The Meteorological Department has warned that while rainfall will ease slightly early this week, heavy showers will continue in several regions due to prevailing monsoon conditions.
Officials said the North and Northeast will see scattered downpours on Monday and Tuesday, with weather patterns driven by the monsoon trough and moderate south-westerly winds sweeping across the Andaman Sea and the Gulf of Thailand.
From Wednesday through Saturday, the situation is expected to worsen, with heavy to very heavy rainfall forecast in the lower North, Central and lower Northeast regions, and particularly in the East.
The department cautioned that the strengthening south-westerly monsoon could bring flash floods and landslides to provinces including Nakhon Nayok, Prachin Buri and Trat.
Tropical Storm Tapah, currently moving across the upper South China Sea, will not have a direct impact on Thailand, forecasters added.
Bangkok and surrounding provinces will not be spared. Thunderstorms are expected to cover 60–80% of the metropolitan area each day, with heavy downpours in some districts.
In Phichit, the crisis has already struck. Severe flooding has inundated nine districts, affecting more than 1,500 households. The situation has been aggravated by surging water from the Yom and Nan rivers and runoff from nearby mountains.
Additional inflows from neighbouring Sukhothai and Phitsanulok have caused the Yom River to overflow, leaving 31 tambon and 136 villages under water.
Governor Thaniya Naipinit has declared disaster zones and authorised emergency aid funds. “We are providing urgent relief to ensure people receive support without delay,” she said.
