During ZIP-LIP operations, launch procedures utilize appropriate hand, flag, and light signals unless radio communications are required for what purpose?

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The key idea is that hand, flag, and light signals on the flight deck cover standard, time-critical actions and coordination, but there are certain types of information that must be conveyed directly through radio because they can change rapidly and require immediate, real-time communication to the shooter and deck control.

Weather updates fit that need. Winds, gusts, deck conditions, visibility, and other meteorological data can change quickly and significantly affect launch timing and safety. Getting that information across rapidly and directly via radio ensures everyone involved has the latest data to make informed decisions about whether to proceed, delay, or abort a launch.

Other options describe information that is already managed through standard signaling or typically conveyed through other channels when necessary, whereas weather updates specifically rely on real-time radio communication to be effective in the launch context.