Fog all day, but not on The South Downs
This foggy view isn’t unusual over Midhurst and the Rother Valley. It’s a temperature inversion in the atmosphere. As air rises it normally gets colder, but if the temperature is only a couple of °C and there’s no breeze and clear skies, the reverse can happen and the air nearest to the ground gets stuck there – trapped under a layer of warmer air above it.