qa . G5 The radar video return from the ROMEO cloud was ten to fifteen miles in diameter. It was persistent for about thirty minutes and then began to dissipate. By H plus forty-five minutes the cloud had completely faded from the radar scopes. The cloud formation on the scopes did not hamper air control to any degree during ROMEO. 3. KOON Shot a _ a DELETED +“Fniwetok and Parry Islands, approximately 175 nautical miles from Ground zero, were bathed in brighter—than-daylight brilliance for several seconds after each of the other five CASTLE shots. KOON, in comparison, was likened to the explosion of a flash bulb. No usable data was obtained from the effects B-47 on this shot because of the low yield of the device and heavy cloud) cover which reduced thermal inputs below the minimum sensitivity of the calorimeters and radiometers. No temperature rises were observed in the aircraft skin. The shock wave reached the aircraft 110.7 seconds after Time Zero. The peak overpressure reading was 0.035 psi. In spite of poor weather conditions, including turbulent air in the flight orbit and several mechanical difficulties, the B=36 effects aircraft managed to attain its Time Zero position. No instrumentation data of value was obtained because of the low yield. There was no thermal “ ut. qu 7 o3