Very heavy rain is possible in parts of Chiang Rai, Phayao, Nan, Uttaradit, Phitsanulok and Phetchabun. Very heavy rain is possible in areas of Loei, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon and Nakhon Phanom. EastThunderstorms are expected across 70% of the region, with heavy rain in parts of Nakhon Nayok, Prachin Buri and Rayong, and very heavy rain possible in Chanthaburi and Trat. South West CoastThunderstorms are expected over 60% of the region, with heavy rain in parts of Ranong and Phang Nga. Bangkok and VicinityThunderstorms are forecast across 70% of the capital and surrounding provinces, with heavy rain in some areas.