Thunderstorms and heavy rainfall are forecasted to occur starting from 11 November 2026, 22:35 WIB in parts of Sumatera Utara especially in: ADIAN KOTING, AEK SONGSONGAN, ANDAM DEWI, BAHOROK, BALIGE, BANDAR PASIR MANDOGE, BANDAR PULAU, BARUS, BARUS UTARA, BATANG SERANGAN, BATANG TORU, BERAMPU, BESITANG, BONATUA LUNASI, BRANDAN BARAT, DANAU TOBA, DOLOK PARDAMEAN, GAROGA, HABINSARAN, HALONGONAN, HALONGONAN, HARANGGAOL HORISON, HATONDUHAN, HURISTAK, KERAJAAN, KOLANG, KOTANOPAN, KUALUH HULU, KUTABULUH, KUTAMBARU, LAGUBOTI, LUMBAN JULU, MARDINGDING, MUARA BATANG GADIS, PADANG BOLAK, PAGINDAR, PAKANTAN, PANGARIBUAN, PANGKALAN SUSU, PARMAKSIAN, PARMONANGAN, PASARIBU TOBING, PEMATANG SIDAMANIK, PINTU POHAN MERANTI, PORSEA, PURBA, SALAPIAN, SAWIT SEBERANG, SEI BINGEI, SEI LEPAN, SIANTAR, SIANTAR NARUMONDA, SIBORONG-BORONG, SIDAMANIK, SIDIKALANG, SIGUMPAR, SIJAMAPOLANG, SILAEN, SILIMAKUTA, SIMANINDO, SIRAPIT, SITAHUIS, SITINJO, SORKAM, SOSOR GADONG, TAMPAHAN, TANAH JAWA, TAPIAN NAULI, TUKKA, ULU PUNGKUT, ULUAN, WAMPU. These conditions may lead to reduced visibility, strong winds, and localized flooding. The public is strongly advised to remain vigilant during this period, limit outdoor activities, and take all necessary precautions to ensure safety. Conditions are expected to gradually improve by 12 November 2026, 02:35 WIB.