https://www.theguardian.com/uk-news/2021/sep/29/do-i-need-a-brolly-google-uses-ai-to-try-to-improve-two-hour-rain-forecasts > ‘Precipitation nowcasting’ is attempt to predict weather more accurately in short term > Weather forecasts are notoriously bad at predicting the chances of impending rain – as anyone who has been drenched after leaving the house without an umbrella can testify.