Communities around Mayon Volcano were urged to stay alert on Monday, November 24, 2025, as heavy rains from Tropical Depression #VerbenaPH and the shear line threatened to trigger dangerous lahars across several towns in Albay.

In its lahar advisory issued at 2:30 p.m., PHIVOLCS said strong to intense rainfall could loosen old volcanic materials on Mayon’s slopes and send fast-moving volcanic mudflows into rivers and low-lying areas.

PHIVOLCS said the rain may erode remnant pyroclastic deposits from the 2018 and 2023 eruptions. 

The agency warned that communities along the Miisi, Binaan, Mabinit, Buyuan, Anoling, Matanag, Bonga, and Basud channels may face severe threats from sudden lahar flows.

It added that older deposits on the volcano’s southwest side, which have been feeding lahar flows during heavy rains, may again affect communities in Guinobatan through the Masarawag and Maninila channels.

PHIVOLCS said lahars from Mayon can carry large rocks and heavy debris strong enough to bury homes, inundate roads, and push materials out to sea.

The agency advised local governments and residents in identified hazard zones to monitor rainfall closely and prepare for possible pre-emptive evacuation if conditions worsen.