More on that rain in the southwest of England

I have been downloading radar data with an application that I wrote for the last ten years. It downloads 5 minute tiled images and stitches them together into one composite image and puts them into an image grid. I never thought that the Met Office would continue to supply the tiles as they have done from the Datapoint service for so long but am gratefully that they have. I decided to add an extra viewer to the app in the last few days something I should have done a long time ago, it displays in a grid hourly accumulations rather than just 5 minute intensities animations. I’m still not happy with the colour scale – I can never seem to find the right colours – but I believe it gives a slightly different perspective into the rainfall data you get from intensities alone. Apologies for the large size of the image grid below, I’ve stepped up the quality so that you can clearly read the legend.

If anything the areal rainfall extent and rainfall intensities this afternoon have pepped up, the story in the forecasts yesterday was by afternoon this rain band would have fragmented into showers. I have read that the GFS model did pretty well in its forecast of the rainfall from this system, that might be true of the GFS model but not of the UKMO model, not that we’re ever allowed to see it!

4 thoughts on “More on that rain in the southwest of England”

  1. Excellent post. Have you considered finding the maximum accumulation in the period of interest, scaling the colour gradient appropriately between 0 and max, and then keeping that same colour gradient all the way through? Rainfall colour scales are awkward because the range of possibilities is enormous depending on event and also duration!

    1. I could try that but it’s just getting the time to do it. I really want to update and expand the area I plot temperature anomalies i.e. globally. To do that in detail I need daily LTA for a lot of stations. I have the data I just need to process it. So I have to write an app to produce the LTAs in another program. It all takes time and as I get older the brain is that but slower! On top of that the grass needs mowing if it ever stops raining!

  2. I know what you mean, there’s so much data and so little time. By the way, did you mean 15 minute tiled images rather than 5? I’ve only ever been able to find 15 minute data on Data Point… Met Office public offering abysmal as always.

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