Jakarta, The Indonesia Post – The Meteorology, Climatology and Geophysics Agency (BMKG) said the potential for extreme weather such as hail, heavy rain and tornadoes could still occur until March-April due to transitions.
“We urge the public to remain alert to the possibility of the potential for extreme weather and the impact it can have,” said BMKG Deputy for Meteorology Guswanto in a statement received in Jakarta, Tuesday.
Extreme weather events in the form of hail phenomena have occurred in the past week in several areas such as Surabaya, Lampung, Bekasi, and others. The incident was accompanied by heavy rains of short duration accompanied by lightning and strong winds.
The hail phenomenon is one of the extreme weather phenomena that occurs on a local scale and is characterized by the presence of droplets of ice that fall from the clouds and can occur within a period of several minutes.
The phenomenon of hail can occur because it is triggered by the presence of convective patterns in the atmosphere on a significant local-regional scale.
Hail can be formed from a Cumulonimbus (Cb) type convective cloud system which generally has towering dimensions which indicate that there is significant air lability in the cloud system so that it can form ice grains in clouds with a size large enough.
The large dimensions of the ice grains and the strong flow of air falling in the CB cloud system or what is known as the downdraft can cause the ice grains with a fairly large size that are formed at the top of the Cb cloud to fall to the cloud base until they come out of the cloud and become a hail phenomenon.
The significant “downdraft” speed of Cb clouds can cause ice grains that come out of the cloud not to melt quickly in the air, and even when they fall to the earth’s surface they are still in the form of ice grains known as hail phenomena, said Guswanto. (ojn/bbs)
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