Ppt science 8 lesson 1 2nd quarter
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Typhoons are categorized based on wind speed from tropical depression (below 63 km/h) to violent typhoon (above 249 km/h). They form over warm ocean waters and go through formative, immature, mature, and decaying stages. Typhoons cause damage through strong winds, heavy rain, flooding, landslides. Structural damage includes destroyed or damaged buildings, fallen trees and debris. Economic impacts include loss of life, infrastructure damage, business disruptions. Mitigation includes early warning systems, preparedness plans, and building codes to reduce vulnerability.
Ppt science 8 lesson 1 2nd quarter
- 1. TYPHOON Causes and mechanisms, impacts and effects, and Mitigation
- 2. What is Typhoon? • Tropical Cyclones that develops in the north- western part of the Pacific Ocean between 180° and 100°E. • In the Philippines, tropical cyclones (typhoons) are called bagyo. The term bagyo, a Filipino word meaning typhoon arose after a 1911 storm in the city of Baguio had a record rainfall of 46 inches within a 24-hour period..
- 3. Typhoons are categorized into five: • Category 1 - Tropical Depression -sustains winds between 119 and 153 km/hour (km/h). It is the first notable stage in the formation of a hurricane. (Morakot) • Category 2 - Tropical Storm (TS) - has winds between 154 and 177 km/h. -a tropical storm is a system of intense thunderstorms that progressively intensifies. • Category 3 - Strong Typhoon -A strong typhoon is a system of low pressure and intense winds (between 178 and 209 km/h).(Maemi-South Korea)
- 4. • Category 4 - Intense Typhoon (or Hurricane) -An intense typhoon sustains high winds of 210 to 249 km/h and is classified as a category-5 storm, which carries the highest element of risk. • Category 5 - Violent Typhoon -A violent typhoon is characterized by winds exceeding 249 km/h.
- 5. • Variability in Activity On an annual time scale, activity reaches a minimum in February, before increasing steadily through June, and spiking from July through October, with September being the most active month for tropical cyclones in the Philippines. Activity falls off significantly in November.
- 6. List of Philippine Typhoon (1970-2011) Name Period of occurrence Deaths Damage (in billion) Highest wind speed in kph Areas most affected Sening (Joan) October 11-15,1970 768 10.7 280 Bicol region,calabarzon Herming (betty) August o7- 14, 1987 94 39.9 260 Samar, Bicol Region Ruping (Mike) November 10-14, 1990 748 18.2 285 Cebu C Harurot (Imbudo) July 13- 24,2003 64 3.87 240 Cagayan Valley,CARIlocos region Unding (Muifa) November 14-26,2004 69 3.87 240 Bicol Region, MIMAROPA
- 7. • Milenyo (Xangsane)-2006 • Frank (Fengshen) – 2008 • Ondoy (Ketsana) – 2009 • Bebeng (Aere) – 2011 • Ambo (Mawar) – 2012
- 8. These are the ff. typhoons hits in the Philippines (2012) • AMBO • BUTCHOY • COSME • DINDO • ENTENG • FRANK • GENER • HELEN • IGME • SIONY • TONYO • YOYONG • ZOSIMO • JULIAN • KAREN • LAWIN • MARCE • NINA • OFEL • PABLO • QUINTA • ROLLY • ULYSSES • VICKY • WARREN
- 9. CAUSES OF TYPHOON TRANSFORMATION Pre-conditions and Conditions of Typhoons
- 10. PRE-CONDITIONS OF TYPHOON FORMATION MONSOON TROUGH This is an extension of the Inter- Tropical Convergence Zone where cyclonic spin has developed. The ITCZ is a trough is a low pressure created by the convergence of the northeast and southeast trade winds.
- 11. TROPICAL UPPER TROPOSPHERIC TROUGH The typical low pressure center that forms a typhoon starts at the lower levels and is warm compared to its environment.
