This is what I came up with playing with the localized clouds feature
It seems like Mount Krakatoa!!!!
(http://my.greasy.com/host/images/19119500.jpg)
On August 27, 1883, the Indonesian volcano of Krakatoa exploded with devastating fury, reducing the island to a third of its former size and triggering a massive tsunami. More than 36,000 people were killed immediately, and the aftereffects of the eruption were felt on a global scale.