A severe convective storm with thunder,
shower and gust as well as hailstone in Hunan
province, China on April 8, 2008 was
investigated using the remote sensing data such
as FY-2C satellite, Doppler radar and automatic
surface weather network. The results show that
1. The previous warmer weather provided
abundant unstable energy, and the vertical wind
shear, thermo-dynamic factors are favorable for
severe convection. 2. The mesoscale torrential
rain clouds triggered by the tail of front-cyclone
clouds caused the event. 3. The phenomenon that
the thunder storm clouds were triggered by
frontal cyclone clouds was revealed clearly by
FY-2C satellite image. Cloud-Derived Wind
image indicated the strong divergence at the
high level. 4. The PPIs manifest as the isolated
massive echoes, and the intense echo cores of
storms is higher than 65dBz at the 3-6km
altitude on reflectivity vertical section, the echo
higher than 50dBz located at 9km high-level and
the temperature is approximately - 30°C, the
echo top height is higher than 12km. the PPIs at
different levels show that the character of
"three-body scattering spike" at 16:18, 16:36
and 16:54 respectively, namely typical character
of hail echo. 5. For velocity, at the low and middle altitude, there were the cyclonic
convergence and divergence at the high altitude.
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