![]() Wind flowing over the Rocky Mountains, for example, can create gravity waves that are felt as turbulence on an airplane.Ĭlouds can form on the cooled crests of these waves when enough moisture is present in the atmosphere, as they did in this case. Gravity causes the air to fall back down, and it begins to oscillate, creating a ripple effect. ![]() They form when air is forced upward by hills or mountains into a layer of stable air in the atmosphere. The gravity waves seen in this video are known as terrain-induced waves. Just like waves form in the ocean or a lake when water is disturbed, waves also form in the atmosphere when air is disturbed. Gravity waves are similar to what happens when you drop a stone into a calm pond, but they roll through the air and cloud tops instead of water. ![]() On April 3, 2021, NOAA’s GOES-16 and NOAA-20 satellites viewed gravity waves rippling over Western Pennsylvania.
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