Carnival in São Paulo Brazil is a festival of pageantry and parades ahead of the contemplative season of Lent. But one of the few things that can put a damper on the celebration is bad weather. It’s the rainy season in southern Brazil, so a wet Carnival isn’t rare.

But beer brand Skol is trying to use a bit of science to keep festival-goers dry. A small jet has been ejecting water droplets into clouds near the city, inducing rainfall before the clouds are over the festival.

The campaign from GUT São Paulo makes use of a system that the São Paulo Water Company has been using successfully for a dozen years to keep the city’s reservoir full in order to water croplands. Skol began the cloud-seeding program last week and expects to continue through most of Carnival. Whether the weather will cooperate is still up in the air.