All the weather models rely on comparing their predictions to observations. That is how they keep their models real.
So yes, people compare model predictions to observations on a regular (like every 6 hours) basis.
watchwolf49, magnetohydrogoddamnics is even worse.
EDIT: Oh, and congratulations on your word coinage: Google has never seen that term before, but it’s quite apt.
More importantly than [del]hydrodynamics[/del] hydrogoddamnics is [del]thermodynamics[/del] thermogoddamnics. Most of the science of forecasting is about heat flows. The atmosphere is a huge undifferentiated heat engine. And thermo is one of the other physics topics that make undergrads seriously contemplate changing major to philosophy or something squishy like that. 
BTW, MHD is part of another meteorological discipline: space weather. (AKA “applied astrophysics”)
OK, “thermogoddamnics” does have a smattering of hits (132, as of this moment).
It takes nerves of steel to post that word … [shivers] … I admire your courage …