TMD warns of thunderstorms across 41 provinces on Oct 30
The Thai Meteorological Department warns upper Thailand and the South of thunderstorms and flash floods on October 30, 2026, urging caution against gusty winds.
- The Thai Meteorological Department (TMD) has issued a warning for thunderstorms, gusty winds, and potential flash floods across 41 provinces for October 30.
- The severe weather is caused by a combination of a low-pressure system over the Andaman Sea, easterly winds, and a high-pressure system from China.
- Upper Thailand, including Bangkok and the Eastern region, is vulnerable, while the Southern region is expected to be most affected with heavy rain and 60% thunderstorm coverage.
- Mariners in the Andaman Sea and the Gulf of Thailand are advised to exercise extreme caution and avoid navigating through stormy areas where waves may exceed two meters.
The Thai Meteorological Department (TMD) has issued a nationwide weather advisory for October 30, 2026, warning residents across 41 provinces to brace for thunderstorms, gusty winds, and potential flash floods or forest runoffs.
While rainfall in the South is expected to decrease, heavy downpours will still hit isolated areas. Meanwhile, upper Thailand—including Bangkok, its surrounding metropolitan area, and the Eastern region—remains vulnerable to severe weather conditions.
Weather Systems Driving the Advisory
According to the TMD, these conditions are driven by a low-pressure area over the Andaman Sea that is projected to move into the Bay of Bengal. This system is coupled with easterly winds prevailing over Thailand and the Gulf of Thailand, alongside a high-pressure system or cold air mass from China extending over upper Thailand and the South China Sea.
Regional Weather Breakdown
Northern Region: Ten per cent of the area will experience thunderstorms, mostly affecting Tak, Kamphaeng Phet, Phichit, and Phetchabun, with minimum temperatures of 21–25°C and maximums of 33–36°C.
Northeastern Region: Twenty per cent of the area faces thunderstorms, primarily in Bueng Kan, Nakhon Phanom, Chaiyaphum, Nakhon Ratchasima, Maha Sarakham, Roi Et, Buri Ram, Surin, Si Sa Ket, and Ubon Ratchathani, with temperatures ranging between 22–35°C.
Central Region: Twenty per cent of the area anticipates thunderstorms with gusty winds, concentrated in Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, and Samut Songkhram, with temperatures of 24–36°C.
Eastern Region: Forty per cent of the area expects thunderstorms and gusty winds, particularly in Chachoengsao, Sa Kaeo, Chonburi, Rayong, Chanthaburi, and Trat, with coastal waves under one metre and exceeding two metres during thundershowers.
Southern Region (East Coast): Sixty per cent of the area will see thunderstorms and isolated heavy rain, affecting Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, and Songkhla, with wave heights reaching up to two metres offshore.
Southern Region (West Coast): Sixty per cent of the area expects thunderstorms and heavy rain in Ranong, Phang Nga, Phuket, Krabi, and Trang, with waves reaching around two metres.
Bangkok and Vicinity: Forty per cent of the area will experience thunderstorms accompanied by gusty winds, with temperatures ranging from 25 to 35°C.
Maritime Warnings
Mariners operating in the Andaman Sea and the Gulf of Thailand are strongly advised to check route conditions and exercise extreme caution. Navigation should avoid stormy areas where wave heights exceed two metres.
