Spiraling clouds around a what looked like a dark hole with soundless lightning.A very unusual fog for 17:30pm, as I was driving back from work. It was very dense, and Nassau is almost never in any fog, and the season is not appropriate for that at all. Interestingly the fog cleared and to the right in the sky the clouds had formed what looked like a spiraling circle around a black hole in the middle... And very strangely sparks of lightning with no sound! At least 10 other drivers must have seen it. Some people walked out of their cars! I thought the end of the world had come! But it strangely, what looked like a hole began to close within the next few minutes. I was going to kill myself for not keeping my camera on me at all times. And it is a 10 megapixel one at that! And then it all vanished; everything cleared. No fog... Gone as it had come. Some of the drivers stared at each other for a good while after. There is no way I am sleeping tonight. Witnesses could be a lot more than 10, but at least 10 around me!