These figures are generated from MLS data averaged over latitudes 50-60N and longitudes 8W - 2E (essentially, over the UK). If I have it working right, they should be updated once per day. The graphs provide some guidance as to whether that odd-looking cloud you saw was at all likely to have been a nacreous (polar stratospheric) cloud. Temperatures below about 195K in the lower stratosphere are required for these clouds to form.
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