A low pressure area (LPA) was bringing rain to the southern and central portions of Luzon on Sunday, September 19.
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) said in an advisory at 11 am on Sunday that the LPA was located 90 kilometers northeast of Borongan City, Eastern Samar.
Moderate to heavy rain will persist in these areas on Sunday:
The National Capital Region-PAGASA Regional Services Division also issued a separate rainfall advisory at 11:28 am, saying that light to heavy rain was affecting Metro Manila and Bulacan, aside from Calabarzon.
Other parts of Central Luzon, including Tarlac, Bataan, Zambales, Pampanga, and Nueva Ecija, are expected to have light to moderate rain.
PAGASA advised areas affected by the LPA to watch out for flash floods and landslides. (READ: FAST FACTS: Tropical cyclones, rainfall advisories)
Earlier on Sunday, the weather bureau said the LPA only has a slim chance of developing into a tropical cyclone.
If it does become a tropical cyclone, it would be given the local name Lannie. (READ: LIST: PAGASA's names for tropical cyclones in 2021)
There have been 11 tropical cyclones inside the Philippine Area of Responsibility in 2021. The yearly average is 20.