Thunderstorms and heavy rainfall are forecasted to occur starting from 15 March 2026, 15:00 WIB in parts of Sumatera Utara especially in: Adian Koting, Alasa Talumuzoi, Andam Dewi, Angkola Barat, Angkola Sangkunur, Angkola Selatan, Aramo, Babalan, Barus, Barus Utara, Batang Natal, Batang Toru, Berampu, Besitang, Boronadu, Botomuzoi, Brandan Barat, Danau Toba, Dolok Sanggul, Gebang, Gunungsitoli, Gunungsitoli Alo'Oa, Gunungsitoli Barat, Gunungsitoli Idanoi, Gunungsitoli Selatan, Gunungsitoli Utara, Harian, Hibala, Hiliduho, Hilimegai, Hilisalawa'Ahe, Hiliserangkai, Hinai, Huruna, Kerajaan, Lingga Bayu, Lolofitu Moi, Lolomatua, Lolowau, Lotu, Ma'U, Mandrehe, Mandrehe Utara, Mazo, Moro'O, Nainggolan, Namohalu Esiwa, Natal, O'O'U, Onan Ganjang, Onan Runggu, Onohazumba, Padang Tualang, Pagindar, Pahae Jae, Pahae Julu, Pakkat, Pangaribuan, Pangkalan Susu, Parbuluan, Parlilitan, Parmonangan, Pasaribu Tobing, Pematang Jaya, Pergetteng Getteng Sengkut, Pollung, Pulau-Pulau Batu, Pulau-Pulau Batu Timur, Pulau-Pulau Batu Utara, Ranto Baek, Salak, Sawit Seberang, Secanggang, Sei Lepan, Sianjar Mula Mula, Siatas Barita, Sidikalang, Siempat Rube, Sijamapolang, Silahisabungan, Sinunukan, Sipahutar, Sipoholon, Sirandorung, Sitelu Tali Urang Jehe, Sitinjo, Sitolu Ori, Somolo-Molo, Sosor Gadong, Stabat, Sumbul, Susua, Tanah Masa, Tanjung Pura, Tarabintang, Tarutung, Tinada, Ulu Moro'O, Ulugawo, Ulunoyo, Ulususua, Umbunasi, 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 15 March 2026, 18:00 WIB.