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  General Situation    at 04:00 September 27, 2020  
The monsoon trough moves down to lie across the North and the Northeast to the low cell over the middle South China Sea. The southwest monsoon prevailing across the Andaman Sea, Thailand and the Gulf is strengthening. More rain is likely over the country with isolated heavy rain in the Northeast, the East and the South. From 27–29 September, the monsoon trough will move down to lie across the lower North, the Central and the Northeast while the low cell over the South China Sea will move follow the monsoon trough to the East, the lower Central and the upper Gulf. The southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf will strengthen. More rain is expected over Thailand with isolated heavy to very heavy rain. The wind and waves are in the Andaman Sea and the Gulf of Thailand will strengthen, about 2 meters height in the Andaman Sea, 1-2 meters high in the Gulf of Thailand and above 2 meters in thundershower areas.
  Bangkok Metropolis and Vicinity Forecast    From 06:00 today To 06:00 tomorrow  
Cloudy with scattered thundershowers. Minimum temperature 26-27 °C. Maximum temperature 33-36 °C. Southwesterly winds 10-25 km/hr.
More Details Issued Date September 27, 2020
  7 days Weather Forecast   September 26, 2020 - October 2, 2020  
     During 27 Sep – 2 Oct, the monsoon trough will shift to lie across the lower North, the Central and the Northeast while the low cell over the South China Sea will move follow the monsoon trough to the East, the lower Central and the upper Gulf. The southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf will strengthen. More rain is expected over Thailand with isolated heavy to very heavy rain. The wind and waves are in the Andaman Sea and the Gulf of Thailand will strengthen, about 2 meters height in the Andaman Sea, 1-2 meters height in the Gulf of Thailand and above 2 meters in thundershower areas.
     
Cautions
     During 27 Sep – 2 Oct, people in the risk areas of Thailand should beware of severe conditions. All ships of the Andaman Sea and the Gulf of Thailand should proceed with caution and keep off thundershowers.
Issued Date September 26, 2020
  7 day Weather Summary   September 18, 2020 - September 24, 2020  
The tropical storm “NOUL (2011)” over the middle South China Sea made landfall over Da Nang, central Vietnam in the morning of 18 Sep. After that, it moved through Laos before entering Thailand over Mukdahan province at 02:00 P.M. and moved through Amnat Charoen, Ubon Ratchathani, Yasothon, Roi Et, Mahasarakham provinces and downgraded into the tropical depression over Khon Kaen province at 01:00 A.M. on 19 Sep. Then it moved through Chaiyaphum, Phetchabun provinces and finally degenerated into the active low pressure cell covering Phitsanulok province in the afternoon on the same day. Moreover, the monsoon trough lay across the northern and upper northeastern parts toward the low pressure cell over the Gulf of Tonkin during the middle of the period then it moved southward to lie across the lower northern, upper central and lower northeastern parts toward the low pressure cell over the middle South China Sea. Besides, the active southwest monsoon prevailed over the Andaman Sea, Thailand and the Gulf of Thailand during the first half of the period then it weakened. These conditions caused widespread rainfall over the upper Thailand almost the period especially very heavy rainfall in several areas of the northeastern parts on 18 Sep. while the southern part experienced abundant rainfall during the beginning and the end of the period. Flash flood was reported in several areas.
Previous Issued Date September 25, 2020