hello every one,
stall is only function of angle of attack(alfa),eg, the wing of a parked aircraft in a 10kts headwind is not stalled.
i think that roughly 15° angle of attack will represent a stalled condition for a civil aircraft. less in a dynamic overshoot.
certification rules require a stall warning 7% above stallspeed, buffeting and/or stickshaker/pusher(for T-tails), assuming a speed reduction of 1kt/sec.