- 12. FRONT Stall over tropical water. A front has a cyclonic spin associated with it. If winds aloft become favorable with little wind shear, showers and storms could become more numerous and cause a typhoon to form.
- 13. MESOSCALE CONVECTIVE SYSTEM These organized clusters of storms can move off a continental landmass and drift over warm waters. If they already contain a small vortex in the cluster, this may make to region even more favorable for tropical cyclone development.
- 15. 7 BASINS WHERE TROPICAL CYCLONE DEVELOPS • NORTH ATLANTIC OCEAN June 1- November 30. The most active period runs from about mid August through the latter part of October. ( Caribbean, Bermuda, Central America etc.) • EASTERN NORTH PACIFIC OCEAN May 15 - November 30. This is the second most active region for tropical cyclones in the world. These storms mostly move into the open eastern Pacific Ocean but can affect western Mexico and sometimes after developing, Hawaii.
- 16. • ARABIAN SEA ( Severe Cyclonic Storm) April 1 - December 30. This basin has a double maximum because of the monsoon trough moving through at two different times of the year. • SOUTHWEST PACIFIC OCEAN (STC) October 15 - May 1. These tropical cyclones may affect eastern Australia. • NORTHWEST PACIFIC OCEAN(Typhoon) All year. This is the most active basin in the world. Most typhoons form between July through November. The tropical cyclones that form here can affect the Philippines, Southeast Asia including China and Taiwan, and Japan.
- 17. • SOUTHEAST INDEAN OCEAN ( STC) October 15 - May. These tropical cyclones may affect northern and western Australia. This basin has a double maximum in mid January, and mid February through early March. • SOUTHWEST INDIAN OCEAN ( TC) October 15 - May 15. These tropical cyclones may affect Madagascar and south-eastern Africa. A double maximum occurs in mid January and mid February through early March.
- 18. THE LIFE OF A TYPHOON THE FOUR STAGES OF THE LIFE OF A TYPHOON
- 19. •FORMATIVE STAGE •IMMATURE STAGE •MATURE STAGE •DECAYING STAGE
- 22. BUILDINGS AND INFRASTRUCTURE The two most destructive forces associated with typhoons are wind and rain. According to the Green Fun website, typhoon winds can affect buildings and other structures in two ways: through direct force and through projectiles. The heavy and persistent rainfall that typhoons bring can also have devastating effects. In addition to making homes uninhabitable, the flooding associated with typhoons can make roads impassable, which can cripple rescue and aid efforts.
- 24. WATERCRAFT AND WATER OPERATIONS
- 25. L I F E
- 26. ECONOMICAL EFFECTS • Different countries experience different types of natural calamities. US are known for experiencing devastating hurricanes while Japan is prone to earthquakes and tsunamis. The Philippines, on the other hand, has had its fair share of typhoons and tropical storms. Aside from Ondoy, our country has experienced several devastating typhoons. In the table below, we summarize some of the most financially-damaging typhoons that our country has dealt with
- 27. EFFECT ON THE STOCK MARKET • Aside from the economic effects of typhoons and floods, we also want to show the effect of natural disasters on the stock market. A few days after typhoons Milenyo and Ondoy, the PSE Index was slightly down compared to where it was before the typhoons occurred. Similarly, the PSE Index is down 0.4 percent, on lethargic trading, three days after the peak of the recent rains and floods.
