The meteorological department (MetMalaysia), in a statement issued at 1.10pm, said the areas in Kedah expected to experience heavy rain and thunderstorms are Padang Terap, Sik, Baling, Kulim and Bandar Baharu.

In Penang, the affected areas are likely to be Seberang Perai Utara, Seberang Perai Tengah and Seberang Perai Selatan.

In Perak, similar weather conditions are likely in Kerian; Larut, Matang and Selama; Hulu Perak; Kuala Kangsar; Kinta; Kampar; and Batang Padang.

In the south, adverse weather conditions are forecast in Seremban, Port Dickson, Kuala Pilah and Rembau in Negeri Sembilan, as well as Segamat, Kluang, Mersing and Kota Tinggi in Johor.

On the east coast, MetMalaysia expects similar weather conditions in Terengganu, which involves Hulu Terengganu, Dungun and Kemaman; while in Pahang, it involves Cameron Highlands, Jerantut, Kuantan, Bera, Pekan and Rompin.

In East Malaysia, the areas likely to be hit are Kuching, Sri Aman, Betong, Sarikei, Sibu and Mukah (Tanjung Manis and Daro) in Sarawak; and Kudat in Sabah.