Majesty and threat – a majestic cumulonimbus with anvil seen beyond wind turbines at Burra, South Africa, by photographer Helen Simpson for The April photorgaph in the Australian Bureau of Meteorology calender 2013

Majesty and threat – a majestic cumulonimbus with anvil seen beyond wind turbines at Burra, South Africa, by photographer Helen Simpson for The April photorgaph in the Australian Bureau of Meteorology calender 2013

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