*this* .... when training to fly your rough wx penetration speed is generally 15-20 kts north of V1 or takeoff speed .... there is a set configuration and airframe characteristic for rough air penetration. Shear in a mesovortex can rip the wings off the plane as the airframe is stressed beyond its engineering limits or shredded by winds from opposing directions that can unduly stress the airframe or defeat lift thus creating a stall