MidLand, Jakarta – Central Java Heavy rain is still possible today, Thursday 8 February 2024. BMKG provides the same early weather warning for 26 other provinces.
Heavy rain, BMKG quoted as saying web.meteo.bmkg.go.id, may be accompanied by lightning and strong winds. On Java island, early weather warning was given in DI Yogyakarta and East Java, in addition to Central Java.
For the weather warning valid from February 7 to 9, BMKG revealed that the seed of tropical cyclone 94P was observed in the Coral Sea, north of Australia. The cyclone seed forms an area of slowing wind speed (convergence) extending from the Arafuru Sea to the vicinity of the cyclone seed location.
BMKG also monitors the presence of cyclonic circulation in the Indian Ocean west of Aceh. This cyclonic circulation forms a convergence in the Indian Ocean west of Lampung.
Other convergence areas were observed extending across Riau, Lampung, Sunda Strait, Java Sea, Indian Ocean south of Java, South Central Kalimantan, South East Kalimantan, North Kalimantan, Flores Sea, Banda Sea, of Seram, Pacific Ocean north of Papua.
Meanwhile, areas where winds meet (confluence) are monitored in the Java Sea, Central and South Sulawesi, Flores Sea and Banda Sea. “These conditions are capable of increasing the potential for rain cloud growth around the cyclonic circulation and along the convergence or confluence,” BMKG said.
Location and causes of extreme rain in Central Java
Announcement
Researcher at the Center for Climate and Atmosphere BRIN, Erma Yulihastin, explained the rainfall pattern in Central Java which recently caused floods in several areas. According to Erma, rain in Central Java tends to be uniform and widespread starting in the afternoon.
“High or extreme intensity is concentrated along the northern coast of Central Java,” he said via X’s social media account, Wednesday, Feb. 7, 2024.
Erma explained that the cause of the extreme rainfall was due to the strong propagation activity of the equatorial atmospheric Rossby waves from east to west. More specifically, this PhD in climatology pointed to the area 105-120 degrees east longitude.
Rossby waves, he said, played a role in adding high moisture from the Pacific Ocean to the convergence area in the Java Sea. “Understand the behavior of extreme rainfall occurring in Jabodetabek, Central Java and East Java so we can increase preparedness,” Erma further said.
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