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Aside of this structure, BMKG maintained 181 meteorological, climatological, and geophysical stations which its operations and management performed by 5 regional Indonesian Institutes for Meteorology, Climatology, and Geophysics (Indonesian: Balai Besar Meteorologi, Klimatologi, dan Geofisika, abbreviated BBMKG) responsible.
Floods have hit Jakarta several times in the past, including in 1621, 1654, 1918, 1942, 1976, 1996, 2002, 2007, 2013 and 2015. A significant contributing factor is that a substantial part of Jakarta is low-lying; some 24,000 ha (240 km 2) of the main part of Jakarta are below sea level. [6]
The BMKG claimed the warning was lifted after the tsunami had struck, the timing is clear, but since there was a one-hour time difference between the sunset in Palu and Java where many Indonesian in social media reside, many thought the warning was lifted before the tsunami hit, because the video that circulating around was after the sunset ...
The pilots had informed ATC about their intention to change heading due to the presence of storm system on their route. The Indonesian meteorology office, BMKG, stated that the visibility at the time was around 6 - 10 km and that it was cloudy. It is likely that they were operating in cloud, requiring an upset recovery on instruments.
BMKG warned of heavy rainfall across the island of Java with possible flooding and landslides. [5] On 29 November, Cempaka weakened into a tropical low and turned to the southwest away from Java. [10] It continued moving to the southwest on the following day. [11] TCWC Perth and Jakarta last mentioned Cempaka on 1 December. [12] [13]
According to BMKG, this earthquake was a foreshock to the M w 6.9 earthquake. [23] Despite the earthquake, no increase in activity was recorded for the nearby volcanoes of Rinjani and Agung. [24] At certain areas in the northwestern parts of the island, the earthquake caused the ground to rise by as much as 25 centimetres (9.8 in). [25]
Reports by the Bureau of Meteorology Climatology and Geophysics (BMKG), detailed the tectonic earthquake as measuring 5.6 on the Richter scale (SR) at 14:03:27. The epicenter was 125 km (78 mi) south-west of Bantul , precisely at 8.98 south latitude coordinates (LS) and 110.08 east longitude (BT) at a depth of 10 km (6.2 mi).
Previously, BMKG had issued a high wave warning for the waters of the strait. [19] Tide gauges measured the tsunami at around 90 centimetres (35 in) in Serang and 30 centimetres (12 in) in Lampung , [ 20 ] on top of the two-metre (6 ft 7 in) high tide. [ 21 ]