Have you ever looked up at the clouds in the sky and wondered how they form? Understanding cloud formation is really important for studying weather patterns and making accurate forecasts. Those clouds ...

New research shows most long-lasting contrails form inside natural clouds, reshaping how airlines plan climate-friendly flight routes.

Cloud shapes arise from how air moves and mixes at different heights. When air rises, it cools. If it cools to its dew point, water vapour condenses into droplets or ice, forming a cloud.

SEATTLE — Even a clear sky contains layers of wet and dry air, that is, layers with different humidities. You can’t see these layers unless the humidity is high enough for the moisture in the layer to ...

Ever looked up at the clouds and wondered where they came from? That's exactly what atmospheric researcher Lubna Dada studies at the Paul Scherrer Institute. She is part of an international project ...

Contrails in the blue sky remind us of daily air traffic—and its impact on the climate. However, the effect of contrails on ...