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Sagot :
Answer:
When any Tropical Cyclone Warning Signal (TCWS) 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.
Explanation:
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