Weather phenomenon - SailNet Community
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post #1 of 14 Old 12-06-2013 Thread Starter
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Weather phenomenon

Has anyone seen this before?



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.


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Last edited by Omatako; 12-06-2013 at 01:02 PM.
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post #2 of 14 Old 12-06-2013
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Re: Weather phenomenon

I would only love to think that its mandelas spirit hovering over his country...

if this is present
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post #3 of 14 Old 12-06-2013
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Re: Weather phenomenon

Talk about a well-defined frontal boundary!

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post #4 of 14 Old 12-06-2013
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Re: Weather phenomenon

That looks more like a cloud created over a body of water by a land breeze. There is an explanation here:
Cliff Mass Weather Blog: Cold Facts and Coastal/Oregon Snow

Quote:
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.

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post #5 of 14 Old 12-06-2013
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Re: Weather phenomenon

Arcus (roll cloud) caused by cold air off the ocean dropping and warmer land air rising

I hear they're pretty common down under

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post #6 of 14 Old 12-06-2013
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Re: Weather phenomenon

That happened this summer over the Maryland coast. Pretty dramatic.

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post #7 of 14 Old 12-06-2013
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Re: Weather phenomenon

If I ever see that, my sails are coming down and I'm clipping in.

What direction does the wind usually blow relative to the cloud line?
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post #8 of 14 Old 12-06-2013
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Re: Weather phenomenon

Quote:
Originally Posted by TakeFive View Post

What direction does the wind usually blow relative to the cloud line?
I think it would blow offshore or towards the cloud

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post #9 of 14 Old 12-06-2013
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Re: Weather phenomenon

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?
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post #10 of 14 Old 12-06-2013
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Re: Weather phenomenon



Reef.
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