Could dawn helicopter patrols warn Pearl Harbor?

Could routine anti-submarine helicopter patrols give Pearl Harbor more warning of the incoming attack?

Yes; helicopters already airborne around dawn could spot the strike and give aircraft crews and gunners extra time to prepare.

An anti-submarine patrol could already be airborne at dawn as part of routine base defense. Its crew might spot the incoming Japanese aircraft before the attack reached the harbor and pass a warning. The helicopter would not need to intercept the strike to matter; extra warning could help aircraft crews and anti-aircraft gunners prepare. This remains a contingent possibility rather than a guarantee that the attack fails.