  Context. Atomic and molecular line emissions from shocks may provide valuable
information on the injection of mechanical energy in the interstellar medium
(ISM), the generation of turbulence, and the processes of phase transition
between the Warm Neutral Medium (WNM) and the Cold Neutral Medium (CNM).Aims.
In this series of papers, we investigate the properties of shocks propagating
in the WNM. Our objective is to identify the tracers of these shocks, use them
to interpret ancillary observations of the local diffuse matter, and provide
predictions for future observations.Methods. Shocks propagating in the WNM are
studied using the Paris-Durham shock code, a multi-fluid model built to follow
the thermodynamical and chemical structures of shock waves, at steady-state, in
a plane-parallel geometry. The code, already designed to take into account the
impact of an external radiation field, is updated to treat self-irradiated
shocks at intermediate (30
