ALARMING
OBJECTIVES
(DAY 1)
TYPHOONS
• DEFINE TYPHOONS
AND DISCUSS ITS
DIFFERENT TERMS.
• EXPLAIN HOW
TYPHOONS DEVELOP.
• INFER WHY THE
PHILIPPINES IS PRONE
TO TYPHOONS.
SCIENCE 8
PREPARED BY: LOUIE JANE T.
KEY CONCEPTS
• PRESSURE - THE CONTINUOUS PHYSICAL FORCE EXERTED
ON OR AGAINST AN OBJECT BY SOMETHING IN CONTACT
WITH IT.
• ATMOSPHERIC PRESSURE - SOMETIMES ALSO CALLED
BAROMETRIC PRESSURE, IS THE PRESSURE WITHIN THE
ATMOSPHERE OF EARTH.
• LOW PRESSURE - IS A REGION WHERE THE
ATMOSPHERIC PRESSURE IS LOWER THAN THAT OF
KEY CONCEPTS
• CONVERGENT WIND – THE DIFFERENCE BETWEEN
HIGH AND LOW PRESSURE SYSTEMS IN THE
ATMOSPHERE CREATING WINDS.
• HUMIDITY - A QUANTITY REPRESENTING THE
AMOUNT OF WATER VAPOR IN THE ATMOSPHERE OR
A GAS.
WHAT IS
WEATHER?
• WEATHER IS A DAY-TO-DAY CONDITION OF
THE ATMOSPHERE AT A PARTICULAR TIME
AND PLACE.
• WEATHER TAKES PLACE AT THE
TROPOSPHERE.
• WEATHER CHANGES FROM DAY-TO-DAY
BECAUSE THE AIR IN THE ATMOSPHERE IS
CLOUD WATCH
Cumulus
Clear
Sky
Cirru
s
Cirrocumul
us
Stratocumulu
s
Nimbu
s
WEATHER WATCH
Anemomet
er
Barometer
Rain
Gauge
Thermome
ter
TYPHOON
HURRICANE
CYCLONE
Hurricane
Florence
Tropical Cyclone
Ingrid
Super Typhoon Haiyan
PARTS OF A TYPHOON
• EYE -- THIS IS THE CENTER.
IT IS THE CALM PART OF
THE STORM.
• EYE WALL -- THIS PART IS
AROUND THE EYE. THIS
PART HAS THE STRONGEST
WINDS AND RAINS. THE
WINDS MAY BLOW 200
MILES PER HOUR.
• RAIN BANDS -- THESE ARE
PARTS OF A TYPHOON
DEVELOPMENT OF A TYPHOON
(TROPICAL CYCLONE)
CYCLOGENESIS
• THE PROCESS BY
WHICH A
CYCLONE
DEVELOPS AND
STRENGTHEN
THE FORMATION OF A TYPHOON INVOLVES
THE FOLLOWING PROCESSES:
1. EVAPORATION OF WATER AT OCEAN SURFACE TEMPERATURE
OF 26.5 DEGREE CELSIUS.
2. CONVERGENCE OF AIR MASSES OF DIFFERENT
CHARACTERISTICS.
3. HIGH HUMIDITY
4. WARM AIR RISES TOWARD THE COOLER PARTS OF THE
ATMOSPHERE, IT COOLS OFF AND THE WATER VAPOR BEGINS
TO FORM CLOUDS.
5. SUFFICIENT SPIN FROM THE CORIOLIS EFFECT.
WHY PHILIPPINES A TYPHOON-PRONE
AREA?
DEADLIEST CYCLONES
GENERALIZATION
• WHAT IS TYPHOON AND HOW IS IT
DIFFERENT FROM HURRICANE AND
CYCLONE?
• HOW ARE TYPHOONS FORMED?
• WHY PHILIPPINES IS PRONE TO TYPHOONS?