Off-Axis Experiment in the Numi Beam at Fermilab

The NuMI neutrino beam at Fermilab will provide the most intense high energy neutrino beam in the world. We describe briefly the NuMI beam and its current status, a possible detector for an off-axis experiment, and the potential sensitivity for ν_μ→ν_e oscillations. It is shown that with a low Z 50 kt detector, one can improve on the current limit from CHOOZ in a 5 year run by a factor of about 20.