  The forecasting of solar energetic particles (SEPs) is a prominent area of
space weather research. Numerous forecasting models exist that predict SEP
event properties at proton energies <100MeV. One of these models is the SPARX
system, a physics-based forecasting tool that calculates >10MeV and >60MeV flux
profiles within minutes of a flare being detected. This work describes SPARX-H,
the extension of SPARX to forecast SEP events above 300MeV . SPARX-H predicts
fluxes in three high energy channels up to several hundred MeV. Correlations
between SEP peak flux and peak intensity of the associated solar flare are seen
to be weak at high energies, but improved when events are grouped based on the
field polarity during the event. Initial results from this new high energy
forecasting tool are presented here and the applications of high energy
forecasts are discussed. Additionally, the new high energy version of SPARX is
tested on a set of historic SEP events. We see that SPARX-H performs best when
predicting peak fluxes from events with source locations in well-connected
regions, where many large SEP events tend to originate.
