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Move all hard-coded paths to configuration files

Move all hard-coded paths in https://github.com/UW-Hydro/monitor/blob/develop/tools/bin/ecflow/processes/main/meteorological/get_metdata.py to configuration files.

Implement VIC 5

This calls for changes in the current Run VIC step. VIC 5 can be implemented once the sub-daily met generation step has been added.

Move historic CDFs to single netCDF file

Historic CDFs are currently written (once) to one ascii file per variable per grid cell per day of year (365). A single file is read in per variable for grid cell every day in the real-time system. The Weibull plotting positions are also calculated each day. It should be faster to write these values (once) to a separate netCDF file for each day of year (365) so that only one file needs to be read in in real-time everyday when calculating current percentiles.

This would look something like:

netcdf cdf.mm-dd {
dimensions:
        lon = 245;
        lat = 195;
        rank = 150;
variables:
	double lon(lon) ;
		lon:long_name = "longitude" ;
		lon:units = "degrees_east" ;
		lon:standard_name = "longitude" ;
	double lat(lat) ;
		lat:long_name = "latitude" ;
		lat:units = "degrees_north" ;
		lat:standard_name = "latitude" ;
	int rank(rank) ;
		rank:long_name = "rank" ;
                rank:description = "rank of variable relative to its own time series" ;
		rank:units = " " ;
	double weibull(rank) ;
		weibull:long_name = "weibull_plotting_position" ;
                weibull:description = "calculated as rank/(n+1)"
		weibull:units = "percent" ;
	double swe(lat, lon, rank) ;
		swe:long_name = "snow water equivalent" ;
		swe:units = "mm" ;
	double sm(lat, lon, rank) ;
		swe:long_name = "soil moisture" ;
		swe:units = "mm" ;
	double tm(lat, lon, rank) ;
		swe:long_name = "total moisture" ;
		swe:units = "mm" ;

Generate sub-daily forcings for VIC 5

A step needs to be added to the workflow: Generate sub-daily forcings for VIC 5. At first, we will simply use the sub-daily forcing generator embedded in VIC 4.2.