.png "Info Pajajaran")
INFOPAJAJARAN.COM - Mount Semeru, located in Lumajang Regency, East Java, Indonesia, exhibited clear weather conditions on Thursday, November 20, 2025, following a recent eruption. The 3,676-meter-high volcano had erupted the previous day, Wednesday, November 19, 2025, releasing a pyroclastic flow extending 14 kilometers into the Besok Kobokan drainage.
Current Visual Observations
Observations from Pronojiwo District revealed brown smoke emanating from the volcano's crater. White smoke plumes were also observed rising from the slopes, particularly along the established lava flows. These visual confirmations highlight the ongoing activity within the volcano, even amidst clear weather conditions.
The Semeru Volcano Observatory Post (PPGA) reported 25 eruptions and 32 instances of lava avalanches within a six-hour period, from 00:00 to 06:00 WIB. Visual observation of the eruptions from the Mount Sawur Post was, however, obstructed. ""Mount Semeru is visible, though shrouded in mist; crater smoke is unobservable,"" noted Yadi Yuliandi, an officer at PPGA Semeru, in a written statement on Thursday, indicating varying visibility conditions around the volcano.
Ashfall Impact and Community Response
The subdistricts of Candipuro and Pronojiwo experienced heavy ashfall since the early hours of the morning. Yayan, a local resident, reported significant ash accumulation, which impaired visibility by coating his glasses. This underscores the immediate impact of volcanic activity on local communities.
In response to the ashfall, Semeru volunteers, led by Santoso, urged residents to wear masks and goggles. This precautionary measure aimed to protect respiratory health and prevent eye irritation due to the heavy ashfall. The advice highlights community resilience and preparedness in facing volcanic hazards.
Evacuation and Further Developments
The eruption prompted the evacuation of 1,131 Lumajang residents, demonstrating the immediate response to protect vulnerable populations. Five evacuation centers were prepared to accommodate those displaced by the volcanic activity. The swift action underscores the seriousness of the situation and the priority given to public safety.
Further updates indicated that the vibrations from the pyroclastic flow were no longer being recorded, yet the alert status remained at Level III (Siaga), signifying continued vigilance. Mount Bromo Tengger Semeru National Park (TNBTS) confirmed the safety of 187 hikers trapped in Ranu Kumbolo, with evacuation efforts underway. These reports reflect ongoing efforts to manage the aftermath of the eruption and ensure the safety of both residents and visitors in the affected areas.
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