection for aquatic habitats.
FORMATION OF A TROPICAL CYCLONE
1. Tropical cyclone is a rapid rotating storm originating over tropical oceans from
where it draws the energy to develop.
2. It is fueled by the heat released when moist air rises and condenses.
3. It has an EYE with the lowest air pressure and wind speed. It measures 200 to
500 km but can reach up to 1000 km in diameter and the weather is normally
calm and free of clouds.
4. The EYEWALL is where wind speed is great and is surrounded by rainbands
that contain showers and thunderstorms. A tropical cyclone brings very violent
winds, heavy rain, high waves and, in some cases, very destructive storm surges
and coastal flooding. The winds blow counterclockwise in the Northern
Hemisphere and clockwise in the Southern Hemisphere.
TYPHON FORMATION
5. Most tropical cyclones form over vast ocean areas covered by very
warm moist air masses. The water in such areas are warmer than the
surrounding waters higher than 26o C or at least 27oC to a depth of
around 46 meters (150 ft.). such areas are found near the Equator
where the Northeast Trade Winds and the Southeast Trade Winds
met, forming the Intertropical Convergence Zone (ITCZ).
6. The twisting forces of the Earth’s rotation cause the spinning of the
winds of the cyclone, starting from the twirling of the opposing trade
winds around each other. The spinning wind of the cyclone creates a
rotating low-pressure area that pushes air towards the center and
forces hot moist air to rise and cool off. This cooling of the air causes
its moisture to condense, which causes heat to escape. This heat is
thrown off during condensation further warms the air, which
becomes lighter and rises fast.
7. As more moist air replaces the rising air, more condensation takes
place, so air at the center rises faster and faster. Tropical cyclones
form over oceans of the world except in the South Atlantic Ocean and
in the Southeastern Pacific. During the Southern Hemisphere
Summer, the intertropical front in these areas moves only a degree or
so south of the equator which is not far enough for the Coriolis force
to become effective. In the Pacific Ocean, the tropical cyclones that
form normally move slowly towards the west or west northwest,
threatening the Philippines. They usually move at an average speed
of 19 kilometers per hour, often guided by the main airflow above
them. Those that form in the South China Sea move generally
northward or toward the northeast which also affects the Philippines.
SUMMARY OF
FORMATION OF A
TROPICAL TYPHOON
PARTS OF
TYPHOON
a. Eye - with the lowest
air pressure and wind
speed and the weather
is normally calm and
free of clouds
b. Eyewall - wind speed
is great and known as
its sustained winds area
c. Rainbands - contain
showers and
thunderstorms
PARTS OF A TYPHOON
an EYE with the lowest air pressure and wind speed. It
measures 200 to 500 km but can reach up to 1000 km in
diameter and the weather is normally calm and free of clouds.
EYEWALL is where wind speed is great and is surrounded by
rainbands that contain showers and thunderstorms.
EYEWALL its sustained winds area
Rainbands - contain showers and thunderstorms
CATEGORY OF TROPICAL CYCLONE
SEQUENCE OF STORM STAGES IS IN THE
CORRECT ORDER
1. Tropical Depression,
2. Tropical Storm,
3. Severe Tropical Storm,
4. Typhoon,
5. Super Typhoon
HOW CAN A TYPHOON WEAKEN AND
DISAPPEAR WHILE IT’S INSIDE THE PAR?
A typhoon can eventually weaken and
disappear when it stays much longer in
the land and can no longer extract
energy from warm waters.
COPY AND ANSWER
ON YOUR SCIENCE
NOTEBOOK
PART 1
COPY AND ANSWER ON YOUR SCIENCE
NOTEBOOK (PART 1)
COPY AND ANSWER ON YOUR
SCIENCE NOTEBOOK (PART 2)
PART 3 (LABEL THE PARTS OF A TYPHOON AND
DESCRIBE EACH PART)- YOU HAVE TO DRAW
END
PREPARE FOR A QUIZ
