Four Thai regions face heavy rain and flash-flood risk
Monsoon conditions will bring heavy rain to four regions, with upper Andaman waves above three metres and small boats advised to remain ashore
Heavy rain is forecast in parts of northern, upper northeastern, eastern and southern Thailand on August 17, with residents warned of flash floods, forest run-off and river overflows.
The Thai Meteorological Department’s 24-hour forecast said isolated heavy rain would persist in the North, upper Northeast, East and the South’s west coast.
The conditions are being driven by a monsoon trough extending across Myanmar, upper northern Thailand and upper Laos into a low-pressure cell over upper Vietnam. A rather strong south-westerly monsoon is also prevailing over the Andaman Sea, Thailand and the Gulf of Thailand.
Winds and waves in the upper Andaman Sea will remain rather strong, with waves of two to three metres and above three metres during thunderstorms.
Vessels operating in the Andaman Sea and Gulf of Thailand should proceed with caution and avoid areas affected by thunderstorms. Small boats in the upper Andaman Sea should remain ashore.
Regional forecast from 6am August 17 to 6am August 18
North
- Thunderstorms across 60% of the region, with isolated heavy rain in Mae Hong Son, Chiang Rai, Phayao, Nan, Tak and Phetchabun
- Minimum temperature: 22–27°C
- Maximum temperature: 31–35°C
- South-westerly winds: 10–20 kilometres per hour
Northeast
- Thunderstorms across 40% of the region, with isolated heavy rain in Bueng Kan, Sakon Nakhon and Nakhon Phanom
- Minimum temperature: 24–26°C
- Maximum temperature: 33–36°C
- South-westerly winds: 10–20km/h
Central region
- Thunderstorms across 40% of the region, mainly in Nakhon Sawan, Uthai Thani, Kanchanaburi and Ratchaburi
- Minimum temperature: 23–27°C
- Maximum temperature: 34–37°C
- South-westerly winds: 10–25km/h
East
- Thunderstorms across 40% of the region, with isolated heavy rain in Chanthaburi and Trat
- Minimum temperature: 24–28°C
- Maximum temperature: 31–34°C
- South-westerly winds: 20–35km/h
- Waves around two metres and above two metres during thunderstorms
South — east coast
- Thunderstorms across 40% of the region, mainly in Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat and Songkhla
- Minimum temperature: 23–26°C
- Maximum temperature: 33–35°C
- South-westerly winds: 15–35km/h
- Waves of one to two metres, reaching around two metres offshore and rising above two metres during thunderstorms
South — west coast
- Thunderstorms across 60% of the region, with isolated heavy rain in Ranong, Trang and Satun
- Minimum temperature: 24–27°C
- Maximum temperature: 30–34°C
- From Ranong northwards: south-westerly winds of 20–40km/h, with waves of two to three metres and above three metres during thunderstorms
- From Phang Nga southwards: south-westerly winds of 15–35km/h, with waves of one to two metres and above two metres during thunderstorms
Bangkok and surrounding provinces
- Thunderstorms across 40% of the area
- Minimum temperature: 26–28°C
- Maximum temperature: 33–35°C
- South-westerly winds: 10–25km/h
