MANILA (UPDATE) - Typhoon Ompong continued to weaken as it made its way out of the Luzon landmass shortly before noon Saturday, state weather bureau PAGASA said.

Ompong, the strongest storm to hit the country this year, continues to move west at 25 kilometers per hour (kph) while packing maximum sustained winds of 170 kph and gusts of up to 260 kph, PAGASA said in its 11 a.m. bulletin.

As of 10 a.m., the storm was spotted 30 kms off the coast of Laoag, Ilocos Norte, weather forecasters said.

PAGASA has downgraded typhoon warning signal no. 4 earlier raised over several areas.

The following storm warning signals are still raised:

SIGNAL NO. 3

• Cagayan including Babuyan Group of Islands
• Batanes
• Ilocos Sur
• Ilocos Norte
• La Union
• Mountain Province
• Benguet
• Ifugao
• Kalinga
• Apayao
• Abra

SIGNAL NO. 2

• Isabela
• Nueva Vizcaya
• Pangasinan
• Tarlac
• Nueva Ecija
• Aurora
• Zambales
• Quirino
• Pampanga
• Bulacan

SIGNAL NO. 1

• Bataan
• Rizal
• Metro Manila
• Cavite
• Batangas
• Laguna
• Lubang Island
• Northern Quezon including Polillo Island

Visayas and Mindanao will also experience rains as Ompong continues to enhance the southwest monsoon (habagat), PAGASA said.

The state weather bureau warned against possible flooding and landslides in Western Visayas, Zamboanga Peninsula, Autonomous Region in Muslim Mindanao, MIMAROPA and Bicol, where moderate to heavy rains will prevail.

Light to moderate rains will also be experienced over Eastern and Central Visayas, PAGASA said.

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As Ompong weakened, Filipinos should remain vigilant against possible landslides and flooding, Mahar Lagmay, executive director of the UP Resiliency Center, said Saturday.

"We're not yet out of the woods. Although the typhoon has weakened already, there are still storm signals hoisted," he told ANC.

"We must be on guard against possible flooding and landslides, these are the possible hazards associated with the typhoon," he added.

Ompong is expected to exit the Philippine area of responsibility before dawn Sunday, PAGASA said.