Jakarta, domclub Indonesia
—
The end of the year is not just the peak
rainy season
for the Indonesian region, but also the period when various triggering atmospheric dynamics occur
extreme weather
such as Asian monsoons to tropical cyclones.
“The period December to February (DJF) is not only about the rainy season, but also busy weather activity in our seas. Like a highway when going home, the atmosphere above Indonesia is also being “densely crawling” due to various wind phenomena which make the sea more turbulent,” wrote the Meteorology, Climatology and Geophysics Agency (BMKG) on Instagram, Monday (1/12).
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The end-of-year weather dynamics in Indonesia are quite busy, one of which is the Asian monsoon winds which blow from Asia towards Australia.This wind is the main trigger for high waves in most of Indonesia’s deep waters.
Then, there are also alun or swell waves where areas facing the open ocean, such as the waters west of Sumatra and the south of Java-NTT which face the Indian Ocean, as well as the waters of Papua which face the Pacific Ocean receive waves sent from the middle of the Ocean.
These conditions make the wave height remain in the medium to high category or more than 1.5 meters.
Then, during this period tropical cyclones were present in the southern hemisphere and triggered a significant increase in wind speed and wave height, especially in the waters of the southern part of Indonesia.
BMKG said the Asian monsoon in December was just starting to warm up.Signs of this can be seen in the South China Sea to the waters of the Natuna Islands where the wind speed has started to get stronger and reached more than 18 km/hour.
However, in Indonesia’s deep waters such as the Karimata Strait, Java Sea and Banda Sea, wind strength is still relatively slow, between 11-18 km/hour.
Shifting to January, the Asian monsoon works optimally with wind gusts that are not only strong, but also extend to all deep waters such as the Karimata Strait, Java Sea, Maluku Sea, Halmahera Sea, and even the Banda Sea.
Wind speed in the waters increased above 18.5 km/hour (>10 knots), making the sea more turbulent with high waves of more than 1 meter.
In February, the Asian monsoon usually weakens with a decrease in wind speed in Indonesian waters, so that the waves also gradually decrease.
However, activities in the waters need to remain vigilant, especially areas directly connected to the ocean because the waves have not completely subsided.
Apart from the monsoon, the atmospheric and marine systems in Indonesia are also influenced by several phenomena such as ENSO and IOD which have annual periods.
Apart from that, there are also atmospheric waves such as MJO, Kelvin and Rossby which have weekly-monthly periods.
There are also land wind and sea breeze phenomena with daily periods, as well as other phenomena such as Cold Surge, Borneo Vortex, and tropical cyclones.
All of these phenomena play a major role in shaping weather conditions in Indonesia.
Furthermore, Indonesia’s topography, which is composed of tens of thousands of islands and hundreds of mountains, means that the wind does not always blow straight.Winds in Indonesia move in curves following gaps between islands, mountains, hills and valleys, creating varying wind and wave patterns.
(lom/dmi)
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