What are the meaning of the signal in the NAM file?

[niuniu]

Hi, sir,

I get the meteorological parameters about some day in the NAM file , but I do not know the exact meaning of some signal in this file, for example Hmsl/FHR, Mdl sfc,could you help me?

[glenn.rolph]

Hmsl = height above mean sea level
FHR = forecast hour
MSLP = mean sea level pressure
Mdl sfc = Model surface height

[Ololo]

Thank you, glenn.rolph