These aren't your everyday fluffy cumulus clouds or storm clouds. These are gravity wave clouds -- a fascinating weather phenomenon that can form under specific conditions. Let's raise your ...

humid heat wave. That area of low pressure has been pushing across the region, bringing marine layer clouds. Although the mornings are cloudy, the skies should clear up in the afternoon.

KH waves are certainly more rare than a shelf cloud. I wrote about these wave clouds at the end of April, but they re-appeared after storms last week. Linda Gulya of Fuquay-Varina sent us this ...

When the wave crests are cold enough to condense moisture, the tops of the waves become visible clouds.

Wave clouds can also form above land but are more common over large bodies of water. (Image credit: George Rose via Getty Images) The wave cloud on the left of the image is formed by air passing ...

“Downwind of that, the air continues to oscillate up and down and that's why you see a wave of clouds known as gravity wave clouds continue out all the way into Arizona (on Monday).” Other ...

WHIDBEY ISLAND STATION, Wash. — Residents of and near Whidbey Island witnessed a weather phenomenon on Tuesday as "wave clouds" lined the horizon. Kelvin-Helmholtz clouds or fluctus clouds ...

Wave-like clouds photographed over Palmerston North.CARL GADSBY / Not-For-Syndication Rolling in the sky and breaking like waves in the sea, these clouds photographed over Palmerston North are ...