“Where the heavy rain does fall could see between 20-30mm of rain within 1-2 hours.”
https://www.standard.co.uk/news/london/london-weather-flood-alerts-as-heatwave-brings-thunderstorms-b946702.html?utm_medium=Social&utm_source=Twitter#Echobox=1626793085-1
Apparently, in Germany they had 148l of water per square metre in 48 hours. Insane.
https://www.theguardian.com/environment/2021/jul/16/climate-scientists-shocked-by-scale-of-floods-in-germany
If anything on that scale happened in London ...
@Oliver Schick started
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“Where the heavy rain does fall could see between 20-30mm of rain within 1-2 hours.”
https://www.standard.co.uk/news/london/london-weather-flood-alerts-as-heatwave-brings-thunderstorms-b946702.html?utm_medium=Social&utm_source=Twitter#Echobox=1626793085-1