made by Eddie Graham, images taken manually 15 seconds apart
This is one of my favourite animations, there are some good things to see!
A strong storm tower, which is almost stationary near Yverdon, Switzerland
The cyclonically spreading and rotating anvil
The cooling of the air below by anvil precipitation, giving rise to new towers in distance
The west-southweserly flow of the incoming clouds from the left
But what's this wave cloud moving from the storm centre to the east? It's a storm
punch (gravity) wave cloud of course! Caused by the cumulus tower itself! Watch how it travels westwards
throughout the animation. It's just like if you
dropped a big stone in a still pond!
The Payerne radiosonde for 12z showed a little shear above 1,200m, but not much (hence the storms
didn't move a great deal). However winds were completely WSW from 1,200m upwards, above a surface calm.