phenomenon is blowing (valid with GWeather.ConditionPhenomenon.SNOW, GWeather.ConditionPhenomenon.SAND, GWeather.ConditionPhenomenon.SPRAY, GWeather.ConditionPhenomenon.DUST)
phenomenon is moving across (valid with GWeather.ConditionPhenomenon.SAND and GWeather.ConditionPhenomenon.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.ConditionPhenomenon.FOG)
patches of fog (only valid with GWeather.ConditionPhenomenon.FOG)
shallow fog (only valid with GWeather.ConditionPhenomenon.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 GWeather.ConditionPhenomenon 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