8 3 5 5 before the shot. Then 15 hours before the shot, a weak indreft appeared 200 miles north of BIKINI, and the cutdraft was foreed south. The perturbations had no apparent sonneetion with the eireulation above and below 10,000 feet; therefore a forecast for light veritable feet was issued. When a more definite forecast was desired, a statenant was iseued to the effect that a trend toward westerly winds was expected, (2) b2B of the forecast vind speeds deviated 6 incts or less from the observed, and 86% deviated 10 imcts or lese, The maximum error was 1. kncts at 20,000 feet. Keg),