London Telegraph 
Monday, Dec 08, 2008
A new study has concluded the US did not have advance warning about Japan’s plan to bomb Pearl Harbor.
Research has been released on the 67th anniversary of the attack on the key naval base which forced America to join World War II.
There have long been allegations that some in Washington knew in advance that the Japanese planned to target Pearl Harbor on December 7, 1941.
Now, a team at the National Security Agency (NSA) has carried out a study which rules out the long-held theory surrounding one of the Second World War’s most enduring mysteries
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According to historians, secret messages buried in Japanese-language weather reports, meant to alert Japanese diplomats worldwide to destroy confidential codes as war with America, Russia and Britain was beginning, did not reach US officials prior to the attack.
Under Japan’s “winds execute plan”, East wind rain meant the US, north wind cloudy was the erstwhile Soviet Union and west wind clear was Britain if diplomatic relations were “in danger” with one of three countries.