BMKG Details Favorable Weather Conditions During Disappearance of Five Journalists Near Mount Anak Krakatau

The disappearance of five journalists, two boat crew members, and a local guide near the volatile Mount Anak Krakatau on Monday, September 7, remains a subject of intense search and rescue operations, alongside rigorous investigation into environmental factors. Ida Pramudawardani, the Acting Director of Public Meteorology at the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG), provided critical meteorological data regarding the conditions at sea during the time the group lost contact. According to official findings, the atmospheric and maritime environment in the immediate vicinity of the volcano was surprisingly benign, shifting the focus of investigators toward other potential hazards associated with the active volcanic eruption.

The incident underscores the inherent dangers faced by media professionals and maritime workers covering natural disasters in remote or high-risk geographic zones. As search teams continue to comb the waters of the Sunda Strait, authorities and press freedom organizations are reviewing the safety protocols and risk assessments required for journalistic expeditions into active volcanic exclusion zones.

Chronology of the Incident

The sequence of events began on Monday, September 7, when a party of eight individuals departed from the Pagedongan Pier in Carita, Pandeglang Regency, Banten province. The group utilized a chartered speedboat to navigate the Sunda Strait, intending to capture footage and report on the renewed eruptive activity of Mount Anak Krakatau, which had escalated significantly over the preceding weekend.

At approximately 14:00 Western Indonesia Time (WIB), communication with the vessel was severed. The sudden loss of contact prompted immediate concern from news desks and families, leading to the rapid deployment of search and rescue operations coordinated by the National Search and Rescue Agency (Basarnas) alongside local maritime authorities and volunteer groups.

The Manifest: Names of the Missing

The vessel carried a total of eight people, comprising members of the national and international press corps, specialized maritime crew, and a regional guide. The journalists on board included M. Bagus Khoirunnas, representing the state news agency ANTARA; Ari Basuki, reporting for Merdeka.com; Yudhis from iNews; and Daus, a correspondent for the international news agency Anadolu. They were accompanied by Donal, an independent freelance photojournalist and reporter.

To navigate the treacherous waters of the Sunda Strait, the group relied on two experienced local boat operators: Warta, 55, and Surakman, 60. Additionally, Heriyanto, 49, served as the local guide tasked with navigating the geographical nuances of the coastal and insular approaches to the volcano. Despite extensive sweeps of the maritime sector between the Sunda Strait islands, the group and their vessel had not been located as of the initial days following the disappearance.

BMKG Meteorological Assessment: Favorable Surface Conditions

Addressing the press at the parliamentary complex in Jakarta on Thursday, September 10, Ida Pramudawardani detailed the comprehensive meteorological analysis conducted by BMKG for the afternoon and evening of the incident. Her findings indicated that surface weather conditions could not be blamed for any immediate maritime distress.

"From 2:00 PM to 6:00 PM, the weather conditions were good. Therefore, there was no indication or detection of rainfall," Ida stated during her briefing.

Meteorological tracking stations and satellite telemetry confirmed that the airspace over the Sunda Strait during the critical hours of the disappearance was characterized by clear to partly cloudy skies. Wind speeds were recorded at a maximum of approximately 15 knots, equivalent to roughly 7.5 meters per second. In maritime terms, a 15-knot breeze generates light to moderate chopping on the water surface, but it poses virtually no threat to a properly handled speedboat of the type utilized by the reporting team.

Furthermore, oceanographic data analyzed by BMKG showed that sea wave heights in the vicinity of Mount Anak Krakatau did not exceed a maximum of one meter. Ida emphasized that these wave heights ensured the physical state of the sea surrounding the volcanic island was stable enough to preclude weather-related capsizing or navigation hazards at the surface level.

The Hidden Threat: Volcanic Ash Dispersion and Upper-Atmosphere Dynamics

While surface weather and sea states were categorized as benign, BMKG’s analysis revealed a significant atmospheric anomaly that posed severe invisible and physical risks to aviation and maritime observers: high-altitude volcanic ash plumes.

