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| | General Situation | at at 16:00 | | | | | | | | Weather Advisory
No. 20 (208/2009)
Subject: Cold weather, heavy rain in the South and strong wind-wave
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| | Bangkok Metropolis and Vicinity Forecast  | From 17:00 - 17:00 | | | | | | | | Cool in the morning, minimum temperature 20-23 °C.
Northeasterly winds 20-35 km/hr.
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| | | more | Issued Date Nov 21, 2009 | |
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| | 7-day Forecast | Nov 21, 2009 - Nov 27, 2009 | | | | | | | During 21-22 Nov, the intense high pressure system from China remains over upper Thailand. An intense northeast monsoon across southern Thailand and the Gulf of Thailand as well as cooler weather, 2-4oC drops. A torrential rainfall and heavy down pour are expected in the South from Chumphon southward and the strong wind-wave in the Gulf. Thereafter during 23-27 Nov, the high pressure system over upper Thailand becomes weakening leading to an increase in temperature.
During 21-23 Nov, a westerly trough from China moves pass to the upper Northern causing widely scattered rain and decreasing temperature.
Cautions
During this period, people living along the South eastern coast should beware of heavy rain, flooding and monsoon surge. All ships in the Gulf of Thailand should proceed with caution and small boats keep ashore especially during 19-23 Nov. | | | | |
| | | | Issued date Nov 21, 2009 | |
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| | 7-day Summary | Nov 13, 2009 - Nov 19, 2009 | | | | | | | | The moderate high pressure area covered upper Thailand during the first half of the period. After that, the another active high pressure area from China extended its ridge to cover the mentioned area. In addition, the northeast monsoon which over southern part and the Gulf of Thailand strengthened at the end of the period. Under these influences, cool weather in northern and northeastern parts. Abundant rainfall was reported in southern part almost the period. | | | | |
| | | Weekly Summary | Issued date Nov 20, 2009 | |
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