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TIME, EST
Fig. 7—Resulis of rainwater analyses and rainfall-rate data for
Sept. 30, 1961.
September 30 rain samples. In the May 19 rain, the pollens appear to
have been progressively washed out except for the upward tendencies
of samples 4P and 6P, The radioactive materials, on the other hand,
show peculiar tendencies in both cases, More detailed discussion of
these peculiarities is presented later, but it should be noted here that
there is a strong likelihood that tropospheric (intermediate) radioactive debris was present in both cases, Necessarily, a low frequency
of sampling is associated with low-intensity rainfall; however, in both
of these situations, samples were taken continuously throughout the
rains,
Summary
The two classes of convective rain-producing situations that we
have distinguished have a number of contrasting characteristics. Al-
though the sample size is extremely small (because ofthis, it will
probably be necessary to revise the classification criteria as more
data become available), the distinctive characteristics are brought
together in Table l.