Thai downpours shift north-westwards after Bangkok declared a disaster zone

Capital city submerged in waist-high flood water, while elsewhere Hurricane Nolo threatens Hawaii’s Big Island

Bangkok was declared a disaster zone by its city officials towards the end of last week, after streets in Thailand’s capital city were submerged in up to waist-high flood water. The flooding stemmed from an active cell of low pressure across central Thailand that brought continuous heavy rainfall and thunderstorms to Bangkok and surrounding regions.

The heavy rain began early on Thursday when the weak area of low pressure travelled north-westwards up the gulf of Thailand before then sitting over central Thailand by Friday morning. For most of the following two days this low pressure remained roughly in situ, which allowed unrelenting downpours over Bangkok and nearby areas. One weather station near Prachin Buri, just north-east of the capital, recorded 213.5mm within a 24-hour period between Friday and Saturday evening local time – for comparison, London receives an average 585mm a year). Fortunately, the centre of the low-pressure cell shifted north-westwards on Sunday and brought an end to the torrential rainfall.