OptionalaltitudeAltitude range of the hazard (e.g. BTN FL280 AND FL380).
OptionalcauseCause of the hazard as stated in the DUE TO clause (e.g. "JTST", "FZRA", "WNDSHR ASSOCD WITH JTST").
The type of weather hazard.
True when the hazard is preceded by OCNL (occasional).
OptionalvisibilityVisibility below a threshold in statute miles, for dust/sandstorm SIGMETs (VIS BLW 3SM).
A single hazard description within a non-convective SIGMET. A SIGMET may contain multiple hazards (e.g. both icing and turbulence).