540
HALL
o-—
N
NSSL
2
>
°
4
e
:
0
WSR-57 RADAR
5
10
Lt
3
NAUTICAL MILES
6
e
4
6 ;
pep
Fig. 8—Storm position with radar-echo-intensity contours
(db) for
1709 CST on Apr. 23, 1964.
Table 2— TROPOPAUSE HEIGHTS
OVER CENTRAL OKLAHOMA
Date
April 17
April 23
May 9
May 10
sity.
Time,
CST
Tropopause
0600
1800
1800
1800
height, ft
41,197
40,672
41,328
43,296
There was little apparent peripheral evaporation at station 8
since, as can be noted from Fig. 9, the rainfall rate during the final
sample collection was of moderate intensity.
With the exception of station 5, at which two samples werecollected, station 8 was the only one at which multiple samples were
taken, Between-station comparisons from Table 1, radiochemicalanalysis results, and the precipitation and total-beta-activity patterns
of Fig. 12 show that activity maximums occurred at stations 2 and 7,
where the particulate beta concentrations were considerably higher
than those at the other stations. The rainfall at station 2 was of the
weak peripheral type, but 0.26 in. fell at station 7, which apparently
had a collector malfunction since only one collecting jug was filled to
overflowing. The 0.26 in, of rainfall should have yielded more than one
Sample. This, however, does not account for the high particulate beta
concentrations. An overfilling malfunction also occurred at station 9,