——— KELLGs (continued) The next case we thought oupht to be considered to sstisfy the people who might says "What would happen if we had a thubderstora immediately — not an hour or two later, as suggested befhre — but ocourring right at the tine of the explosion?® I tried visualize what would happen here if we were to consider fhat the borb went off on a thundery afternoon, in which we have gonvectively unetable conditions, J say now be saying sousthing whicl may not be in agreement with everybody here who has studied thungerstorss, Let's say tentatively that we could have a condition whege only a small displacement vertically in the stem could set off storm at this point. I should say here, how, that this in the stem that the thunderstorm would start, because thunderje definitely tie tine aequence for the development of a thunderstorm is in the lorder of one-half heur to sore then an hour, whereas, this mushroga cloud goes Sooming on up and reaches its ceiling at about fivelor minutes, six Kow, if this thunderstora were to develop hareg we would have essentially the same story that we had before, the a difference now being that the debris micht be incorpa: upper part of the thunderstore system iteslf. Since this 4 in the is well above the minus 20° iecthern, we would expect this to be noth but fee particles and, as I understand the picture which been gathered frou radar etudies and flights through thandersthras, we do not expect this material to fall down to the ground, Yecause the ice particlea in the upper part of the thunderstorm grow slowly, fo then we can say that in these two cases of very thnnderstorzs we do not get rainont cf radioactive material by the thumerstors Y