of tops to 5000 feet restdnder 0530M tops 3000 feet. Local area still the same with 4-5/10s low C1OWS. NO showers on radar scope. ThiS last nport until ‘Ha hour. At 0215M the time having been fixed by the Commander, JTF 7, an informal briefing for members of the staff was held. The purpose of this briefing was to forestall the take off of the drone aircraft in the event that inclement weather or winds had developed or were forecastthat might require a decision to delay the operation. On the basis of the weather briefing at 021~ the operation was on. At this ti~, the previous forecast of a few widely scattered showers was abandoned, first due to the lack of development of the low clods, ad secomily no inversion waa developing in the lower layers from which showers sdght be formed by rsdiotional cooling. At the 0445M weather briefing the winds had now become southwesterly fnxn 6000 to f+5,000feet. The weather was essentially tb osaa as briefed at 18(IOMand 0215M. The decision to continue the opexation was made, and the Zebra day test was conducted acoording to schedule. 4. Commnts The preparation of a study on the mov~ent of troughs fzmm the Japanese Empire to the Eniwetok area was of great aid in formulating tlm outlook forecast for Zebra day. With the results obtained from thi8 ele&?ntary type study, a positive evaluation of the weather influence resulted in a decision that Zebra day should not be advlmced by one day. SECTION XII 53