SECRET 8nd biwetok had diminished to less than 2 millibars and the winds were becoz@ light and variable in the zone from 3,000 to 10,000 feet. Although considerableazmunts of medium AW3 high clouds were present during the days pfior to Zebra day, by noon of Zebra minus three the so~d cirro-stratusbagan to show signs of dissipation and the heavy haziness of the sky disappeared. There was a weak trough extendi~ fr~ the NE to the SW in the vicinity of Wake Islti with so~ evidence Of an incipient atmosphericwave passing Wake Islad during the night of Zebra minus four. It was expected that this wave would intensify only slightly because of the lack of a wll defined . cold tir source. The weather predictionspraaented at the formal weather brdefing for the Commander Joint Task Force Seven on 13~ of zebra -US three called for improving cloud conditionswith the lower trade wind conditions to remain llght in velocity but ha- southerly components in direction so as to be favorable for the radiologist. On Zebra minus two (13 May) tkmre was little change in the oversll weather situation. The skf ace pressure gradient from Wake Islarxi to the Marshslla had changed very little acxiwas still 1-2 millibars. Consequently,the timls continued vely light in the lower 15,000 feet. The weather reconnaissanceaircraft reported four tenths cumulus ad considerablecirrus. On Zebra minus one during the ~rningj the weather was idesl in the Eniwetok area there being a few low clouts and some very high SECTION XII ..* 1 .“ 55 SECRET I