More tropical storms are forecast during the coming Songkran festival, particularly in upper Thailand, where strong winds, thunderstorms and hail are expected between April 12 and 14.

Residents in these areas are advised to prepare for storms, the Meteorological Department said on Tuesday.

Starting today through Friday, a low-pressure system will bring extremely hot and humid conditions across the upper part of the country, with thunderstorms expected in some regions.

Between April 12 and 14, a high-pressure system from China is expected to move into the Northeast and the South China Sea, which could cause scorching weather and summer storms.

Residents in the South are warned of westerly and northwesterly winds affecting the Andaman Sea and southern regions from April 9-14. These winds are anticipated to generate sea waves of up to 1 metre in the Andaman Sea and between 1 and 2 metres in the Gulf of Thailand.

During the storm period from April 12-14, residents in upper Thailand are urged to avoid unnecessary travel in affected areas.