A flash flood causes by torrential rain hit downtown Mae Sai in Chiang Rai Province today, washing through business as well as causing Sai River to break its lower banks.
According to Thai language reports, the rain struck just after 1 p.m. today Sept. 18 by 1:20 p.m. water was flowing through down Phahonyathin Road (Highway 1) inundating shops.
Pictures from the scene show the market at the Thai/Myanmar border under around 20 centimeters of water while riverside restaurants had similar levels.
The extent of the damage is not known at this time but the flood waters are reported to have fairly rapidly receded.
Typhoon Mangkhut was downgraded to a low-pressure system as it crossed over Kunming in China overnight but its remnants are still affecting a broad area around it. A weather warning for heavy rain, storms, possible flash flooding and mudslides remains in place through Thursday for northern Thailand.