SIGMET This is an acronym for significant meteorological observations used in aviation forecasting. When significant events are observed or forecast a SIGMET is ussued to help pilots plan routes and anticipate conditions.
SIGMETs are issued for 6 hour periods for conditions associated with hurricanes and 4 hours for all other events. If conditions persist beyond the forecast period, the SIGMET is updated and reissued.
SIGMET - SIGnificant METeorological hazard or event. Aviation term for any hazardous or important meteorological concern to the aviation community. Often used with thunderstorms as a CONVECTIVE SIGMET.
These SIGMET items are considered to be widespread because they must be affecting or be forecast to affect an area of at least 3000 square miles at any one time.
It provides year-round products involving marine forecasting, aviation forecasts and warnings (SIGMETs), and surface analyses. The unit also provides satellite interpretation and satellite rainfall estimates for the international community.
SIGMET information Meteorological information issued by a watch office concerning the occurrence or forecast of weather phenomena which may affect the safety of aircraft operations.
Browse Related Terms: Coastal/Lakeshore Flood Advisory, CSTL, FAWS, Freezing Spray Advisory, Heavy Surf Advisory, High Surf Advisory, High Wind Advisory, Lake Effect Snow Advisory, Relocated, SIGMET, Tropical Advisory, VAAC ...
SIGMETSignificant Meteorological AdvisorySignal-to-Noise RatioA ratio that measures the comprehensibility of data, usually expressed as the signal power divided by the noise power, usually expressed in decibels (dB).
 See also: Forecast, Air, Light, Temperature, Storm
  
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