The Thai Meteorological Department warns of heavy to very heavy rain in 43 provinces, with Bangkok, its vicinity, the central region and the east worst hit (about 80% of those areas). Flash floods, flash torrents and landslides are possible, especially near hill slopes and low-lying areas. Small boats in the upper Gulf of Thailand should stay ashore until 27 Sep. For your business: plan deliveries around flooded low-lying roads, move stock off ground floors, check drainage and generators, and warn staff who travel through known flood spots. Sea waves reach 2-3 m in the upper Gulf and east coast.