The Precipitation Index Humidity Method allows for the estimation of relative humidity based upon the amount of precipitation at each grid cell (if the domain is gridded) or at the subassin level (if the domain is non-gridded). This method is described within Anderson (2006) and Follum et al (2015). Both a Wet Humidity percentage and a Dry Humidity percentage need to be specified by the user along with a Precipitation Rate Threshold. If the daily amount of precipitation exceeds the precipitation rate threshold, then the wet humidity percentage is used. Otherwise, the dry humidity percentage is applied.
Required Parameters
The user must specify a precipitation rate threshold in units of inches per day or millimeters per day. Additionally, a wet humidity and dry humidity value must be specified, both in units of percent.