Watch as cool fog cascades down from the mountains and covers Barcelona before evaporating in the city warmth

Meteorologist Alfons Puertas took this footage from the Fabra Observatory in Barcelona. Alfons describes the scene "one video looks NW and the other to the SW. It's fresh wet air from inland falling down to the warm city that "eats" the cloud, as it is almost always when clouds fall from the mountain to Barcelona.