Didn’t Signals Intel also know about Pearl Harbor but higher ups like that commie FDR hushed it up.
Some of the daring and bravery of the US Navy in the Pacific was pretty amazing including Task Force Taffy.
You are correct. All the warning signs were there. Also, there were some seriously bad atmospherics in Hawaii that morning and signals relayed from DC via CA didn’t make it through. They had to rely on commercial teletype via the undersea cable to pass the intel to Admiral Kimmel and General Short. The message got there after the attack had begun.