MENGINTIP KONDISI CUACA PENYEBAB BANJIR BESAR DI DKI JAKARTA TANGGAL 25 OKTOBER 2010

Mimin Karmini, Findy Renggono

Abstract


DKI Jakarta dikejutkan dengan hujan deras pada jam 16:00 WIB. Genangan air
langsung terjadi akibat derasnya hujan. Hujan berlangsung sampai sekitar jam 20:00
WIB. Dari data AWS di Jatiwaringin, curah hujan tertinggi sebesar 230 mm tercatat
pada jam 16:00 WIB. Curah hujan sampai jam 19:00 WIB tercatat sebesar 650.60 mm
atau intensitas 216.87 mm/jam untuk periode jam 16:00 s.d. 19:00 WIB. Beberapa
indeks stabilitas, yang dihitung dari data rawinsonde jam 07:00 WIB, menunjukan
potensi terjadinya aktivitas konvektif yang bisa menghasilkan hujan deras. Beberapa
indeks stabilitas yang menunjukan potensi terjadinya proses konvektif kuat adalah: LI
(Lifted Index) = - 06; SI (Showalter Index) = - 0.7; K Index = 36.7; TT (Total Totals) =
43.9. Kejadian hujan paling deras di kawasan barat DKI Jakarta sampai Tangerang.
Genangan air hampir merata di DKI Jakarta dan Tangerang dengan ketinggian yang
bervariasi antara 20 cm – 100 cm.

Jakarta was struck by torrential rain at 16:00 pm. Standing water caused by heavy rain
occured immediately. The rain lasted until around 20:00 pm. From the AWS measurement at Jatiwaringin, highest rainfall of 230 mm was recorded at 16:00 pm. Rainfall amount until 19:00 pm was recorded of about 650.60 mm, in other words rainfall intensity was about 216.87 mm/hour for the period of 16:00 – 19:00 pm. Some stability indices, which is calculated from rawinsonde at 07:00 am showed the potential for convective activity which could produce heavy rain. Some stability indices that show strong potential for convective process are: LI (Lifted Index) = - 06; SI (Showalter Index) = - 0.7; K Index = 36.7; TT (Total Totals) = 43.9. The heaviest rainfall occured in the western region of Jakarta until Tangerang. Stagnant water is almost evenly in Jakarta and Tangerang with varying heights between 20 cm - 100 cm.


Keywords


Intensitas hujan,rawinsonde, radar cuaca, awan konvektif, banjir.

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DOI: http://dx.doi.org/10.29122/jstmc.v12i2.2189

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