Understanding Typhoons PDF

LEARNING GOALS Explain how a typhoon develops and how it is affected by landmasses and bodies of water.  TRUE or FALSE 1. Typhoons are bigger than cyclones, cyclones are bigger than hurricanes 2. Hurricanes are stronger than typhoons and cyclone 3. Hurricanes, typhoons and cyclones a...

LEARNING GOALS Explain how a typhoon develops and how it is affected by landmasses and bodies of water.  TRUE or FALSE 1. Typhoons are bigger than cyclones, cyclones are bigger than hurricanes 2. Hurricanes are stronger than typhoons and cyclone 3. Hurricanes, typhoons and cyclones are the same but occur in different geographical area. DID YOU KNOW THAT… According to the Philippines, Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), about 20 tropical cyclones enter the Philippine Area of Responsibility each year HURRICANE HURRICANE TYPHOON North Atlantic ocean and Northwest Pacific ocean or near Northeast Pacific the South China Sea CYCLONE CYCLONE South Pacific and Indian ocean TROPICAL CYCLONE Is the generic term use by meteorologist to describe a rotating, organized system of clouds and thunderstorms that originates over tropical or subtropical waters and has closed, low-level circulation. Tropical depressions – are the weakest tropical cyclones.  When do tropical cyclones occur? Tropical cyclones occur every year during the late summer months: July–September in the Northern Hemisphere January–March in the Southern Hemisphere. CHECK UP! 1. How many typhoons enter the Philippines every year? 2.What is PAGASA? 3.What is the difference between typhoons and hurricanes? 4.Why are typhoons given a name?  DEVELOPMENT OF A TYPHOON (TROPICAL CYCLONE) CYCLOGENESIS -The process by which a cyclone develops and strengthen. CAUSES of TROPICAL CYCLONE Pre-existing weather disturbance Warm tropical oceans Moisture Relatively light winds The formation of typhoon involves the following processes: 1. Evaporation of water at the ocean surface with a temperature of 26.5 – 27 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 affect.  Factors That Weaken Typhoon Typhoon may become stronger if conditions become favorable for cyclone to develop. But it may not intensify due to the several factors: 1. Cold Waters - the absence of moisture from warm ocean water means the absence of typhoon’s “fuel” source. 2. No water - a typhoon will deteriorate once its eye moves over the land. The air overland cools quickly due to causing the typhoon to quickly lose intensity. 3. Wind shear - refers to the difference in wind speed. Ana COOL AIR COOL AIR HIGH PRESSURE HIGH PRESSURE Eye of the Storm LOW PRESSURE COOL AIR HIGH PRESSURE  PARTS OF A TYPHOON THE EYE a central region of clear skies (calm)warm temperatures, and low atmospheric pressure. THE EYEWALL the most dangerous and destructive part where winds are strongest, and rainfall is heaviest. RAINBANDS compact regions of vertical air movement surrounding the eye. These are clouds that spin. Effects of Tropical Cyclone (Typhoon) Strong Winds Tornadoes Rainfall and Flooding Storm surge  Why is Philippines prone to typhoons? 1.What is it about Philippines that makes it a target for typhoons?  Why is Philippines prone to typhoons? 1. The Philippines lies at the western rim of the Pacific Ocean, north of the equator. 2.It is bounded on the west by the West Philippine Sea, on the east of Pacific Ocean, on the north by the Bashi channel and on the south by the Sulu and Celebes Sea. 3.Tropical Zone – the Philippines is located within the geographic area.  Why is Philippines prone to typhoons? 4.The Philippine climate has a tropical climate. 5.Northeast monsoon from November to April and southwest monsoon from May to October.  SYNTHESIS ❑ A typhoon forms when the winds blow into areas of the ocean where the water is warm. ❑ The winds rotate or spin around a center called an eye due to the Coriolis force. ❑ Air moves from the high-pressure area toward the low-pressure area. ❑ Typhoon features include: Eye Eye wall Rain bands