- 28. IMPACTS • Natural disasters can have important implications for public finance. Disasters are likely to result in additional expenditure and/or the partial reallocation of already committed financial resources, with implications for planned investment and other expenditures. Public revenue may also decline as levels of economic activity fall. In consequence, a government may face increasing budgetary pressures which could in turn increase levels of domestic and/or external borrowing or increasing the money supply, each, in turn, with potentially significant knock-on effects (Benson and Clay, 2003). FISCAL IMPACTS
- 30. • Know your enemy: hazards and their effects • Identifying which these are– the elements most at risk– indicates priorities for mitigation. • Vulnerability • Tools, powers and budgets. • PRECAUTIONARY MEASURES • Natural Disaster Reduction Assessment • POLICIES • Suspension of Classes, Work and Activities during Typhoons • DepEd Order No. 28 series of 2005: GUIDELINES ON THE SUSPENSION OF CLASSES WHEN TYPHOONS AND OTHER CALAMITIES OCCUR. • DEPED Order No. 50 s. 2007 with NDCC Memorandum No.7 s. 2006. • Philippine Storm SIGNAL WARNINGS (PSWS)
- 31. CONCLUSION/RECOMMENDATION • Natural disasters, both natural and manmade, can and will occur, often with little or no warning. It has tremendous effect not only physically but also on the mental aspect of an individual especially the younger ones. Disasters often strike without warning and cause damages that limit or prevent an adequate response. We have to commit ourselves to understanding these hazards and to applying techniques that reduce our vulnerability. We need to explore the feasibility of concerted scientific and engineering efforts in reducing the loss of life and property through programs of public education and of effective early warning system. The development of warning systems with adequate range of monitoring instruments for the purpose of collecting necessary data and information for disaster evaluation is necessary for establishing relative potential risks.
- 32. • The development of warning systems with adequate range of monitoring instruments for the purpose of collecting necessary data and information for disaster evaluation is necessary for establishing relative potential risks. Communicate knowledge for people to be aware and get prepared on these hazards. Through public education, introduce precautionary measures to have public awareness on preparedness against these natural hazards. Disasters are inevitable, predictable, and expected; we must be ready to face them. The time has come to fully develop technology for convenient and immediate dissemination of warning system to the public.
- 33. THE PHILIPPINE PUBLIC STORM WARNING SIGNALS • PSWS # 1 • METEOROLOGICAL CONDITIONS: • A tropical cyclone will affect the locality. • Winds of 30-60 kph may be expected in at least 36 hours or • intermittent rains may be expected within 36 hours. (When • the tropical cyclone develops very close to the locality a
- 34. • shorter lead time of the occurrence of the winds will be • specified in the warning bulletin.)
- 35. IMPACT OF THE WINDS • Twigs and branches of small trees may be broken. • Some banana plants may be tilted or downed. • Some houses of very light materials (nipa and cogon) may • be partially unroofed
- 36. • Unless this warning signal is upgraded during the entire • existence of the tropical cyclone, only very light or no • damage at all may be sustained by the exposed • communities. • Rice crop, however, may suffer significant damage when it is • in its flowering stage
- 37. PRECAUTIONARY MEASURES: • When the tropical cyclone is strong or is intensifying and is • moving closer, this signal may be upgraded to the next • higher level. • The waves on coastal waters may gradually develop and • become bigger and higher.
- 38. • The people are advised to listen to the latest severe weather • bulletin issued by PAGASA every six hours. In the meantime, • business may be carried out as usual except when flood • occur. • Disaster preparedness is activated to alert status.
- 39. PSWS # 2 • METEOROLOGICAL CONDITIONS • A tropical cyclone will affect the the locality. • Winds of greater than 60 kph and up to 100 kph may be • expected in at least 24 hours.
- 40. IMPACT OF THE WINDS: • Some coconut trees may be tilted with few others broken. • Few big trees may be uprooted. • Many banana plants may be downed. • Rice and corn may be adversely affected. • Large number of nipa and cogon houses may be partially or • totally unroofed.
- 41. • Some old galvanized iron roofings may be peeled off. • In general, the winds may bring light to moderate damage to • the exposed communities.
- 42. PRECAUTIONARY MEASURES • The sea and coastal waters are dangerous to small seacrafts • Special attention should be given to the latest position, the • direction and speed of movement and the intensity of the • storm as it may intensify and move towards the locality. • The general public especially people travelling by sea and air
- 43. • are cautioned to avoid unnecessary risks • Outdoor activities of children should be postponed. • Secure properties before the signal is upgraded. • Disaster preparedness agencies / organizations are in action • to alert their communities.