Monthly Weather Summary in Thailand August 2018

Transcription

1 Monthly Weather Summary in Thailand August 2018 Thailand s weather in August 2018 was dominated by the southwest monsoon which prevailed over the Andaman Sea, Thailand and the Gulf of Thailand throughout the month and strengthened during mid-month. In addition, the monsoon trough which lay across the Myanmar, upper Laos and upper Vietnam towards the low pressure cell in the Gulf of Tonkin during early and late month moved southwards to lie over the northern and upper northeastern parts for few days. Besides, during midmonth, the tropical storm BEBINCA (1816) entered Thailand at Chiang Rai province in early morning of August 18 as the tropical depression after that it moved through Chiang Mai and downgraded into the low pressure cell covering Myanmar. These caused rainfall in Thailand with slightly to moderate rain, inducing below normal rainfall in most areas. Monthly rainfall was below normal in most parts of Thailand i.e. northern part 25.9 mm (12%), northeastern part 66.5 mm (11%), eastern part 45.9 mm (15%), southern part (eastern coast) 27.1 mm (22%) and southern part (west coast) 20.0 mm (5%) except for above normal in central part 32.0 mm (18%). The average total rainfall over Thailand in this month was 13 percent lower than normal. The accumulative rainfall in this year up to August was 12 percent higher than normal. Mean temperatures in upper Thailand was close to normal while slightly above normal in southern parts August: The southwest monsoon prevailed across the Andaman Sea, Thailand and the Gulf of Thailand throughout the period and strengthened during the second half of the period. In addition, the monsoon trough lay across the northern and upper northeastern parts toward the low pressure cell in the upper South China Sea during the second half of the period. It shifted northward to lie over Myanmar, upper Laos and Vietnam toward the active low pressure cell in the upper South China Sea which later intensified into the tropical depression in the afternoon of August 10. These caused scattered to fairy widespread rain in upper Thailand almost the whole period with heavy to very heavy rainfall in some areas. The highest daily rainfall was mm at King Amphoe Khao Chamao in Rayong province on August 1 with flash flooding at Roi Et and Bung Kan provinces on August 1 and at Nong Khai province on August 2. In southern part, scattered to fairy widespread rain with heavy to very heavy rainfall in some areas was found along the east coast while western coast obtained fairy widespread rain with heavy to very heavy rainfall in some areas mainly during the middle and the end of the period. The maximum daily rainfall of mm was measured at Pato in Chumphon province on August 10 and flash flooding was reported at Surat Thani province on August 8 with flooding at Phetchaburi province on August 9 and at Ranong province on August August: The tropical depression in the upper South China Sea intensified into a tropical storm BEBINCA in the morning of August 13. It moved westward slowly into the Gulf of Tonkin in the morning of August 16. It made landfall over upper Vietnam in the morning of August 17 passing Laos and weakened into a tropical depression in the afternoon of the same day before entering Thailand at Chiang Rai province in the early morning of August 18. After that, it moved through Chiang Mai province to Myanmar and later degenerated into an active low pressure cell covering Myanmar. In addition, the active southwest monsoon prevailed over the Andaman Sea, Thailand and the Gulf of Thailand throughout the period. These caused abundant rainfall in upper Thailand especially torrential

