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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