564 HALL 0 5 10 no NAUTICAL MILES MAY 9, 1964 MAY 10, 1964 Fig. 38—Precipitation patterns (solid lines) and total~beta-concentra- tion patterns (dashed lines) for May 9 and May 10, 1964. greater over the northern two-thirds portion of the network crossed by the larger of the two cells, The relation of the beta-concentration cross sections to position with respect to the intensity centers of the cells, the relation between rainfall rates and total beta concentration appears to vary, not only with the stage of development of a storm but with the changesthat occur while the storm is in a certain stage, in the mature stage in particular. The profiles obtained from these few cases indicate that the minimum beta concentration occurs with the rainfall-rate maximum for cells that do not penetrate into the stratosphere (station 6 in the storm of May 9 and stations 5 and 7 in the storm of May 10). The cell that penetrated the stratosphere over station 8 in the storm of April 23

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