The 1989 BBC documentary Sacrifice at Pearl Harbor presents evidence that at least two Western intelligence services intercepted the “East Wind Rain” execute message on December 4. The documentary includes interviews with Eric Nave and Ralph Briggs, two cryptographers who were involved with the interception and processing of the “Winds” code message (Nave) and the subsequent “East Wind Rain” execute message (Briggs). The “Winds” code message explained the code words that would be used to signal war with America, England, or Russia. “East Wind Rain” meant war with America (however, some who saw it interpreted it as meaning war with both America and England).
Nave was a senior Australian cryptographer and was so renowned that he was sometimes called "the father of British code breaking in the Far East." Nave was on duty in Melbourne, Australia, when the “Winds” code message was broadcast on November 19. Nave helped transmit a copy of the message to Commodore J. W. Durnford of the Australian Navy. In 1991, Nave teamed up with James Rusbridger to write Betrayal at Pearl Harbor. Nave and Rusbridger note that the “East Wind Rain” execute message was intercepted on December 4 by Lt. Charles Dixon, a cryptographer with the New Zealand Army, at a listening post near Hong Kong:
News broadcasts from Tokyo that carried the "execute" weather forecasts were designed to be heard around the world—in Britain, Western Europe, Australia, and South America—and were repeated several times during the day of December 4. They had been easily picked up in Melbourne, and FECB [British Far East Combined Bureau] had no problem hearing them at their powerful intercept station on Stonecutters Island in Hong Kong, which could eavesdrop on everything sent by radio from Japan. . . .
Both parts of the Winds message [the code and the subsequent execute] were received by Lieutenant Charles Dixon, RNZVR [Royal New Zealand Volunteer Reserve], a code breaker stationed at Stonecutters Island in 1941. After the surrender of Hong Kong, on 25 December 1941, Dixon was a prisoner of war with other officers, including Lieutenant Cedric Brown, RNVR [Royal Naval Reserve]. Dixon told Brown of receiving both parts of the message, and how surprised he was that the Americans were caught unprepared at Pearl Harbor because of the information he had been receiving and decoding in Hong Kong on behalf of FECB, which he assumed was being passed on to the Americans. Charles Dixon died in New Zealand on 10 June 1985 at the age of seventy-seven. Cedric Brown was the senior naval officer on the C-in-C's staff in charge of codes and ciphers.[19]