RAMMB/US NOAA/Himawari 8 

MANILA — A low pressure area formed over the West Philippine Sea outside on Tuesday afternoon, PAGASA said.  

The LPA was located 305 kilometers southwest of Kalayaan, Palawan, outside the Philippine area of responsibility (PAR), the state weather bureau said.

It said the LPA had a medium chance of developing into a tropical depression in the next 24 hours but would not enter the PAR.

However, its trough or extension will affect Palawan.

Palawan recently recorded its heaviest 24-hour rainfall due to the shear line, the zone where intense thunderstorms form from the convergence of the cool northeast monsoon or Amihan and the warm and moist easterlies.

Puerto Princesa City received 352 millimeters of rain between 8 a.m. February 9 and 8 a.m. February 10, according to PAGASA data.

This is almost 12 times the normal rainfall for February, which is the driest month in the city. It also topped the previous heaviest 24-hour precipitation record in Palawan of 317.6 mm observed on August 13, 1979 in Coron town.

— With a report from Ariel Rojas, ABS-CBN News