Republic of the Philippines Department of Science and Technology PHILIPPINE ATMOSPHERIC GEOPHYSICAL AND ASTRONOMICAL SERVICES ADMINISTRAION (PAGASA) Science Garden Compound, Agham Road, Diliman, Quezon City Tropical Cyclone Warning System in the Philippines SAMUEL F. DURAN GENER M. QUITLONG Weather & Forecasting Section Weather Division December 12, 2011
AN AVERAGE OF 100 TROPICAL CYCLONES OCCUR WORLDWIDE; 30 OF WHICH FORM IN THE WESTERN NORTH PACIFIC AREA
Source: Dr. Esperanza O. Cayanan, Southwest Wet Spell
http://kidlat.pagasa.dost.gov.ph/annualreport/annualreport2010.pdf
http://kidlat.pagasa.dost.gov.ph/annualreport/annualreport2010.pdf
24 Hr Public Weather Forecasts and Severe Weather Bulletins Hourly Tropical Cyclone Warning Update Shipping Forecasts and Tropical Cyclone Warning for Shipping Gale Warning Information Meteorological Aviation Services for Aeronautical Users 1 http://kidlat.pagasa.dost.gov.ph/annualreport/annualreport2010.pdf
Source: www.weather.gov.ph
27 26 25 24 23 22 21 20 19 18 17 120 25 20 PHILIPPINE AREA OF RESPONSIBILITY [PAR] 135 25 16 15 15 1 14 13 12 11 10 9 8 7 6 5 4 5 5 115 135 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
Classification of Tropical Cyclone... based on intensity Tropical Depression (TD) wind speed of 45 to 63 kph 1
Classification of Tropical Cyclone... based on intensity Tropical Storm (TS) having a wind speed of 64 to 118 kph 1
Classification of Tropical Cyclone... based on intensity Typhoon (TY) having a wind speed of 118 to 213 kph 1
Classification of Tropical Cyclone... based on intensity SuperTyphoon (STY) having a wind speed of more than 213 kph 1 1
Public Storm Warning Signal Number One (PSWS # 1) 1) A tropical tropical cyclone cyclone may may threaten or or affect affect the the locality. Winds Winds of of not not more more than than 60 60 kph kph may may be be expected in in at at least least 36 36 hours. hours. POTENTIAL POTENTIAL IMPACTS: IMPACTS: Twigs Twigs and and branches branches of of small small trees trees may may be be broken. broken. Some Some banana banana plants plants may may tilt tilt or or land land flat flat on on the the ground. ground. Rice Rice in in flowering flowering stage stage may may suffer suffer significant significant damage. damage. Some Some houses houses of of very very light light materials materials (nipa (nipa and and cogon) cogon) houses houses may may be be partially partially unroofed. unroofed. Very Very light light or or no no damage damage at at all all may may be be sustained sustained by by exposed exposed communities. communities. 1
Public Storm Warning Signal Number Two (PSWS # 2) 2) A moderate tropical tropical cyclone cyclone will will affect affect the the locality. Winds Winds between 61 61 to to 100 100 kph kph may may be be expected in in at at least least 24 24 hours. hours. POTENTIAL POTENTIAL IMPACTS: IMPACTS: Some Some coconut coconut trees trees maybe maybe tilted tilted with with few few others others broken. broken. Few Few big big trees trees maybe maybe uprooted. uprooted. Many Many banana banana plants plants maybe maybe downed. downed. Rice Rice and and corn corn maybe maybe adversely adversely affected. affected. Large Large number number of of nipa nipa and and cogon cogon houses houses maybe maybe partially partially or or totally totally unroofed. unroofed. Some Some old old galvanized galvanized iron iron roofings roofings maybe maybe peeled peeled off. off. Light Light to to moderate moderate damage damage to to the the exposed exposed communities. communities.
Public Storm Warning Signal Number Three (PSWS # 3) 3) A strong strong tropical tropical cyclone cyclone will will affect affect the the locality. Winds Winds of of 101 101 to to 185 185 kph kph may may be be expected in in at at least least18 18 hours. hours. POTENTIAL POTENTIAL IMPACTS: IMPACTS: 1 Many Many coconut coconut trees trees may may be be broken broken or or destroyed. destroyed. Almost Almost all all banana banana plants plants may may be be downed downed and and a a large large number number of of trees trees may may be be uprooted. uprooted. Rice Rice and and corn corn crops crops may may be be uprooted. uprooted. Majority Majority of of nipa nipa and and cogon cogon houses houses maybe maybe unroofed unroofed or or destroyed destroyed and and considerable considerable damage damage to to structures structures of of light light to to medium medium construction. construction. Widespread Widespread disruption disruption of of electrical electrical power power and and communication communication services. services. Moderate Moderate to to heavy heavy damage damage maybe maybe experienced experienced in in the the agricultural agricultural and and industrial industrial sectors. sectors.
Public Storm Warning Signal Number Three (PSWS # 4) 4) A strong strong tropical tropical cyclone cyclone will will affect affect the the locality. Winds Winds of of greater greater than than 185 185 kph kph may may be be expected in in at at least least12 12 hours. hours. POTENTIAL POTENTIAL IMPACTS: IMPACTS: Many Many coconut coconut trees trees may may suffer suffer extensive extensive damage. damage. Many Many large large trees trees may may be be uprooted. uprooted. Rice Rice and and corn corn crops crops may may be be uprooted. uprooted. Majority Majority of of nipa nipa and and cogon cogon houses houses maybe maybe unroofed unroofed or or destroyed destroyed and and considerable considerable damage damage to to structures structures of of light light to to medium medium construction. construction. Widespread Widespread disruption disruption of of electrical electrical power power and and communication communication services. services. Moderate Moderate to to heavy heavy damage damage maybe maybe experienced experienced in in the the agricultural agricultural and and industrial industrial sectors. sectors. 1
250 Number of Landfalling TC's 200 Number of Landfalling TC's 200 Number of non Landfalling TC's 80 67 150 Number of non Landfalling TC's 80 67 77 150 77 88 100 88 87 100 46 126 130 87 111 47 50 30 46 126 130 111 71 47 50 10 6 30 9 18 48 34 44 71 36 17 0 10 13 6 9 11 18 48 34 44 36 17 0 Jan Feb 13 Mar 9 Apr 11 May Jun Jul Aug Sep Oct Nov Dec Monthly Jan Feb Mar Apr May Jun Jul Monthly Mean 0.5 0.3 0.3 0.5 1.1 1.6 3.4 Aug Sep Oct Nov Dec 3.3 3.1 2.7 2.2 1.4 Mean 0.5 0.3 0.3 0.5 1.1 1.6 3.4 3.3 3.1 2.7 2.2 1.4 Number Number of TropicalCyclones of TropicalCyclones 250 1
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