Cold front
Warm front
Stationary front
Occluded front
Trough
Squall line
Dry line
Tropical wave
Isobar
Ceiling < 1000'
Visibility < 3 mi
Ceiling 1000-3000'
Visibility 3-5 mi
Moderate or greater turbulence
Freezing level at surface
Freezing level above mean sea level
Area of precipitation
         Rain:  light - moderate - heavy
        Snow:  light - moderate - heavy
Thunder:  with rain - with snow - without precipitation
Shower:  rain - snow
Drizzle
   Freezing rain - freezing drizzle
Ice pellets or sleet