The rain that’s been falling from Sunday has been remarkably persistent across the northwest of Scotland. At places like Aultbea it’s been raining on and off since Saturday afternoon and non stop for the last 24 hours or so. I’ve been following it with the weather radar and it’s not too difficult in software to count the tens of thousands of the coloured pixels that represent rainfall intensity and calculate a percentage of the full radar area that they occupy. Do that every five minutes for an entire day and you end up with a chart like the one below where each colour matches the rainfall intensity. There is a minute percentage of red in the chart, but I think intensities of 32 mm/hr might be difficult to see against the white background of the graph, so I’ll have to do something about that. Despite this it’s easy to see the ebb and flow of the rain area during the last 24 hours. Hopefully in the next 24 hours we might see those percentages fall as the rainfall start to die out as the warm conveyor is closed down by colder air undercutting it from the north. I wrote this viewer ten years ago and today I spent an hour or two smartening it up even though I have very rarely used it during that time.