Thunderstorms and heavy rainfall are forecasted to occur starting from 30 January 2026, 12:50 WIB in parts of Sumatera Utara especially in: Afulu, Bahorok, Bandar, Batang Kuis, Batang Serangan, Beringin, Binjai Selatan, Binjai Timur, Bintang Bayu, Dolok Masihul, Dolok Sanggul, Gebang, Gido, Harian, Hilimegai, Hinai, Kuala, Labuhan Deli, Lahewa Timur, Lolomatua, Lubuk Pakam, Medan Amplas, Nainggolan, Onan Ganjang, Onohazumba, Onolalu, Padang Tualang, Pagar Merbau, Pakkat, Pangaribuan, Panombeian Pane, Pantai Cermin, Pantai Labu, Parlilitan, Patumbak, Perbaungan, Percut Sei Tuan, Pollung, Raya, Salak, Secanggang, Sei Bamban, Sei Bingei, Sei Suka, Sei. Rampah, Serba Jadi, Siantar Marihat, Siantar Marimbun, Sibiru-Biru, Sijamapolang, Sipahutar, Sipispis, Sirapit, Sitelu Tali Urang Julu, Sogae'Adu, Tanjung Beringin, Tanjung Morawa, Tanjung Pura, Tapian Dolok, Teluk Mengkudu, Ulunoyo. 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 30 January 2026, 15:50 WIB.