Over a Day, One (05:09 - 05:12)

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As promised.

These clouds are absolutely stunning.  I call them mammatus clouds (or cumulonimbus mammatus), but I don't think you can technically call them that (they're only partly similar to cumulonimbus mammatus).  Nevertheless, you can see the 3-minute evolution between the first and last image; two sections have joined.  And if you have a look at the fifth image, with the building to the right, you can see that while the rain is coming down hard, the sky is relatively calm just a short distance away, and the three "spines" of the cloud form a U with an empty hole in the middle (exactly like a U).

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