Garcia technique From Cope (1996)
Developed to forecast maximum snowfall potential
Use model forecasts of the isentropic surface located about midway between the 700 mb and 750 mb pressure surfaces.
Average the mixing ratio directly over the area with the highest “effective” value upstream.
Use 6 hourly forecasts and total the average mixing ratio (g/kg) for each period.
Technique is very subjective and does not include an assessment of the vertical motion. Unfortunately, the amount of snow that falls is very dependent on the vertical motion!