Facebook post by University of Helsinki

Planes might be causing intense rainfall by flying through the clouds. “What is interesting is that the phenomenon is not caused by aircraft emissions, but the aircraft themselves. Even entirely emission-free planes, if such were in existence, would still intensify precipitation near airfields,” says associate professor Dmitri Moisseev.
Air traffic may intensify precipitation | University of Helsinki helsinki.fi

A new study indicates that planes may increase rainfall in the vicinity of airports. This that helps nowcast weather conditions at these locations.