Since rising air causes clouds to form (the risen air eventually cools to the temperature of its elevated surroundings, and any water vapour it contains thus condenses), the result would be more rain than would fall in the absence of the artificial aerosols.

ECONOMIST: Saturday-night showers

Thanks to stylized dialogue and obviously artificial settings, viewers are always at some remove from the action whether it be on a nearly deserted rain-soaked street at midnight or in a sparsely furnished, smoke-filled room lighted only by a bare bulb.

WSJ: Black and White and Noir | Dark Crimes: Film Noir Thrillers | By David Mermelstein