Thunderstorms and heavy rainfall are forecasted to occur starting from 06 December 2025, 01:00 WIB in parts of Riau especially in: Bandar Petalangan, Bandar Sei Kijang, Bangkinang, Bangun Purba, Batang Cenaku, Batang Gangsal, Batang Peranap, Bonai Darussalam, Bukit Batu, Bukit Batu, Bukit Kapur, Bukit Raya, Bunut, Concong, Dumai Selatan, Dumai Timur, Gaung Anak Serka, Gunung Sahilan, Hulu Kuantan, Kabun, Kampar, Kampar Kiri, Kampar Kiri Hilir, Kampar Kiri Hulu, Kampar Kiri Tengah, Kampar Timur, Kampar Utara, Kandis, Kelayang, Kempas, Kepenuhan, Kepenuhan Hulu, Kerinci Kanan, Keritang, Kerumutan, Koto Gasib, Koto Kampar Hulu, Kuala Cenaku, Kuala Indragiri, Kunto Darussalam, Kuok, Langgam, Logas Tanah Darat, Lubuk Batu Jaya, Mandau, Mandau, Marpoyan Damai, Medang Kampai, Minas, Pagaran Tapah Darussalam, Pangkalan Kerinci, Pangkalan Kuras, Pangkalan Lesung, Payung Sekaki, Pendalian Iv Koto, Peranap, Perhentian Raja, Pinggir, Pinggir, Pujud, Pusako, Rakit Kulim, Rambah, Rambah Hilir, Rambah Samo, Rantau Kopar, Rengat, Rengat Barat, Reteh, Rokan Iv Koto, Rumbai, Rumbai Pesisir, Rumbio Jaya, Rupat, Rupat Utara, Sabak Auh, Salo, Siak Hulu, Siak Kecil, Siberida, Singingi, Sungai Apit, Sungai Lala, Sungai Mandau, Sungai Sembilan, Tambang, Tambusai, Tambusai Utara, Tampan, Tanah Putih, Tanah Putih Tanjung Melawan, Tandun, Tapung, Tapung Hilir, Tapung Hulu, Tebing Tinggi Barat, Tempuling, Tenayan Raya, Tualang, Ujung Batu, Ukui, Xiii Koto Kampar. 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 06 December 2025, 04:00 WIB.