It wasn’t tropical storm Nanmadol to blame for the 15 inches of rain which fell in just 4 hours across southern Japan but convergence along the semi permanent baiu frontal. This front dropped south out of China bringing warm, moist air from the SW and cool, dry from NW in the wake of the TS.
A record 542mm of rain fell within 24 hours and 129.5mm within an hour in Asakura, Fukouka prefecture.
Typically heavy rain producing thunderstorms climb to between 10-12km within the atmosphere but this complex built to 18km.
Via Rob Speta
NASA
New 24-hour rainfall record
Via Rob Speta
Steve Bowen
Rare EMERGENCY ALERTS were issued for the Kyushu region of southern Japan following the exceptional rainfall.
‘Training thunderstorms erupting along the stationary front may well have been enhanced further by warm surrounding SST’s and mountain landscape (orographic).
Via Rob Speta
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