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A beach on the Costa Blanca was smothered by a thick grey cloud on Tuesday, causing concern among tourists and residents. Footage of the phenomenon went viral in just a few hours as viewers speculated about the cause. In the video, the dense cloud can be seen sweeping over a beach in Alicante on the Spanish coast on a sunny day. While it may look like think smoke, several viewers suggested the cloud was a type of fog common in the area of Valencia, occurring when cold sea air mixes with hot air from the interior. Travel