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Analysis of Bima Floods, West Nusa Tenggara (NTB), December 21, 2016
23 Dec 2016 • Read : 3010 x ,

Some media informed that on December 21, 2016 there has been a flood in Bima (8 ° 22'28,42" N, 118 ° 44'5,07" E), especially in 5 districts: Rasanae West, East Rasanae, Raba, Mpunda and Asakota. The flash floods caused by the overflow of the river Paruga. Center of Atmospheric Science and Technology of LAPAN conducted an analysis related to the flood event.

Figure 1. GSMaP time series rainfall in Bima, West Nusa Tenggara

Factors causing flooding in Bima allegedly due to high intensity of rainfall which lasted from about 06.00 pm, reaching a peak at 13.00 pm and has continued until 20:00 pm. Flooding occurred around 14.00 pm. The condition is indicated by the time series of rainfall GSMaP (Figure 1). Spatially, the peak rainfall which occurred at 13.00 pm is shown in Figure 2. This is confirmed by the results of predictive models of the atmosphere in LAPAN's SADEWA on December 20, 2016 at 19:00 pm (Figure 3). Persistent rain with high intensity for up to one hour prior triggered by the Asian monsoon consistently moving from west to east toward the region of Bima. The condition of the sea surface temperature (SST) in the waters around Bima is quite warm (Figure 4) encourage the formation of clouds above it. Low pressure spot in the south Indian Ocean (near Australia) encouraged disturbance dynamics of the atmosphere in the western Indian ocean.

Figure 2. GSMaP spatial rainfall (mm / h) at 13:00 pm December 21, 2016

Figure 3. Rainfall and surface wind prediction of LAPAN's SADEWA at 13:00 pm December 21, 2016 (Initial condition: at 19:00 pm on December 20, 2016)

Figure 4. Sea surface temperature anomalies around the Flores Sea on December 21, 2016 (source:

In general, on December 21, 2016, the condition of the global phenomenon of the influence of sea surface temperature anomalies in the Indian Ocean (IOD) and the Pacific (ENSO) is observed as neutral, as well as the MJO looked weak. So it is strongly suspected that the Asian monsoon factors occur simultaneously with the low-pressure area in the waters of northwest Australia causing high rainfall intensity as the trigger flooding in the area of Bima.

Furthermore, for 3-7 days ahead, the growth of the synoptic scale low-pressure system in western Australia that pose a high wind speed (tropical cyclone Yvette) needs to be monitored because it will affect the intensity of rainfall in the area of Bima and West Nusa Tenggara in general. In addition, for the prediction of the atmosphere every hour for one day can be done by visiting as PSTA LAPAN's research and development results.

Written by:Dissemination Team LAPAN's Center of Atmospheric Science and Technology

Cover picture source: Tempo

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