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It was reported that the cloud was rolling like a horizontal twister, crossed over the city of Durban in South Africa and was followed by winds of 60kn to 70kn.
This last picture is on the opposite side of the city to the ones above - I'm not sure which way the system was moving, I suspect the first two pictures are the earlier ones.
I'm not sure I'd want to see one of these approaching whilst at sea.
Last night that happened: the water temperature is roughly 50F while the land temperatures dropped into the 20s. Air from the cold land moves towards the water. The land breezes on both sides of the Sound converged over the central Sound and rose, producing a line of clouds.
It looks similar to what Alex is describing, but the following winds are completely different. Maybe something similar followed by a strong front coming through?
Saw something that looked more like the Belgian one on our way back from Bermuda in 2010. It was black. According to BDA weather, it was a front about 500 miles long, with 50 knot winds and 20+ foot seas right over the Gulf Stream. We stayed about 20 or so miles from it by just jigging along at 2 knots for about a day, and it moved on. Heard reports of three other boats that "toughed it out" and injured members in their crew.
I saw southing similar to that here in St Augustine about 2 years ago. When it passed overhead it was like some one had flipped a switch to turn on the wind and turn off the lights. The clouds looked like they were rolling and boiling. Quite dramatic..
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