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The colors relates to the number of lightning strikes in the last 30 mins.
Also an overlay plot of last main synoptic (:00) hour METAR observed thunderstorms and cumulonimbus.

How to understand the image date stamp (example):

Sferics plot/001023/1400

001023/1400: year=2000; month=10 (october); day=23; 1400=14:00 GMT