What does it have to do with the La Nina phenomenon and will it lead to more flooding? SINGAPORE: Singapore's government issued flood risk alerts on Monday (Oct 14) as the inter-monsoon period brought heavy rains and lightning. Throughout the rest of Southeast Asia, weather forecasters are predicting similarly wetter conditions for the next two months at least, possibly signalling a shift to the start of the La Nina phenomenon. What is La Nina and how does it lead to heavier rain? It's a