The worst flooding in Saigon comes in late October to December. Black clouds roll in from the direction of Vung Tau, pushing up river like a gathering horde; the once airy sky turns heavy and dark, auguring unrelenting rains to come. In minutes the streets are overwhelmed. Motorbikes are caught mid journey. Drivers wait it out under cafe awnings, watching the streets turn to streams, streams to rivers, rivers to oceans of disturbed waves, all in a Saigon minute.