Geoscience Reference
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Fig. 10. 6-hourly multiple-Doppler analysis of radar data over France starting at 12 UTC on 6
Sept 2010. Left panel shows reflectivity (dBZ) superimposed on horizontal wind vector at 2.5
km AMSL. Righ panel shows vertical velocity (m/s) and horizontal wind vectors at 6 km
AMSL. Vertical velocity values (m/s): dark green (w<-1) green (-1≤w<1), yellow (1≤w<2),
orange (w≥2). One every sixth vector is plotted.
the Cevennes area. The convective activity in this region significantly intensified in the
following 12 hours (Fig. 10e and g), as shown by radar reflectivity values increasing up to 55
dBZ. During this period, the MCS also became more organized and developed a well-
defined stratiform region. At 12 UTC, 7 September, the MCS was absorbed by the frontal
