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The Philippines is a typhoon-prone country, with approximately twenty tropical cyclones entering its area of responsibility per year. Locally known generally as bagyo (), [3] typhoons regularly form in the Philippine Sea and less often, in the South China Sea, with the months of June to September being the most active, August being the month with the most activity.
PAGASA's Tropical Cyclone Intensity Scale [1] [2] Category Sustained winds Super typhoon (STY) ≥185 km/h ≥100 knots: Typhoon (TY) 118–184 km/h 64–99 knots: Severe tropical storm (STS) 89–117 km/h 48–63 knots: Tropical storm (TS) 62–88 km/h 34–47 knots: Tropical depression (TD) ≤61 km/h ≤33 knots
Since 1963, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) has assigned local names to a tropical cyclone should it move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N-25°N, even if the cyclone has had an international name assigned to it.
In the Philippine languages, tropical cyclones are generally called bagyo. [1] Climatologically, in the Northwest Pacific basin, most tropical cyclones develop between May and October. However, the Philippines can experience a tropical cyclone anytime in the year, with the most storms during the months of June to September.
The TCWS system is the consequence of decades of evolution of early warning systems for tropical cyclones in the Philippines. The first tropical cyclone warning in the country was issued in July 1879. In 1931, the earliest formalized warning system for tropical cyclones was implemented by PAGASA's predecessor, the Philippine Weather Bureau. [5]
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Filipino: Pangasiwaan ng Pilipinas sa Serbisyong Atmosperiko, Heopisiko at Astronomiko, [4] abbreviated as PAGASA, which means "hope" as in the Tagalog word pag-asa) is the National Meteorological and Hydrological Services (NMHS) agency of the Philippines mandated to provide protection against natural calamities ...
TCWS #1 winds of 39–61 km/h (21–33 kn; 24–38 mph) are prevailing or expected to occur within 36 hours: TCWS #2 winds of 62–88 km/h (33–48 kn; 39–55 mph) are prevailing or expected to occur within 24 hours
If a tropical cyclone intensify further and reaches wind speeds of 90 knots (170 km/h; 100 mph), it will be classified as an intense tropical cyclone. A very intense tropical cyclone is the highest category on the South-West Indian Ocean Tropical Cyclone scale, and has winds of over 115 knots (213 km/h; 132 mph). [24] [25]