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It warned people in risky areas to beware of rain water accumulation that may cause overflows and flash floods.
The department also advised all ships to proceed with caution and keep away from areas with thundershowers as waves in the Andaman Sea and the Gulf of Thailand are about 1-2 metres high and over 2 metres during heavy rain.
Here’s the weather forecast for the next 24 hours:
Bangkok and surrounding areas: Thundershowers in 80 per cent of the area with isolated heavy rains; temperature lows of 24-25 degrees, highs of 32-34 degrees Celsius.
North: Thundershowers in 70 per cent of the area with isolated heavy rains; temperature lows of 22-24 degrees and highs of 31-34 degrees Celsius.
Northeast: Thundershowers in 70 per cent of the area with isolated heavy rains; temperature lows of 23-25 degrees and highs of 30-33 degrees Celsius.
Central: Thundershowers in 80 per cent of the area with isolated heavy rains; temperature lows of 23-25 degrees, highs of 30-34 degrees Celsius.
East: Thundershowers in 80 per cent of the area with isolated heavy rains; temperature lows of 23-25 degrees, highs of 30-33 degrees Celsius; waves 2 metres high and over 2 metres during thundershowers.
South (east coast): Thundershowers in 60 per cent of the area; temperature lows of 23-24 degrees, highs of 31-34 degrees Celsius; waves 1-2 metres high and 2 metres during thundershowers.
South (west coast): Thundershowers in 80 per cent of the area with isolated heavy rains; temperature lows of 19-25 degrees, highs of 27-32 degrees Celsius; waves 1-2 metres high and over 2 metres during thundershowers.