Monthly Weather Summary
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January 2562
In January 2019, the high pressure area from China occasionally extended its ridge to cover upper Thailand and the South China Sea caused cool weather in the whole areas of the northern and northeastern parts with cold weather in the upper portion. For the other regions, there were cool weather in several areas during early month when the high pressure areas was active as well as during late month that high pressure areas continuously covered upper Thailand. However, the average temperature during this month was above 1980-2010 normal in all regions with mean monthly temperature of 1.3 oC higher than normal. For rainfall, there was scanty rainfall in upper Thailand except for during 7-9 January that the westerly trough moved through the northern region inducing unseasonably rainfall at that time. In southern part, due to the effects of the northeast monsoon prevailing over the Gulf of Thailand and southern part, intermittent rainfall was observed throughout the month especially during January 3-5 that experienced widespread rain due to the influence of the tropical storm “Pabuk (1901)” which was the first tropical storm entering Thailand this year. It made landfall in southern part at Pak Phanang, Nakhon Si Thammarat province on January 4 and then moved through Krabi province before downgraded into tropical depression covering Phang-nga province on the following day. This storm induced abundant rainfall with successive of heavy to very heavy rainfall inducing flash flooding in many areas in southern part and strong wind with storm surge occurred in some places during January 3-5. The monthly rainfall were higher than normal in the northern part 23.5 mm (511%), southern part (east coast) 113.0 mm (189%) and southern part (west coast) 46.9 mm (178%) while it was lower than normal in the northeastern part 4.8 mm (100%), central part 5.0 mm (75%) and eastern part 9.9 mm (61%). The average total rainfall over Thailand in this month was 24.4 mm (149%) higher than normal.
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Issued Date February 13, 2019