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Typhoon Signal Number 4 in PH History

signal-4-philippines-history-20131106Typhoon Yolanda (international codename Haiyan) continues to intensify as it approaches the Philippines, and it is expected be a very destructive super typhoon.

It triggered the announcement of Public Storm Warning Signal Number 4 over eastern Visayas on Thursday, November 7. This is the first time the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) hoisted Signal No. 4 outside the Luzon region.

The term “Signal No. 4” was first used by PAGASA only 22 years ago.

Originally, the weather bureau’s public storm warning system was up to Signal No. 3 only, hoisted over areas expected to be hit by winds exceeding 100 kilometers per hour.

To classify more powerful storms that carry very strong winds, PAGASA created a 4th warning signal in 1991.

In the current system, an area expected to be hit by a storm with winds 185 km/h and above in the next 12 hours would be placed under Public Storm Warning Signal No. 4.

For Signal Numbers 1 to 3, the following conditions should be met:

  • Signal number 1 – winds of 30 to 60 km/h is expected in the next 36 hours
  • Signal number 2 – winds of 61 to 100 km/h is expected in the next 24 hours
  • Signal number 3 – winds of 101 to 185 km/h is expected in the next 18 hours

14 previous storms since 1991 that prompted the hoisting of Public Storm Warning Signal No. 4:

  1. Trining (Ruth)
    Oct 24 to 31, 1991
  2. Goring (Koryn)
    Jun 23 to 27, 1993
  3. Rosing (Angela)
    Oct 30 to Nov 4, 1995
  4. Iliang (Zeb)
    Oct 11 to 16, 1998
  5. Loleng (Babs)
    Oct 15 to 25, 1998
  6. Harurot (Imbudo)
    Jul 19 to 23, 2003
  7. Igme (Mindulle)
    Jun 25 to Jul 2, 2004
  8. Yoyong (Nanmadol)
    Dec 1 to 4, 2004
  9. Paeng (Cimaron)
    Oct 27 to 31, 2006
  10. Queenie (Chebi)
    Nov 8 to 12, 2006
  11. Reming (Durian)
    Nov 28 to Dec 3, 2006
  12. Juan (Megi)
    Oct 15 to 21, 2010
  13. Mina (Nanmadol)
    Aug 21 to 29, 2011
  14. Odette (Usagi)
    Sept 16 to 21, 2013

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