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PSWS UpdatedWhen any Tropical Cyclone Warning Signal Number is hoisted or put in effect for the first time, the corresponding meteorological conditions are not yet prevailing over the locality. This is because the purpose of the signal is to warn the impending occurrence of the given meteorological conditions. It must be noted also that the approximate lead time to expect the range of the wind speeds given for each signal number is valid only when the signal number is put in effect for the first time. Thus, the associated meteorological conditions are still expected in at least 36 hours when TCWS #1 is put in effect initially; in at least 24 hours with TCWS #2; in at least 18 hours with TCWS #3, in at least 12 hours with TCWS #4; and in at least 12 hours with TCWS #5. The lead time shortens correspondingly in the subsequent issues of the warning bulletin when the signal number remains in effect as the tropical cyclone comes closer.

It is also important to remember that tropical cyclones are constantly in motion; generally towards the Philippines when PAGASA is issuing the warning. Therefore, the Tropical Cyclone Warning Signal Number over a threatened/ affected locality may be sequentially upgraded or downgraded. This means that TCWS #1 may be be upgraded to TCWS #2, then to TCWS #3, TCWS #4 and to TCWS #5 as necessary when a very intense typhoon is approaching or downgraded when the typhoon is moving away. However, in case of rapid improvement of the weather condition due to the considerable weakening or acceleration of speed of movement of the tropical cyclone moving away from the country, the downgrading of signal may jump one signal level. For example, TCWS #3 may be downgraded to TCWS #1 or all signals from TCWS #2 may be lowered.

The delineation of areas for a given signal number is based on the intensity, size of circulation and the forecast direction and speed of movement of the tropical storm or typhoon at the time of issue of the warning bulletin. The change in intensity, size of circulation or movement of the tropical cyclone also determines the change in the TCWS number over a given locality.

Tropical Cyclone Warning Signal #1


WINDS: 30-60 kph may be expected in at least 36 hr
SEA CONDITIONS (Open Sea)
Wave Height: 1.25-4.0 meters

DAMAGE TO STRUCTURE:

DAMAGE TO VEGETATION:

Tropical Cyclone Warning Signal #2


WINDS: 61-120 kph may be expected in at least 24 hr
SEA CONDITIONS (Open Sea)
Wave Height:4.1-14.0 m
Storm surge possible at coastal areas.

DAMAGE TO STRUCTURE:

DAMAGE TO VEGETATION:

Tropical Cyclone Warning Signal #3


WINDS: 121-170 kph may be expected in at least 18 hr
SEA CONDITIONS (Open Sea)
Wave Height: > 14.0 meters
Storm surge possible at coastal.

DAMAGE TO STRUCTURE:

DAMAGE TO VEGETATION:

Tropical Cyclone Warning Signal #4


WINDS: 171-220 kph may be expected in at least 12 hr
SEA CONDITIONS (Open Sea)
Wave Height: more than 14.0 meters
Storm surge 2-3m possible at coastal areas.

DAMAGE TO STRUCTURE: DAMAGE TO VEGETATION:

Tropical Cyclone Warning Signal #5

PSWS no 5
WINDS:
 > 220 kph may be expected in at least 12 hr
A Super Typhoon will affect the locality.

SEA CONDITIONS (Open Sea)
Wave Height: more than 14.0 m
Storm surge more than 3 meters possible at coastal areas

DAMAGE TO STRUCTURE:

DAMAGE TO VEGETATION: