ant ground to cross and form a pattern not unlike a cloth such as gaberdine. Figures 6 and 7 show the early development of this cirrus deck. Aerial weather reconnaissance of the area about the Pacific Proving Grounds before the shot found the usual amount of trade shower activity. Following the shot reconnaissance to the northeast of ground zero reported no shower activity although a few cumulus tops rose tc 9,900 feet in the ‘period up to H plus 14 hours, By H plus 22 hours the most pronounced to 174° E. At H plus 36 hours an area of moderate rain, definitely fall- ing from middle clouds, was observed on a line from 15° N. 170° E. to ee toe ee Sa penED Peete area of shower activity was found between 15° N. to 16° N. and 172° E, Analysis of the synoptic weather charts subsequent to the shot teneeteg showed no unusual developments. —_o eon ene 17.59 N. 173.5° E, i | 1 ! ! aaa 5001bk2 eee