PHIVOLCS reported that during 11-17 April white steam plumes from Mayon drifted NW, WNW, WSW, and SW.
Crater incandescence was visible at night.
The sulfur dioxide flux was 2,800, 1,918, 1,621, and 1,617 tonnes/day on 11, 12, 13, and 16 April, respectively.
The Alert Level remained at 2 (on a 0-5 scale) and PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone and the 7-km Extended Danger Zone on the SSW and ENE flanks.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)