A marked increase in rainfall across Thailand, with some very heavy downpours in the southwest and rough conditions in the Andaman Sea, have prompted meteorologists to warn of potential flash floods and to advise small vessels to remain ashore.
The Meteorological Department issued the alert early today, forecasting a substantial increase in precipitation over the next 24 hours.
This surge in weather activity is attributed to the combination of a strong southwestern monsoon, over the Andaman Sea, the Thai mainland and the Gulf, and a monsoon trough traversing northern Laos and heading towards a low-pressure system over the South China Sea, amplifying the unstable conditions.
A 70% chance of rain is forecast for the southwest coast, with specific warnings of heavy to very heavy rain in Ranong, Phang Nga, Phuket and Krabi. Southeastern coastal areas face a 60% chance of rain, with severe weather possible.
In the northern, northeastern, central and eastern regions, a 60% chance of rain is forecast. Provinces likely to be affected by heavy downpours include Mae Hong Son, Chiang Mai, Nong Khai, Sakhon Nakhon and several areas in and around the Greater Bangkok area.
Sea conditions are extremely hazardous.
Waves in the northern Andaman Sea, north of Phuket, are reaching heights of 2-3 metres and can exceed 3 metres during thunderstorms.
Further south in the Andaman, and parts of the Gulf of Thailand, sea conditions are also rough.
All mariners are urged to navigate with caution and avoid stormy areas. Small boats in the northern Andaman should not to set out to sea.
