KELLOG: (continued) by gravity, and we lesve cpen whether they happen to hav & maximum density BE at 10, a tenth, a hundredth of a aidre Let's aay they are too small to cose down by gravity, bull they could be scavenged by precipitation. that Supposing now consider the kind of precipitation which can readh the highest into the atmosphere, and as kr. Fexler sentioned, thunderptoras are the obvious things that come to a mteerologist's minl when he thinks about a precipitation systes which reaches highi inte the atmosphere ~ cansos large vertical transporte of water and of air, So, the first thing that we wanted to talk about] then, waa what would happen if we had a thunderstorm reaching up into the radicactive layer. The first alide here shows this in the form of a sketch, Thie dirty brown is supposed to represent layer of radicactivity between 30,000 and 0,000 feet, a th corresponds to about the height where it would be for aw of between 20 and 30 kilotone. bearing level, Now, this is above the usgal rain-e The usual rain-bearing level is around 20/000 feet. Bot in the thunderstorm it can go up perhaps a little higher. Sone of the radar pictures taken around Boston in the summertize show columns of water - partly water - at least they give Ie good radar echo, which go up heher than 20,000 feet, and perhaps evea to 30,000 feet. I tried to visualise what would happen in the course of the development of a thunderstorm, This is the Pusulus stage, and this is the next stage, when it is called a cumulus, and you will notice that my arrows are drawn base on the report of the thunderstorm project. yo These arrows show that [a ar Ya