The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) declared the start of the rainy season on Wednesday, May 18, citing the widespread rains during the last five days.
“The presence of frontal system and the occurrence of severe thunderstorms have brought widespread rains during the last five days in areas under Type I climate and other parts of the country,” PAGASA said in a statement.
PAGASA defines areas under Type I climate classification as those with two pronounced seasons—dry from November to April and wet during the rest of the year. These include Metro Manila and the western sections of Luzon and Visayas.
“Moreover, southwesterly surface wind flow was also observed during the past few days. This satisfies the criteria of the start of the rainy season over the western sections of Luzon and Visayas,” it said.
PAGASA noted that intermittent rains, associated with the southwest monsoon, locally called “habagat,” will affect Metro Manila and the western sections of the country.
However, it pointed out that breaks in rainfall events, also known as monsoon breaks, which can last for several days or weeks, may still occur.
Meanwhile, PAGASA said the ongoing La Niña may still affect some parts of the country, which may increase the likelihood of above-normal rainfall conditions in the coming months.
The State weather bureau added it will continue to monitor the day-to-day weather and long-term climate situation and provide updates when significant changes occur.