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MANILA, Philippines (UPDATED) – Typhoon Yolanda (international codename Haiyan) continues to intensify as it approaches the Philippines, and 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 Luzon.
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
Below is a list of 14 previous storms since 1991 that prompted the hoisting of Public Storm Warning Signal No. 4.
| Typhoon (with international name) | Maximum Wind Speed (JWTC data) | Areas Placed Under Signal #4 | Aftermath |
|---|---|---|---|
| Trining (Ruth) Oct 24 to 31, 1991 |
215 km/h | Batanes Calayan & Babuyan group of islands northern Cagayan |
83 dead 22 missing 55 injured P3.719-B worth of damage |
| Goring (Koryn) Jun 23 to 27, 1993 |
195 km/h | Isabela Aurora Quirino |
51 dead 5 missing 109 injured P2.775-B worth of damage |
| Rosing (Angela) Oct 30 to Nov 4, 1995 |
215 km/h | Camarines Norte Camarines Sur Catanduanes northern Albay Quezon (including Polillo Islands) Rizal Metro Manila Southern Tagalog provinces Lubang Island Bataan Bulacan |
936 dead 376 missing 4,152 injured P10.799-B worth of damage |
| Iliang (Zeb) Oct 11 to 16, 1998 |
205 km/h | Batanes Cagayan Isabela northern Aurora Quirino |
46 dead 29 missing 63 injured P5.375-B worth of damage |
| Loleng (Babs) Oct 15 to 25, 1998 |
155 km/h | Catanduanes | 303 dead 29 missing 751 injured P6.787-B worth of damage |
| Harurot (Imbudo) Jul 19 to 23, 2003 |
165 km/h | Cagayan Isabela northern Aurora |
64 dead 2 missing 154 injured P3.234-B worth of damage |
| Igme (Mindulle) Jun 25 to Jul 2, 2004 |
175 km/h | Batanes Calayan & Babuyan group of islands northern Cagayan Apayao Ilocos Norte |
55 dead 20 missing 47 injured P2.447-B worth of damage |
| Yoyong (Nanmadol) Dec 1 to 4, 2004 |
165 km/h | Isabela Aurora Quirino northern Quezon (including Polillo Islands) Camarines Norte Catanduanes |
73 dead 24 missing 168 injured P560.829 M worth of damage |
| Paeng (Cimaron) Oct 27 to 31, 2006 |
185 km/h | southern Cagayan Isabela Quirino northern Aurora |
32 dead 23 missing 62 injured P1.292-B worth of damage |
| Queenie (Chebi) Nov 8 to 12, 2006 |
185 km/h | Isabela Aurora Quirino |
1 dead 10 injured no significant damage caused |
| Reming (Durian) Nov 28 to Dec 3, 2006 |
195 km/h | southern Quezon Camarines Norte Camarines Sur Catanduanes Albay (including Burias Island) Marinduque |
734 dead 762 missing 2,360 injured P5.448-B worth of damage |
| Juan (Megi) Oct 15 to 21, 2010 |
230 km/h | Cagayan Isabela Ifugao Mountain Province |
31 dead 4 missing 42 injured P11.528-B worth of damage |
| Mina (Nanmadol) Aug 21 to 29, 2011 |
185 km/h | Calayan & Babuyan group of islands northern Cagayan |
36 dead 8 missing 37 injured P2.089-B worth of damage |
| Odette (Usagi) Sept 16 to 21, 2013 |
205 km/h | Batanes | 3 dead 2 missing P60-M worth of damage (agricultural crops only) |
– Rappler.com
Sources: PAGASA, Joint Typhoon Warning Center (JWTC), Wikipedia, gov.ph, philstar.com
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