| Cumulonimbus
        evolution: 20 minute sequence -  Sadly I didn't note the exact date.
        However I remember storms forecast for Central England
        but high pressure building from the west. These were
        taken during the morning before the pressure rise killed
        off convective activity over the Welsh mountains. | |
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|  Rapid upward building commences......... | |
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|  Continues to build with striated anvil evident (R)..... | |
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 The
        shower produced heavy precipitation but did not turn
        thundery, at least while I was there. I left shortly
        afterwards as developments became totally obscured by a
        second cumulonimbus coming in from the SW. Good while it
        lasted though! | |