A band of quick moving Kelvin-Helmholtz clouds passed by East Kentucky during the early part of the afternoon, moving over Lee, Scott, and Wise counties in Virginia. These kind of clouds are formed as a result of separate layers of air moving past each other at different speeds. They are named after Hermann von Helmholtz and Lord Kelvin (for who the Kelvin scale for measuring temperatures is named). Wave type cloud formations are relatively rare and quite a sight. For a time you could even see them on the WFO Jackson office webcam located here: http://www.crh.noaa.gov/jkl/?n=jklwebcam and also on the satellite images from over the tri-state area.