Ice Water Content from GFS file

Equations 10 and 11 require the ice water content. I can't find it in the GFS grib2 file variables. Did I miss it, or is possible to derive it from the available information. Right now I have pressure, temperature, and relative humidity.

There is a parameter ice water mixing ratio in the gfs.t<hour>z.pgrb2.0p25.f<step> file given at isobaric levels.

• To get the IWC, I would multiple by the density of dry air? – Craeft Mar 30 at 11:32