  Light sterile neutrino oscillations can be partially or completely washed out
at short-baseline experiments due to the breaking of neutrino production
coherence. In this work we address this issue in sterile searches at
$\nu$STORM, an experimental proposal for a beam of neutrinos from the decay of
stored muons. We work with 3+1 and 3+2 models, the latter introducing CP
violation at short-baselines. We find that decoherence effects are only
relevant for sterile masses above $\Delta m^2 \gtrsim 10$ eV$^2$, and that,
even in that regime, we are able to place strong appearance bounds in such
clean environments. In addition, the novel signatures of CP violation in the
parameter space of interest can be identified with a significance of up to
$\gtrsim 3 \sigma$.
