The detail view of the above image shows the effect of long exposures at high temperatures -- you can see the dark noise on the CCD. I only got one other picture and that isn't much good.
The trees are blurry because of the wind and the fact that both of these pictures were 8 second exposures.
Technical notes: the images were made using a Nikon Coolpix 990 and cropped down. The zoom was as wide as possible to capture as much of the sky as possible.
The weather graphs for the day are also interesting as you can see exactly
when the storm came through: