MANILA (UPDATE) — "Bising" weakened further into a tropical storm on Saturday afternoon as it is expected to leave the country's area of responsibility in the next several hours, PAGASA said.

According to the state weather bureau's 11 p.m. bulletin, Bising (international name: Surigae) maintained its track and is forecast to exit the Philippines on Sunday morning.

The storm currently packs maximum sustained winds of 75 kilometers per hour (kph) near the center with gusts of up to 90 kph. Its gusts had peaked at 240 kph last weekend.

At 10 p.m. Saturday, its center was spotted 1,145 kilometers (km) east of extreme Northern Luzon, moving east southeastward at 20 kph.

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Bising is forecast to weaken further "due to unfavorable atmospheric and oceanic conditions."

The weather disturbance will also bring moderate to rough seas (1.5 to 3.5 meters) over the northern and eastern seaboards of Northern Luzon.

"Mariners of small seacraft are advised not to venture out over these waters. Inexperienced mariners of these vessels should avoid navigating in these conditions," PAGASA warned.

• READ: PAGASA: 'Bising' further weakens over Philippine Sea on way out of PH

The Philippines' second storm this year has killed 4 and damaged some P222 million in crops and infrastructure during its peak, the National Disaster Risk Reduction and Management Council (NDRRMC) earlier said.

Damage to infrastructure in the Bicol region and Eastern Visayas also reached P10.5 million.

The country sees around 20 tropical storms annually.

— With a report from Reuters