This 7x-speed footage captures a massive pyroclastic flow racing down Indonesia’s Mount Semeru as the volcano unleashed a powerful eruption. | AccuWeather

PYROCLASTIC FLOW A pyroclastic flow is a fast-moving current of extremely hot gas, volcanic ash, and rock fragments that rushes down the slopes of a volcano during explosive eruptions. These flows can reach speeds of over 320 km/h and temperatures exceeding 1,000 °C, making them one of the most dangerous volcanic hazards. Unlike lava flows, pyroclastic flows can travel great distances, destroy everything in their path, and cause widespread devastation due to their speed, heat, and suffocating as

MAYON LOGS LARGEST PYROCLASTIC FLOW #MayonVolcano generated its largest pyroclastic density current (PDC) to date at 10:35 a.m. Monday, sending volcanic material down the Mi-isi Gully for about four kilometers, #PHIVOLCS reported. The PDC produced a brownish ash plume more than two kilometers high that drifted southwest, causing ashfall in several barangays of Camalig and Guinobatan. PHIVOLCS said Alert Level 3 remains in effect, and entry into the six-kilometer-radius Permanent Danger Zone is s