Cloud-watchers can talk all about the interesting shapes they've noticed over the years. They may have been gazing out the car window during a road trip, or tanning on the beach, or on a morning walk.

Owen told me that the picture was simply of a sunset over Hawaiian ocean waters. Yep, that's it. It is not even volcanic activity as some have also reported.

The sky had an ocean wave look to it for a time yesterday. These rare clouds were spotted over southern Michigan Wednesday evening. The clouds are called Kelvin Helmholtz clouds, named after two ...

The clouds are called Kelvin-Helmholtz clouds and are unusual to see in Florida. ... The faster wind above actually pushes over the tops of the clouds and creates the ocean wave-like appearance.

The impact of the recent Saharan dust cloud was likely most severe in the Caribbean. Ordinarily, the concentration of PM10 is 10 to 20 micrograms per cubic meter of air, mostly due to sea salt.