994
HALL
mum in the beta concentration was found in the sample which was taken
just after the echo-intensity maximum at the station had passed and
the cell was dissipating. The final collection was from weak peripheral
rainfall.
:
A similar occurrence regarding cell dissipation existed between
stations 8 and 9 as had occurred between stations 6 and 7, i.e., a direct
relation between the beta concentration and the rainfall rate. Minor
development occurred near station 9, resulting in an inverse relation
between rainfall rate and beta concentration as shown in Fig. 19.
At station 10 the initial rainfall rate was moderate, and the
absolute maximum of beta concentration at this station was found in the
first sample taken, From Fig, 27 it can be seen that general stratification took place in the vicinity of station 10 after about 2121 CST, It was
after this time that, as seen in Fig. 20, the rainfall-rate maximum
occurred, accompanied by a peak in the beta concentration. A similar
occurrence took place at station 5 (see Fig, 15) during cell dissipation
in that area,
ANALYSIS OF STORM OF MAY 10
The synoptic situation had changed little from the previous day,
The incipient wave on the quasi-stationary front over the Texas—New
Mexico border (Fig. 13) had developed. Figure 28 showsthe related
cyclone better developed. Winds over the network were southeasterly
at the surface veering to southwesterly up to the tropopause, Convective activity occurred over the state during the morning and after16
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Fig. 28—Surface synoptic chart for 0000Z of May 11, 1964.