Jakarta, domclub Indonesia
—
A number of regions
Aceh
and North Sumatra were hit by floods and landslides, due to the extreme rain that occurred in the last few days.This cannot be separated from emergence
Senyar Tropical Cyclone
, which is referred to as an anomaly.
The Meteorology, Climatology and Geophysics Agency (BMKG) revealed that Tropical Cyclone Senyar originated from Tropical Cyclone Seed 95B which formed in narrow and shallow waters in the Malacca Strait.
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The appearance of this cyclone also marks a new chapter in the dynamics of extreme weather in the Nusantara Maritime Continent (BMN) region.This is because areas that have been considered impossible to be the birthplace of tropical storms, such as the Malak Strait, actually hold scientific surprises.
“In meteorological records, only a few storms are capable of forming in a narrow area near the equator. The last similar case occurred with Tropical Storm Vamei (2001) which was born in the Natuna Sea,” said Deni Septiadi, BMKG Climatologist, in his statement, Thursday (27/11).
Deni explained that Senyar reached tropical storm status with wind speeds of 70-80 km/hour, and central pressure of 998-1000 mb.The symmetrical convection structure, closed vortex core, and clear pressure center make it fulfill all the criteria for a tropical cyclone, even though it is smaller than large hurricanes in the Indian Ocean.
“Even though it is not as strong as other large storms in the Indian Ocean, the symmetrical convection structure, closed circulation core and clearly defined pressure center fulfill all the criteria for a tropical cyclone,” he said.
The name Senyar was given by the India Meteorological Department (IMD) as the Regional Specialized Meteorological Center (RSMC) New Delhi, in accordance with World Meteorological Organization (WMO) procedures.
Because this storm formed outside the TCWC Jakarta area, its name does not use the name “flower” which is characteristic of cyclones born in Indonesian territory.
Why is it an anomaly?
Tropical storms around Indonesia are generally born when the Asian Monsoon weakens when wind shear is small, circulation is more organized, and concentration of air masses occurs more easily.
Deni explained that based on the theory of atmospheric dynamics (Holton), strong westerly winds from the Indian Ocean entered the Malacca Strait.Pinched by topography, this flow slows drastically, triggering strong convergence.
“Strong westerly winds from the Indian Ocean entered the narrow Malacca Strait, causing it to slow down drastically,” explained Deni.
Convergence increases vorticity (spin), then strengthens the Coriolis effect at latitudes 5-8 degrees N.Warm sea surface temperatures, high humidity, and the release of latent heat strengthen the vortex until it develops into a storm.
In simple terms, the monsoon winds that are “stuck” in the narrow gap of the Malacca Strait experience deflection and rotate violently, then form storms.
Impact on Sumatra
Senyar can trigger a series of extreme weather events ranging from heavy rain to potential coastal flooding, high waves that disrupt shipping, strong winds in western Sumatra, turbulence on flight paths, and coastal activities that are directly affected
Even though it is not as big as a tropical storm in the vast ocean, its location close to land makes its impact significant.
With Indonesia as one of the countries with the highest dominance of hydrometeorological disasters in the world, strengthening science-based monitoring, early warning and public education is becoming increasingly crucial.
(wpj/dmi)
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