Rainfall warnings issued for UK as April dry spell comes to abrupt end / Rainfall warnings issued for Metro Vancouver, parts of South Coast / Low-pressure system prompts rainfall warnings for Toronto and other parts of Ontario / Study finds timing of rainfall crucial for flood prediction / Rainfall warnings issued for some areas in northeastern B.C. / Fresh weather warnings for Spain: Several regions are placed on alert for rain and storms / Forecasters warn of heavy rain for some overnight / The short-term rain forecast system is broken. Can AI do a better job of predicting deadly floods?