Eight areas in Luzon including Metro Manila are now under public storm warning signal no. 1 as tropical storm “Ruby” has weakened into a tropical depression as it made another landfall in Lubang island, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) on Tuesday said.
PAGASA weather forecaster Glaiza Escullar told the Philippines News Agency (PNA) that Ruby has made its fifth landfall in Lubang Island around 5 a.m.
She said Ruby has weakened into a tropical depression category due to friction or interaction with landmass and also the presence of the northeast monsoon.
She explained that a typhoon needs warm and humid air to be sustained but because of the cold air coming from the northeast monsoon, its strength could decrease.
With the presence of northeast monson as the dominant winds this month, Escullar said Ruby may be downgraded into a low pressure area while exitng the Philippine Area of Responsiblity.
Escullar said that as of 5 a.m. tropical depression Ruby was located at the vicinity of Lubang Islang (13.6°N, 120.4°E) packed with maximum sustained winds of 60 kph near the center. It is forecast to move west at 13 kph
On the other hand, Escullar said Public storm warning Signal No. 1 (Winds of 30-60 kph is expected in at least 36 hours) is now hoisted over Metro Manila, Bataan, Cavite, Laguna, Batangas, Oriental Mindoro, Occidental Mindoro and Lubang Island.
”These areas will have occasional rains with occasional gusty winds,” it warned.
The estimated rainfall amount is from 5 – 15 mm per hour (moderate – heavy) within the 300 km diameter of the tropical depression.
Public Storm Warning Signal elsewhere has been lifted.
Escullar said TD “Ruby” and the northeast monsoon will cause rough to very rough sea conditions over the seaboards of Luzon.
“Fisherfolks and those using small sea craft are advised not to venture out over the said seaboards,” it warned.
Ruby is forecast to be at 375 km west of Ambulong, Tanauan City, Batangas or at 385 km west of Calapan City, Oriental Mindoroby Wednesday morning and is expected to exit the Philippine Area of Responsiblity (PAR) on Wednesday evening.
By Thursday morning, it is expected to be at 700 km west of Calapan City, Oriental Mindoro or outside the PAR.
For Tuesday forecast, PAGASA said Metro Manila and the provinces of Bataan, Cavite, Laguna, Batangas and Mindoro including Lubang island will have rains with gusty winds with moderate to rough seas.
Escullar said due to the northeast monsoon, the rest of Central Luzon and Calabarzon (Cavite, Laguna, Batangas, Rizal and Quezon), Bicol region and Mimaropa (Mindoro, Marinduque, ROmblon and Palawan) will have cloudy skies with light to moderate rainshowers and thunderstorms while Cagayan Valley, Cordillera and Ilocos region will experience cloudy skies with light rains.
She said the weather in the Visayas and Mindanao has gradually improved since Monday afternnon and will be partly cloudy to cloudy with isolated rainshowers or thunderstorms on Tuesday.
It added that moderate to strong winds blowing from the northeast will prevail over the rest of Luzon and coming from the southwest to southeast over the rest of country with moderate to rough seas. PNA