After the Crit I received a number of feeback points, some of which will be useful when I start to refine my designs. The graphic I planned to use to illustrate how tornadoes form (below) was generally seen as a bad choice. I have now decided to redraw the graphic using Illustrator, in a way that better suits the overall feel of my designs. I also need to make it look a little bit more professional.
Another criticism was that the font I used for my logo didn't go with the rest of my design as it was too detailed. I plan to explore some other fonts to try and recreate my initial idea but in a cleaner and simpler way.
Some people also felt that my colour scheme could be a little more muted, but this is something that I can change as I go along.