Based on the Tropical Cyclone Bulletin # 11 issued at 11:00 AM today by the Philippine Atmospheric Geophysical and Astronomical Services Administration (PAGASA), the province of Albay has been placed under Tropical Cyclone Warning Signal No. 2 due to Tropical Storm “DANTE.” Tropical Storm “DANTE” is expected to be over the coastal waters of Eastern Albay Province by the morning or early afternoon of 2 June 2021 . Due to its trajectory, and potentially heavy to at times intense rainfall, “DANTE” can be expected to generate volcanic sediment flows or lahars, muddy streamflows or muddy run-off in rivers and drainage areas of Mayon Volcano. DOST-PHIVOLCS thus strongly recommends increased vigilance and readiness of communities in pre-determined zones of lahar and related hazards.

Prolonged and heavy rainfall may generate post-eruption lahars on major channels draining Mayon Volcano by incorporating loose material from remnant pyroclastic density current (PDC) deposits from the January-March 2018 eruption. The bulk of erodible PDC deposits occupies the watershed areas of the Miisi, Mabinit, Buyuan and Basud Channels. In addition, older and erodible eruption deposits occupy the watershed areas on the eastern and western slopes of the edifice and can be remobilized as non-eruption lahars by erosion of banks and channel beds. Potential lahars and sediment-laden streamflows may occur along the Miisi, Binaan, Anoling, Quirangay, Maninila, Masarawag, Muladbucad, Nasisi, Mabinit, Matan-ag, and Basud, Bantayan Channels in Albay Province. Mayon lahars can threaten communities along the middle and lower slopes and downstream of these channels with inundation, burial and wash out.

DOST-PHIVOLCS strongly advises the communities and local government units of the above identified areas of risk to continually monitor the typhoon conditions and take pre-emptive response measures for their safety from “DANTE.”