2 rain with heavy to very heavy rainfall was found in many areas at Chiang Rai, Chiang Mai, Phayao and Nan provinces on August 17. The heaviest daily rainfall in upper Thailand was mm at Santi Suk in Nan province on August 16. Flash floods was reported at Trat province on August 14 and at Chiang Rai, Phayao and Nan provinces on August 17 and at Mae Hong Son, Chiang Mai and Lampang provinces on August 18 and at Lampang and Phayao provinces on August 18 and 19 and also at Phetchabun province on August 20. Gusty wind was reported at Samut Sakhon province on August 18. In southern part, isolated rain with heavy to very heavy rainfall in some areas was found during early and mid-period and increasing rainfall to fairly widespread rain with heavy to very heavy rainfall in some areas at the end of the period. The highest daily rainfall was mm at Mueang in Ranong province on August 12. The floods have been reported at Phetchaburi and Surat Thani provinces and at Chumphon province on August 11 and at Ranong on August August: The monsoon trough lay across Myanmar, upper Laos and upper Vietnam toward the low pressure cell in the Gulf of Tonkin almost the whole period and shifted southwards to lie over Myanmar, northern and upper northeastern parts of Thailand for few days associated with the prevailing of the moderate to rather active southwest monsoon over the Andaman Sea, Thailand and the Gulf of Thailand resulted in abundant rainfall in Thailand throughout the period especially fairy widespread rain was reported in the northern, northeastern and central parts. The maximum daily rainfall in upper Thailand was mm at King Amphoe Rattanawapi in Nong Khai province on August 25 with flash flood at Chiang Rai province on August 28, at Nakhon Nayok province on August 29 and at Phichit province on August 30 with overflowing bank at Lop Buri province on August 28. In southern part, plentiful of rain was observed along the west coast during early period with the highest daily rainfall of mm at Mueang in Ranong province on August 23 while isolated to fairly widespread rain was found nearly the whole period along the east coast. Floods remained from the previous period at Phetchaburi province and also at Satun province on August 22 and 23. Note : 1) Rainfall, temperatures and natural disasters in this report were updated up to September 6, ) BEBINCA mean Macanese Milk Pudding contributed by Macau, China. Climatological Center Meteorological Development Division Meteorological Department

3 เส นทางเด นพาย หม นเขตร อนท เคล อนเข าส ประเทศไทยเด อนส งหาคม 2561

4 Temperature ( o c) Rainfall (mm) Chiang Rai Mae Hong Son Phayao Chiang Mai Tha Wang Pha Nan Lamphun Lampang Mae Sariang Phrae Uttaradit Bhumibol Dam Tak Mae Sot Umphang Phitsanulok Lom Sak Phetchabun Wichian Buri Kamphaeng Phet Over the area % 14% Northeastern Thailand Monthly Current Report Rainfall and Accumulative Rainfall August 2018 Northern Thailand Temperature ( o c) Rainfall (mm) Nong Khai Loei Udon Thani Nakhon Phanom Sakon Nakhon Mukdahan Khon Kaen Kosum Phisai Roi Et Chaiyaphum Ubon Ratchathani Tha Tum Surin Nakhon Ratchasima Chok Chai Nang Rong Over the area % 8% NOTES : 1) Mean temperature is the average of daily dry-bulb temperature 2) "T" is trace, rainfall amount less than 0.1 mm. 3) "blank" is incomplete data. 4) Temperature and rainfall are preliminary data.

5 Monthly Current Report Rainfall and Accumulative Rainfall August 2018 Central Thailand Temperature ( o c) Rainfall (mm) Nakhon Sawan Bua Chum Lop Buri Suphan Buri Thong Pha Phum Kanchanaburi Bangkok Airport Bangkok Metropolis Over the area % 22% Eastern Thailand Temperature ( o c) Rainfall (mm) Prachin Buri Kabin Buri Aranyaprathet Chon Buri Ko Sichang Pattaya Sattahip Rayong Chanthaburi Khlong Yai Over the area % 1% NOTES : 1) Mean temperature is the average of daily dry-bulb temperature 2) "T" is trace, rainfall amount less than 0.1 mm. 3) "blank" is incomplete data. 4) Temperature and rainfall are preliminary data.

6 Monthly Current Report Rainfall and Accumulative Rainfall August 2018 Southern Thailand, east coast Temperature ( o c) Rainfall (mm) Phetchaburi Hua Hin Prachuap Khiri Khan Chumphon Surat Thani Ko Samui Nakhon Si Thammarat Songkhla Hat Yai Airport Pattani Airport Narathiwat Over the area % 15% Southern Thailand, west coast Temperature ( o c) Rainfall (mm) Ranong Takua Pa Phuket Phuket Airport Ko Lanta Trang Airport Satun Over the area % 17% NOTES : 1) Mean temperature is the average of daily dry-bulb temperature 2) "T" is trace, rainfall amount less than 0.1 mm. 3) "blank" is incomplete data. 4) Temperature and rainfall are preliminary data.

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