Answer:
When any Public Storm 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.
Hence, the signals used was PSWS #1 to PSWS # 4 with the addition of time element:
PSWS # 1: Winds 30-60 kph -expected in at least 36 hrs;
PSWS # 2: Winds >60-100 kph -expected in at least 24 hrs;
PSWS # 3: Winds >100-185 kph -expected in at least 18 hrs; and
PSWS # 4: Winds >185 kph -expected in at least 12 hrs.
Explanation:
