Liam, go to http://www.yr.no/satellitt/europa_animasjon.html
Put the slider on 21:00 Hrs. On the far left edge of the image out in the atlantic (about half way down) is the strong bump of cloud which is tommorows next system. Now run it to the current time and watch the speed of that foreward edge. I have never seen anything even close to the incoming speed that this is showing... 500+ miles in 3 - 4 hrs??