BMKG’s deputy for meteorology, Guswanto, said here on Monday that the seeds of tropical cyclone 91S have been observed in the Indian Ocean west of Bengkulu.
He informed that based on observations, cyclone 91S is located around 4.3 degrees south latitude (LS) and 91.6 degrees east longitude (BT) and has a maximum wind speed of 15 knots and a minimum air pressure of 1008.5 millibars (mb).
"The potential for this seed to grow into a tropical cyclone in the next 24 hours is in the low category," he said.
In the next 24 hours, the 91S seeds could cause moderate to heavy rainfall in Bengkulu and Lampung, he added.
In addition, the 91S seeds could cause wave heights of 1.25–2.5 meters in the eastern waters of the Nias Islands and the eastern waters of Sipora Island-Pagai Island.
Then, wave heights of around 2.5–4.0 meters could be observed in the waters of Simeulue Island and the waters west of the Nias Islands to the Mentawai Islands.
Waves of similar height could also be seen in the waters of Enggano-Bengkulu Island, West Lampung waters, and the Indian Ocean in the western part of Mentawai Islands to the south of Banten.
Meanwhile, higher waves of around 4.0–6.0 meters could occur in the Indian Ocean west of Nias.
Meanwhile, for tropical cyclone 91B, Guswanto said the cyclone seed has been observed in the Indian Ocean northwest of Aceh, precisely at 6.6 degrees north latitude (N) and 93.3 degrees east longitude (East), with a maximum wind speed of 15 knots and a minimum pressure of 1005 mb.
“In the next 24 hours, (this cyclone will) move westward and the potential for this seed to grow into a tropical cyclone in the next 24 hours is in the low category," he added.
He said the 91B seeds could trigger rainfall of moderate to heavy intensity in Aceh and North Sumatra in the next 24 hours.
Seed 91B could also cause waves of 1.25–2.5 meters in height in Sabang-Banda Aceh waters.
Then, waves as high as 2.5–4.0 meters could potentially be recorded in the northern part of the Malacca Strait.
Meanwhile, wave heights of 4.0–6.0 meters could occur in the northern waters of Sabang, Aceh's western waters, and the Indian Ocean in the western part of Aceh.
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