  A simplified Lagrangean closure for the Navier-Stokes equation is used to
study the production of intermittency in the inertial range of three
dimensional turbulence. This is done using localized wavepackets following the
fluid rather than a standard Fourier basis. In this formulation, the equation
for the energy transfer acquires a noise term coming from the fluctuations in
the energy content of the different wavepackets. Assuming smallness of the
intermittency correction to scaling allows the adoption of a quasi-gaussian
approximation for the velocity field, provided a cutoff on small scales is
imposed and a finite region of space is considered. In this approximations, the
amplitude of the local energy transfer fluctuations, can be calculated self
consistently in the model. Definite predictions are obtained on the scaling of
the wavepacket energy moments.
