phenomenon is blowing (valid with %GWEATHER_PHENOMENON_SNOW, %GWEATHER_PHENOMENON_SAND, %GWEATHER_PHENOMENON_SPRAY, %GWEATHER_PHENOMENON_DUST)
phenomenon is moving across (valid with %GWEATHER_PHENOMENON_SAND and %GWEATHER_PHENOMENON_DUST)
phenomenon is freezing and involves ice
phenomenon is heavy or predicted to be heavy
value not available
maximum value of the enumeration
phenomenon is light or predicted to be light
phenomenon is moderate or predicted to be moderate
no qualifier for the phenomenon
partial fog (only valid with %GWEATHER_PHENOMENON_FOG)
patches of fog (only valid with %GWEATHER_PHENOMENON_FOG)
shallow fog (only valid with %GWEATHER_PHENOMENON_FOG)
phenomenon is heavy and involves showers
phenomenon will be a thunderstorm and/or will include lightning
phenomenon happening in the proximity of the location, not in the actual location
An additional modifier applied to a #GWeatherConditionPhenomenon to describe the current or forecasted weather conditions.
The exact meaning of each qualifier is described at http://www.weather.com/glossary/ and http://www.crh.noaa.gov/arx/wx.tbl.php