From the 1994 NYT article:
To paraphrase the other article 'America failed to put 2 and 2 together to make 4' - i.e. Given their own intelligence gathering they would almost certainly have identified that Pearl Harbour was a target for the Japanese given their previous.
From the site I mentioned above (my bolding):
"The time has come for Britain to declassify its full contemporary records or the myth will grow on this side of the Atlantic that American history is being held hostage by the British obsession with secrecy," Mr. Costello said.
From the site I mentioned above (my bolding):
On November 19, 1941, the Foreign Ministry in Tokyo sent out a 'Purple' message to its embassies and consulates around the world. It instructed them to listen to Japanese news bulletins. If they ended with a weather report saying 'east wind rain' the attack would be on the US. 'North wind cloudy' would mean an attack on Russia, and 'west wind clear' would herald an attack on the British, with an invasion of Thailand or Malaya, or an attack on the Dutch East Indies. Both the British listening station in Melbourne and the American station in Seattle intercepted this and reported it to London and Washington respectively. While the Japanese diplomatic traffic still talked of negotiation, JN-25 traffic intercepted by the British talked of 'opening hostilities.' From November 21, it was clear that an attack was being set in motion and a large Japanese fleet was being assembled. Meanwhile, Japanese merchant ships were sailing home.
Comment