What is the difference between retrospective and reforecast?

[yfhuang7]

WrfHydroForcing/core/config.py

Line 403 in b67cbe8

# If the Retro flag is off, and lookback is off, then we assume we are

I found out that the forecastMod.process_forecasts won't run if my configure doesn't have forecast flag on. But I'm not running for a real time instance; instead, I want to regrid and downscale the metrological forcing (except for the rainfall) for the past event (eg., 2016-2020) from NARR.