MANILA, Philippines (UPDATE) – The state weather bureau on Monday said it is monitoring an active low pressure area (ALPA) off Mindanao that can develop into a tropical cyclone.
Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said the ALPA was spotted 870 kilometers east of Mindanao as of 10 a.m.
The LPA could develop into a tropical cyclone as it gathers strength over water. It is forecast to bring moderate to heavy rains and thunderstorms over Mindanao, particularly in Lanao del Norte and the provinces of Agusan, Surigao, Davao and Misamis.
Residents in low-lying areas are warned against possible landslides and flash floods.
In an earlier interview with radio dzMM, PAGASA forecaster Connie Rose Dadivas said the rains being felt in Visayas and Mindanao are also due to the Intertropical Covergence Zone (ITCZ).
The ITCZ is formed when trade winds from the southern and northern hemispheres meet, creating thunderstorm-producing cloud bands.
The weather bureau said the months of September and October mark the transition period from southwest monsoon (habagat) to northeast monsoon (amihan).
Amihan affects the eastern portions of the country from October up to late March. It starts over Siberia as a cold, dry air mass but gathers moisture as it travels across the Pacific Ocean before reaching the eastern sections of the Philippines.
It is characterized by widespread cloudiness with rains and showers.