Lumajang Declares Hydrometeorological Disaster Alert Over Mount Semeru Lahar Risk
The Lumajang Regency government in East Java has declared a two-month hydrometeorological disaster alert, from November 2, 2026 to January 1, 2027, due to the risk of lahar (rain-triggered volcanic mudflow) from Mount Semeru. The measure aims to strengthen disaster preparedness during the seasonal transition. This is in East Java, not Bali, but relevant for travelers passing through or visiting the Bromo-Tengger-Semeru area.
The Lumajang Regency government in East Java province has declared a hydrometeorological disaster alert status in response to the potential risk of "lahar hujan" (rain-triggered cold lava/mudflow) from Mount Semeru. The alert period runs for two months, from November 2, 2026 to January 1, 2027, aimed at strengthening disaster preparedness during the transition from dry to rainy season.
On the ground, heavy equipment has reportedly been used to repair and clear lahar flow channels from Mount Semeru in Desa Supiturang, Pronojiwo Subdistrict, Lumajang. Mount Semeru is one of Indonesia's most active volcanoes, and rainfall following volcanic activity can trigger lahar flows carrying volcanic ash and rock debris, which can impact surrounding communities and infrastructure.
While this alert applies to Lumajang Regency in East Java rather than Bali itself, it is relevant information for travelers crossing between Java and Bali overland, or those planning trekking tours to the Bromo-Tengger-Semeru National Park area.
Things to Consider
If you plan to visit the Bromo-Tengger-Semeru National Park area or travel through Lumajang, check local volcanic activity updates and weather warnings before departure. When traveling overland between Java and Bali, check road conditions along river basins that could be affected by lahar flows during heavy rain, and consider alternative routes or adjusting travel timing. Confirm the latest safety information with trekking tour operators before booking.
Source: ANTARA News Bali