Fw = 1/2 × ρ × Cd × A × V2
where
ρ = density of air (1.225 kg/m3)
Cd = drag coefficient
A = frontal surface exposed to the wind
V = wind speed in km/h
WAVE FORCES
A violent scirocco blew through that night, and the next morning Achim climbed above Playa Francesa to document the scene with our camera. All it had taken was for one anchor to slip, and others had followed suit. Two sailboats were laid over on the rocks, their owners wringing their hands on the shoreline. Four other cruising yachts limped into the harbour after having sustained dings and breaks. We heard all their horror stories; in each case, unfortunate circumstances had made it impossible to flee the anchorage and escape damage.