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Thailand Weather
  General Situation    at 16:00 November 20, 2018  
The active low-pressure cell over the Gulf of Thailand covers the middle South by today (20 November) and is expected to move pass through the Andaman Sea by 21 November. In addition, the stronger northeasterly wind across the Gulf of Thailand bring about isolated heavy to very heavy rain in the areas. People should beware of severe conditions. The moderate wind waves are likely about 2 meters high in the Gulf and the Andaman Sea. All ships should proceed with caution lasting 22 November. A reduction of rainfalls is forecast for the North, the Northeast, the Central and the East regions due to the moderate high-pressure system over the North, the upper Northeast and the South China Sea. During 22-25 November, another high pressure system will extend to the upper half of the country and the South China Sea. Isolated thundershowers with a cool spell and strong winds will be likely over the areas. A decrease in temperature by 2-4 °C will be forecast for the North and the Northeast while in the Central Plains including Bangkok and its vicinity, and the East the temperatures decrease by 1-3 °C. In addition, the northeast monsoon will intensify with outbreaks of continuous rainfall over the South and moderate wind waves of both seas.
  Bangkok Metropolis and Vicinity Forecast    From 17:00 today To 17:00 tomorrow  
Cloudy with isolated thundershowers. Minimum temperature 24-25 °C. Maximum temperature 33-35 °C. Northeasterly winds 10-30 km/hr.
More Details Issued Date November 20, 2018
  7 days Weather Forecast   November 20, 2018 - November 26, 2018  
     During 20-21 Nov, The moderate high pressure from China covers Vietnam and the South China Sea, while the low pressure cell before moving to the Gulf of Thailand and the lower South. More rain and isolated heavy rain are likely over the areas. During 22-26 Nov, another moderate high pressure area form China will extend to the upper North, the Northeast and the South China Sea. Isolated thundershowers in the first after that temperature drop 1-3 °C. The tropical Depression eastward of Philippines. Forecast, this storm will develop to tropical storm and will move to the middle South China Sea during 21-23 Nov. Expected, this storm will make landfall the southern part of Vietnam during 24-26 Nov, and it will downgrade to tropical depression, low pressure cell and dissipate.
     
Cautions
     During 20-21 Nov, farmers in upper Thailand should prepare for crops damaged with possible rainfall. People in the South should beware of severe conditions. During 20-22 Nov, All ships over the Gulf should proceed with cautions.
Issued Date November 20, 2018
  7 day Weather Summary   November 12, 2018 - November 18, 2018  
The weak high pressure area covered upper northern and upper northeastern parts of Thailand and the South China Sea during the first half of the week then another moderate high pressure area from China extended its ridge to cover upper Vietnam and South China Sea accompanied with the southeasterly wind prevailed over upper Thailand throughout the week. In southern part, the northeast monsoon which prevailed over the Gulf of Thailand and southern part weakened on the first day of the week. In addition, the low pressure cell which covered the Borneo moved to cover Malaysia then moving to Malacca Strait during the middle of the week associated with easterly wind prevailed over the southern part and the Gulf of Thailand during the second half of the week. Moreover, the tropical depression which covered the middle of the South China Sea intensified into the tropical storm “TORAJI (1827)” in the morning of 18 Nov and slowly moved southwestward and made landfall over southern Vietnam before weakened into the tropical depression in the afternoon of the same day. These conditions caused increasing in temperature over upper Thailand and unusual rainfall occurred in some areas while rainfall occurred almost the whole week with heavy to very heavy rainfall in some areas of southern part.
Previous Issued Date November 19, 2018