n_hours_per_met_file guidance

docs/configuration.md

@@ -63,7 +63,7 @@ str(receptors)
 | -------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `met_path`           | Absolute path to ARL compatible meteorological data files                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
 | `met_file_format`    | String detailing file naming convention for meteorological data files using a mixture of datetime and regex syntax. The formatting string accepts `grep` compatible regular expressions (`.\*.arl`), `strftime` compatible datetime strings (`%Y%m%d%H`) or any combination of the two. Datetime syntax is expanded to all unique combinations required for the receptor and simulation duration and the intersection between the requested files and files available in `met_path` is determined with `grep`, allowing partial matching and compatible regular expressions to be used to identify the relevant data. Matching does not require the full format to be specified - e.g. `\*.arl`, `%Y`, `%Y%m%d`, `%Y%m%d_d0.*.arl` would all match with a file named `20180130_d01.arl`. |
-| `n_hours_per_met_file` | Number of hours per meteorological data file. Defaults to 6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
+| `n_hours_per_met_file` | Number of hours per meteorological data file. To determine the number of hours in an ARL compatible meteorological data file, refer to the README, including the file naming convention, provided by the data source. For example, the [NOAA HRRR README](https://www.ready.noaa.gov/data/archives/hrrr/README.TXT) specifies a "6 hour data file beginning with 00z - 05z in the first file of the day". Defaults to 6                                                                                                                                                                                                                                                                                                                                                                |
 | `met_subgrid_buffer` | Percent to extend footprint area for meteorological subdomain when using `met_subgrid_enable`. Defaults to 0.1 (10%)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
 | `met_subgrid_enable` | Enables extraction of spatial subdomains from files in `met_path` using HYSPLIT's `xtrct_grid` binary prior to executing simulations. If enabled, will create files in `<output_wd>/met/`. This can substantially accelerate simulation speed at the cost of increased disk usage. Defaults to disabled                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
 | `met_subgrid_levels` | If set, extracts the defined number of vertical levels from the meteorological data files to further accelerate simulations. Defaults to `NA`, which includes all vertical levels available                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |