You're right - on doing some more research it seems there are now 15 weather radars across the UK. Perhaps this straight edge view is a hangover from earlier (presumably lower resolution) systems.
This image shows the shape of radar data that I remember from school, which is a sector of a circle which covers the UK, I can only presume from a radar system to the south. Or it could be that the shape is something to do with the curvature of the earth. I wish I listened more during geography lessons now.
I'm struggling to find answers - only more questions! Of course, it could be nothing to do with radar at all... I'm out of ideas!
Last edited by neonemesis on 5 September 2018 11:37am - 2 times in total