What warnings did the United States government and military have to indicate that the Japanese might attack Pearl Harbor?

Answer 1

None. MLM The military did know that an attack from Japan was imminate. What it did lack was where the attack would happen. US military intelligence broke the Japanese code messages sent to the Japanese ambassodors in Washington that stated that they wanted them break off communications with America and to destroy all records and papers. This was a sign that an attack was coming. So the Americans knew an attack was coming but did not know where. Submitted by Mark Webb St. Louis, Missouri yet again by examining intercepts by "magic" it is apparent that there were many warnings for the coming hostilities from a long time preceading Dec 7 all the way up to the night before hostilities commenced.