In a radio interview, Philippine Atmospheric Geophysical and Astronomical Services Administration forecaster Fernando Cada said they have also observed more cloud formations that block the summer heat.
“Ito ang precursor o onset ng rainy season. [Ang] pagsapit ng tag-ulan [maaaring] sa second o third week ng Mayo,” Cada said in an interview on dzBB radio.
He said isolated rain showers are still expected in parts of the country for Monday.
Cada said they are waiting for the southwest monsoon to arrive. He said the monsoon will enhance incoming low-pressure areas.
“Doon ang maramng pagulan at ma-enhance ng habagat kung may dadaan o papasok sa Philippine area of responsibility na bagyo,” he said.
For Monday, Cada said two weather systems are due to affect the country, including the diffused tail-end of a cold front that affects the eastern sections of Northern and Central Luzon.
A second weather system is a trough of a low-pressure area affecting Southern Mindanao.
Cada said Metro Manila will be partly cloudy to cloudy with isolated rain showers especially in the afternoon and evening.
But he said temperatures have been dropping in Metro Manila, from 36-plus degrees Celsius in past weeks to 33.1 degrees Sunday.
Meanwhile, PAGASA said the eastern section of Northern and Central Luzon and Southern Mindanao will experince mostly cloudy skies with scattered rain showers and thunderstorms.
The rest of the counrty will have partly cloudy to cloudy skies with isolated rain showers or thunderstorms mostly in the afternoon or evening, it said in its 5 a.m. bulletin.
PAGASA said light to moderate winds blowing from the northeast will prevail over Northern Luzon and coming from east to southeast will prevail over the rest of Luzon and Visayas and coming from the east to northeast over Mindanao.
The coastal waters throughout the archipelago will be slight to moderate, it added. — RSJ, GMA News