Storm Signal No. 5 officially added by PAGASA

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(CNN Philippines) — The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) has announced a revised public storm warning system and an updated classification of tropical cyclones.

Public Storm Warning Signal (PSWS) No. 5 has been added to the state weather bureau's public storm warning signal.

The new storm warning signal classifications system is as follows:

  • PSWS No. 1: tropical cyclone winds of 30 to 60 kph are expected within the next 24 hours

  • PSWS No. 2: tropical cyclone winds of 61 to 120 kph are expected within the next 24 hours

  • PSWS No. 3: tropical cyclone winds of 121 to 170 kph are expected within the next 18 hours

  • PSWS No. 4: tropical cyclone winds of 171 to 220 kph are expected within the next 12 hours

  • PSWS No. 5: tropical cyclone winds of more than 220 kph are expected within 12 hours

PAGASA modified the public storm warning signal because tropical cyclones have become more intense recently.

Aside from the revised storm warning system, the classifications of tropical cyclone has also been modified.

Below are the classifications of tropical cyclones according to the strength of the associated maximum sustained winds:

  • Tropical Depression (TD): up to 61 kph
  • Tropical Storm (TS): 62 to 88 kph
  • Severe Tropical Storm (STS): 89 to 117 kph
  • Typhoon (TY): 118 to 220 kph
  • Super Typhoon (STY): exceeding 220 kph

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PAGASA adopted the modified classifications of tropical cyclones on May 1, 2015.