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Table 2 Phase velocities obtained from cloud base disturbance tracking from 0642 LT to 0647 LT (see Fig. 14 and text for more details)

From: Atmospheric Kelvin–Helmholtz billows captured by the MU radar, lidars and a fish-eye camera

 

0642–0643 LT

0643–0644 LT

0644–0645 LT

0645–0646 LT

0646–0647 LT

Phase velocity V along zonal axis (ms−1)

18.5

19.3

19.4

19.0

22.7

Phase velocity V′ along propagation direction (ms−1)

17.0

17.7

17.8

17.4

20.9