We consider the effect of vertical outflows on the mean-field dynamo in a t
hin disk. These outflows could be due to winds or magnetic buoyancy. We ana
lyse both two-dimensional finite-difference numerical solutions of the axis
ymmetric dynamo equations and a free-decay mode expansion using the thin-di
sk approximation. Contrary to expectations, a vertical velocity can enhance
dynamo action! provided the velocity is not too strong. In she nonlinear r
egime this can lead to super-exponential growth of the magnetic field.