The high pressure covers the upper Thailand with less rain while the South gets more rain. Affected areas are as followings:
South: Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat and Songkhla.
The final advisory is effect on 23 March 2018, at 5.00 a.m.
(Signed) Wanchai Sakudomchai
(Mr. Wanchai Sakudomchai)
Thai Meteorological Department
Article source: http://www.tmd.go.th/en/warningwindow.php?wID=6906