Relationship between Floods in Bangladesh and Extreme Rainfall at Cherrapunji, Northeast India

Bangladesh is located in the delta of three great rivers, the Ganges, the Brahmaputra, and the Meghna, and this area has been affected frequently by severe floods in the monsoon season. Cherrapunji is located in the southern slope of the Meghalaya Plateau, which is adjacent to northeast Bangladesh. It is known as one of the highest rainfall place in the timescale of more than one month. Quasi-biweekly oscillation (QBW) is dominant in the rainfall at Cherrapunji, and heavy daily rainfalls are concentrated in the active rainfall spells (ARSs) with QBW. Severe floods in Bangladesh tend to occur in and after the ARSs. The large-scale dynamics that cause ARSs at Cherrapunji including the effect of anomalous anticyclonic circulation over western North Pacific is discussed.