24/11/2025
KANLAON VOLCANO LAHAR ADVISORY
24 November 2025
2:00 PM
Based on the Philippine Atmospheric Geophysical and Astronomical Services Administration (PAGASA) Tropical Cyclone Bulletin No. 3 and Weather Advisory #18 issued at 11:00AM today, 24 November 2025, Tropical Cyclone βVerbenaβ and the shear line will potentially bring heavy to intense rainfall over several areas of Central Philippines, including Negros Island, in the coming days. This can generate volcanic sediment flows or lahars, sediment-laden streamflows or muddy run-off and related siltation in rivers and drainage areas on Kanlaon Volcano, which is currently at Alert Level 2. DOST-PHIVOLCS thus strongly recommends increased vigilance and readiness of communities in pre-determined zones of lahar and related hazards on this volcano.
Prolonged heavy to intense rainfall may generate life-threatening lahars and sediment-laden streamflows on major channels draining the southern, western and eastern slopes of Kanlaon Volcano. Post-eruption lahars can be generated by intense rainfall eroding loose material from remnant pyroclastic density current (PDC) deposits of the 24 October 2025 explosive eruption and loose ashfall from this as well as from recent ash emission events. In addition, non-eruption lahars can be generated when areas on the upper slopes that have been recently exposed by landslides or weakened during the passage of Typhoon Tino earlier this month become susceptible to failure and feed debris to rivers that have already delivered destructive flows to downstream communities. Communities of Bago City, La Carlota City, La Castellana, Moises Padilla and San Carlos City, Negros Occidental and Canlaon City, Negros Oriental that are situated along the following channels may be affected by lahars and sediment-laden streamflows and related flooding and siltation:
o Ibid River
o Cotcot River
o Talaptapan River
o Malaiba River
o Panubigan Creek
o Buhangin β Indurayan River
o Najalin River
o Inyawan River
o Maragandang River o Panun-an Creek
o Intiguiwan River
o Camansi River
o Maao River
o Tokon-tokon River
o Masulog River
o Binalbagan River
o Taco Creek
o Linothangan River
These communities as well as those further downstream of the above channels are advised to be prepared in case evacuation becomes necessary and to avoid traversing affected streams even those farther downslope of the volcano. Kanlaon lahars, which were shown by Typhoon Tino to be strong enough to transport enormous volumes of gravel and boulders, could threaten communities by their force of impact, 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 rainfall conditions and take pre-emptive response measures for their safety.
DOST-PHIVOLCS
https://vmepd.phivolcs.dost.gov.ph/bulletin/activity-kvo?bid=13245&lang=en
