Airship Guide

[Portley]

No wind = A few items (mainly junk like empty crystals/clay) + low quantity, High winds = better loot (HQ materials and materia) + higher quantity, Turbulent/Violent winds = junk items + low quantity (pretty much the same as no wind.).

I found the same thing when looking at logged data. Its weird, you would think it would be something like:

No wind = most favorable collection condition
high wind = medium favorable collection condition
violent turbulence = least favorable collection condition

in reality the logs say high wind tends to give the most items followed by no wind and then violent turbulence being a huge penalty to qty collected