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Reasons for Heavy Rain and Lightning During the Dry Season in Indonesia

Jakarta, CNN Indonesia

Lecturer of the Meteorology College from the Meteorology, Climatology and Geophysics Agency (STMKG) Deni Septiadi revealed the cause hail accompanied by lightning, which has recently occurred in a number of parts of Indonesia, even though it has entered dry season.

“When referring to the position of the sun from North to South, MAM (March-April-May) is a transitional phase from the rainy season to the dry season,” Deni said. CNNIndonesia.com via text message, Friday (20/5).

“Even now some areas in Indonesia have entered the dry season with a peak at JJA (June-July-August),” he added.

The lecturer who is also a researcher in Meteorology from the Meteorology, Climatology and Geophysics Agency (BMKG) explained that microphysically the process of rain or even hail is a complex process of atmospheric dynamics initiated by evaporation, surface heating, convection and supported by the availability of atmospheric aerosol particles as a source of energy. cloud condensation core.

“That is, in the seasons of transition to drought, insolation (incoming solar radiation) the sun can be perfectly received by the surface,” he said.

“Thus, atmospheric lability will be stronger with the potential for cloud growth in this period to be more towering and violent with products such as precipitation, lightning, and wind,” he continued.

Therefore, during this period of seasonal transition, hydrometeorological disasters generally occur, such as flash floods, hail, lightning and cyclones.

Furthermore, another factor that supports the current potential for hail, lightning, and tornadoes is the warm sea surface temperature on the Indonesian Maritime Continent with temperature anomalies ranging from 1 to 3 degrees Celsius.

In addition, Deni said that the moderate La Nina condition was still ongoing with the SST anomaly value at Nino 3.4 of -0.78

“This means that the BMI area is very warm and supports the massive growth of convective clouds,” he explained.

Hail itself is produced by typical Cumulonimbus (Cb) convective clouds, both single-celled and multi-celled with cloud top temperatures ranging from -60 to -80 degrees Celsius.

“As long as the evaporation is not too large, the embryo/hailstone that comes out of the cloud’s internal convective circulation system will remain in the form of solid ice and go to the surface (bottom) as hail (hail),” Deni concluded. .

(lom / fea)

[Gambas:Video CNN]


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