The tail-end of a frontal system, easterlies, and northeast monsoon or hanging amihan will continue to affect parts of Luzon on Sunday, November 29.

The easterlies are warm winds coming from the Pacific Ocean, while the northeast monsoon refers to cold winds from the northeast.

The frontal system, meanwhile, is the boundary between the easterlies and the northeast monsoon, explained the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA).

In an online briefing past 5 am on Sunday, PAGASA said the tail-end of a frontal system and the easterlies will cause scattered rain showers and thunderstorms in these areas:

• Cagayan Valley
• Cordillera Administrative Region
• Bicol
• Aurora
• Quezon

The northeast monsoon, meanwhile, will trigger rain in the following areas:

• rest of Central Luzon
• rest of Calabarzon
• Metro Manila
• Ilocos Region

The rest of the Philippines may also have isolated rain showers or thunderstorms on Sunday, due to the easterlies.

PAGASA warned areas affected by the 3 weather systems to watch out for possible flash floods and landslides during periods of moderate to heavy rain. (READ: FAST FACTS: Tropical cyclones, rainfall advisories)

A flood bulletin was again issued at 7 am on Sunday for the Cagayan River Basin.

PAGASA’s Cagayan River Basin Flood Forecasting and Warning Center noted that light to moderate rain is seen to persist in the next 12 hours.

The water level of the Cagayan River and its tributaries continues to slowly rise, and flooding is still possible in low-lying areas in Isabela and Cagayan.

Below are the parts of the river and the corresponding areas likely to be affected, based on PAGASA’s flood bulletin.

Upper Cagayan (including tributaries Ganano and Magat)

• Isabela – San Agustin, Jones, Echague, Alicia, Angadanan, Cauayan, Naguilian, Reina Mercedes, San Mateo, Cabatuan, Aurora, Luna

Middle Cagayan (including tributaries Siffu-Mallig and Pinacanauan rivers of Ilagan, Tumauini, San Pablo)

• Isabela – Gamu, Ilagan, San Mariano, Tumauini, Delfin Albano, Sto Tomas, Cabagan, Sta Maria, San Pablo

Lower Cagayan (including tributaries Pinacanauan de Tuguegarao, Chico, Pared, Dummun)

• Cagayan – Peñablanca, Tuguegarao City, Enrile, Solana, Iguig, Amulung, Alcala, Baggao, Lasam, Gattaran, Lal-lo, Camalaniugan, Aparri, Tuao, Piat, Sto Niño

Here is the full flood bulletin:

Meanwhile, PAGASA is also monitoring a low pressure area (LPA) outside the Philippine Area of Responsibility (PAR).

The LPA was located 1,500 kilometers east of Mindanao before dawn on Sunday, and is likely to enter PAR in the next 24 hours.

PAGASA Weather Specialist Benison Estareja said the LPA only has a slim chance of developing into a tropical depression, for now.

But he warned that it would bring rain in the next 2 to 3 days as it heads for the Visayas-Southern Luzon area.

More updates on the LPA are expected in the coming days.

So far, the Philippines has had 21 tropical cyclones in 2020, already above the yearly average of 20. (READ: LIST: PAGASA’s names for tropical cyclones in 2020)

For the next 6 months, these are PAGASA’s estimates for tropical cyclones inside PAR:

• December 2020 – 1 or 2
• January 2021 – 0 or 1
• February 2021 – 0 or 1
• March 2021 – 0 or 1
• April 2021 – 0 or 1
• May 2021 – 0 or 1

La Niña has been underway since October, causing more rain than usual in the country.

The northeast monsoon also began in November, bringing cold temperatures. – Rappler.com