(UPDATE)Typhoon "Nona" downgraded into TS; TD "Onyok" enters PAR

December 17, 2015 6:55 am 

By Christopher Lloyd T. Caliwan

MANILA, Dec. 16 (PNA) – The Philippine Atmospheric, Geophysical and Astronomical Service Administration (PAGASA) on Wednesday downgraded Typhoon “Nona” into a severe tropical storm as it moved slowly towards the West Philippine Sea.<PAGASA, at the same time, said that tropical depression "Onyok" entered the country.

As of 4 p.m. Wednesday, the center of Severe Tropical Storm “Nona” was located about 70 km Southwest of SBMA, Olongapo City, Zambales (14.4°N, 119.8°E), packed with maximum sustained winds of 100 kph near the center and gustiness of 130 kph. It was forecast to move Northwest at 7 kph and exit the Philippine Area of Responsibility (PAR) by Saturday.

Meanwhile, public storm warning signal no. 2 (61-120 kph expected in 24 hours) was hoisted over the provinces of Bataan, Southern Zambales, Cavite, Batangas and Lubang Island

Signal no. 1 (30-60 kph expected in 36 hrs) was hoisted over Metro Manila, rest of Zambales, Pampanga, Bulacan, Tarlac, Rizal, Laguna, Northern Occidental Mindoro and Northern Oriental Mindoro.

Flashfloods and landslides are expected over the areas under Public Storm Warning Signals.

Storm signals elsewhere have been lifted.

The estimated rainfall amount is from heavy to at times intense within the 250 km diameter of the typhoon.

Meanwhile, PAGASA weather forecaster Mar Villafuerte said the tropical depression outside the PAR has already enter the PAR and locally named "Onyok", the 15th tropical cyclone that entered the country this year.

Villafuerte said tropical depression Onyok enters PAR around 1:45 p.m. and as of 4 p.m. the center of Tropical Depression Onyok was estimated based on all available data at 860 km East of Mati City, Davao Oriental (7.5°N, 134.0°E) packed with maximum sustained winds of 45 kph near the center. It was foprecast to move West Northwest at 20 kph.

So far, TD Onyok still does not directly affect the country, he said.

But with its present speed and movement, TD Onyok is expected to make a landfall in Caraga Region by Friday afternoon and affect the eastern section of Mindanao.

He noted the TD Onyok has slim chance to intensify into tropical storm category.

He added the two tropical cyclone inside the PAR has slim chance of “Fujiwhara effect” or the interaction between two nearby cyclones, where the stronger one may “pull” the weaker one.

Villafuerte said severe tropical storm Nona is too far that can pull TD Onyok.

The phenomenon starts when two weather disturbances come within 1,000 to 1,500 kilometers of each other and the “Fujiwhara effect” usually ends when one of the two storms weakens or its “movement” is disrupted by another stronger weather system, the weather agency said.

In the next 24 hour forecast, PAGASA said that stormy weather will be experienced over the provinces of Occidental Mindoro including Lubang Island, Northern Oriental Mindoro, Bataan, Batangas and Cavite with rough to very rough seas.

Rains with gusty winds is expected over Metro Manila, Pampanga, Southern Zambales, Bulacan, Laguna, Rizal, Calamian group of islands and the the rest of Oriental Mindoro.

Cloudy skies with moderate to occasionally heavy rains and isolated thunderstorms will be experienced over Northern Luzon while light to moderate rains will be experienced over the rest of Luzon and Western Visayas.

Partly cloudy to cloudy skies with isolated rainshowers or thunderstorms will prevail over the rest of the country.

It added moderate to strong winds blowing from the east to northeast will prevail over the rest of Luzon and coming from the southwest to southeast over Visayas. The coastal waters along these areas will be moderate to rough. Elsewhere, winds will be light to moderate coming from the southwest with slight to moderate seas.

The state-run weather bureau also issued a gale warning due to the effects of "Nona" as the sea condition would be rough to very rough due to strong to gale force winds is expected to affect the seaboards of Northern and Central Luzon and western seaboards of Southern Luzon.

"Fishing boats and other small seacraft are advised not to venture out into the sea while larger sea vessels are alerted against big waves," it warned. (PNA)

RMA/CLTC

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