A field of altocumulus undulatus spreads across the sky. The regular pattern in these mid-level clouds reveals an atmospheric wave traveling along the boundary between two air masses, one below the cloud level and another above it.
Altocumulus undulatus (DI00869), Photo by Caspar Ammann
Caspar Amman
University Corporation for Atmospheric Research (UCAR)
image
Clouds
NCAR/UCAR Image and Multimedia Gallery
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DI00869
http://n2t.net/ark:/85065/d7v9863v
