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.
When one reads about the true events leading up to the Pearl Harbor sneak attack, many of the problems and signals were either ignored or neglected by higher ups, people in authority, heads of state or cabinet level positions or by the military itself. It was disgraceful to say the least.