… Because a Tropical Depression has moved in from the South China Sea
Normally the rain we get in Bangkok is convectional (meaning that it is generated from the heat of the sun through the day). But over the last couple of days there has been a tropical depression that has made landfall over middle Vietnam passing Laos PDR and Ubon Ratchathani, Thailand and downgraded to the low pressure cell through the Northeast. At 4.00 a.m. on 20 September, the low pressure covers provinces of Saraburi, Lop Buri and Nakhon Nayok.
Torrential rain is likely, as well as isolated gust much of the following provinces, namely, Phitsanulok, Kamphaeng Phet, Nakhon Ratchasima, Nakhon Nayok, Prachin Buri, Chachoengsao, Chon Buri, Rayong, Chanthaburi, Trat, Nakhon Sawan, Uthai Thani, Chai Nat, Sing Buri, Saraburi,
Lop Buri, Ang Thong, Suphan Buri and Phra Nakhon Si Ayutthaya, as well as Bangkok and Vicinity.
Another storm “USAGI” east of the Philippines, tracks west-northwest to the upper part of the country. It is forecast to move to the South China Sea. So this might not be the worst of it.