- Climate change is ‘supercharging’ storm systems, leading to more rainfall that creates worse flooding, says hydrologist Hannah Cloke - Climate change ‘may also make storms slower moving, increasing rainfall accumulation and flooding,’ says John Marsham, a professor of atmospheric science - ‘Rain will be more concentrated in events such as flash floods in autumn. Extreme weather events will become more intense and more frequent,’ says scientist Marilena Oltmanns ISTANBUL   Spain’s recent