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Weather Advisory
Subject: Storm “KOTO”
And cool to cold in Thailand
(Effect until 30 November – 1 December 2025)
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At 4.00 a.m. LST (30 November 2025), severe tropical storm “KOTO” over the middle South China Sea or at latitude 13.8 degrees north and longitude 112.4 degrees east with maximum sustained winds about 93 km/hr. This storm is moving north-northeast slowly. This storm is expected to move near the coast of Vietnam while the high-pressure system covers Vietnam and the upper South China Sea. This storm will decline rapidly and not move to Thailand.
The rather strong high-pressure system from China which covers upper Thailand, the upper South is weakening with increase in temperature and morning fog. Morning cool to cold is forecast in the upper country and the upper South regions. On mountains top of the North and the Northeast, cold to very cold are forecast. The minimum temperature of the North mountaintops is in range of 5-10 °C while the Northeast ranges by 7-11 °C. People in the upper country and the upper South should keep healthy due to the cool to cold weather and beware of fire due to dry air.
The moderate wind and wave in the Gulf and the Andaman Sea offshore are expected 1-2 meters high and above 2 meters high in thundershowers. All ships should proceed with caution and keep off thundershowers.
This advisory is in effect on 30 November 2025, at 5.00 a.m.
This next issue will be on 30 November 2025, at 5.00 p.m.
(Signed) Sugunyanee Yavinchan
(Miss Sugunyanee Yavinchan)
Director-General
Thai Meteorological Department