Jet streams.

For the first time in a few months we've had a cloudy day, up until a few minutes ago when the blue sky has broken through above La Roque St Christophe to reveal this criss cross pattern left by the airliners heading north, south east and west.
Consequently with the clouds and breeze the temperature has dropped to low twenties but according to the forecast it's heading above the thirty degrees again by Saturday so our new arrivals on Saturday have nothing to fear!