Satellite imagery captured by BMKG and international meteorological networks on Monday demonstrated that ash from the ongoing eruption of Mount Anak Krakatau was aggressively driven into the upper atmosphere. Ida noted that ash clouds were actively tracked reaching altitudes of approximately 50,000 feet, which translates to roughly 15,000 meters above sea level.

"Because on that Monday, ash was still being monitored from satellite imagery up to a height of around 50,000 feet, or about 15,000 meters," Ida explained.

This massive vertical dispersion of volcanic particulate matter highlights the sheer intensity of the eruption cycle that drew the journalists to the region. While high-altitude ash primarily presents a severe hazard to commercial aviation by clogging jet engines, dense localized fallout, sulfur dioxide gas emissions, and floating pumice rafts can severely impact surface visibility, respiratory health, and marine engine cooling systems. Volcanic ash mixed with atmospheric moisture can also create localized acidic precipitation or reduce visibility drastically if wind currents shift the plume downward toward sea level.

Background Context: The Volcanic Activity of Anak Krakatau

Mount Anak Krakatau, meaning "Child of Krakatoa," has been one of Indonesia’s most closely monitored and volatile geological features since it emerged from the caldera of the legendary Krakatoa volcano in 1927. Situated in the Sunda Strait between the islands of Java and Sumatra, the volcano has experienced frequent eruptive phases, most notably the catastrophic flank collapse and subsequent tsunami in December 2018 that claimed hundreds of lives along the coastal regions of Banten and Lampung.

The renewed activity observed in early September 2018—and recurring cycles in subsequent years—regularly triggers exclusion zones enforced by the Center for Volcanology and Geological Hazard Mitigation (PVMBG). Authorities typically prohibit vessels and unauthorized personnel from entering a radius of several kilometers around the active crater due to the constant threat of sudden explosive eruptions, ballistic projectile ejections, and localized tsunamis generated by submarine pyroclastic flows.

Journalistic Risks and Institutional Safety Protocols

The disappearance of the five journalists has reignited a critical discourse within Indonesian media circles regarding safety protocols, hazard awareness, and the balance between public information needs and personal risk management. Covering natural disasters, particularly volcanic eruptions and seismic events, requires specialized training in hostile environments, adherence to official exclusion zones, and the use of personal protective equipment such as hard hats, respirators, and life jackets.

Press freedom advocates and journalistic associations have expressed deep concern over the welfare of the missing reporters. Professional organizations often point out that competitive pressure to secure exclusive visual documentation of major natural phenomena can inadvertently lead reporters and independent crews to bypass safety boundaries or underestimate the unpredictable nature of active geological hazards.

Search and Rescue Operations and Ongoing Challenges

Rescue efforts led by Basarnas, supported by the Indonesian Navy (TNI AL), the Water Police (Polairud), and local fishermen, have faced numerous operational challenges. The search zone spans a wide maritime corridor characterized by complex currents, fluctuating winds, and the continuous hazard of ongoing volcanic activity from Anak Krakatau, which has occasionally forced search teams to temporarily withdraw to safer distances.

Search coordinators have deployed sonar equipment, helicopters, and fast response boats to scan both the surface waters and the remote, rocky shorelines of the surrounding islands, including Sertung, Panjang, and Rakata. Despite these exhaustive measures, as of the latest operational updates, authorities have yet to recover the vessel or any definitive traces of the missing passengers and crew.

Implications and Future Outlook

The tragedy surrounding the disappearance of the journalists near Mount Anak Krakatau serves as a sobering reminder of the physical perils inherent in disaster reporting. The detailed meteorological disclosures by the BMKG effectively rule out standard weather disturbances or high waves as the primary catalyst for the incident, intensifying scrutiny on the immediate environmental impacts of the volcanic eruption itself—such as sudden toxic gas releases, thermal updrafts, or localized ash-induced engine failures.

As search and rescue operations enter an extended phase, government agencies, media institutions, and safety regulators are expected to re-evaluate inter-agency coordination, maritime monitoring, and compliance enforcement within designated volcanic danger zones. The incident underscores the urgent necessity for standardized, rigorous safety frameworks for all media personnel operating in high-risk zones, ensuring that the pursuit of vital public information does not come at the ultimate cost of human safety.