Playing with or against the wind is part of the beach ultimate experience. It's like salt on your meal. Just a bit of salt and your meal taste better. But too much salt can make you meal not eatable any more. Last March in Marseille (France), for the "Bulf à l'eau" tournament, we played with a wind of 50-60km/h on Saturday. This strong and cold north wind is called "Mistral". It was hard but still playable (of course every little throwing mistake sent you disc away). But on sunday morning, the organisers eventually had to cancel the tournament because the "Mistral" was blowing at more than 100Km/h.
So, when is the wind too strong for playing beach ultimate ?