This time-lapse sequence shows clouds moving north-east as the weather fronts that preceded Storm Dennis swept in from the North Atlantic. At the end of the middle sequence you can see the higher clouds are moving in a different direction to the lower clouds, veering off to the east a little.
Righty Tighty
Because of the Coriolis Effect, in the Northern Hemisphere moving masses of air are deflected to the right (the same direction as tightening a screw). I can remember standing on a recreation ground roundabout and feeling that pull. If you stand with the wind behind you, the high pressure area is always to your right.