SIGMET:
A SIGMET is short for 'significant metrological information'. It's significant weather information, which applies to the safety of all aircraft. SIGMET's consists of two different kinds; convective and non-convective.
Convective SIGMET. Weather advisory concerning convective weather significant to the safety of all aircraft, including thunderstorms, hail, and tornadoes.
Related Definitions from Aviation Glossary ...
SIGMET. The acronym for Significant Meteorological information. A weather advisory issued concerning weather significant to the safety of all aircraft.
SIGMET - warning of severe weather conditions (active thunderstorms, hail, severe turbulence, icing etc.) issued my Met offices.
sl - sea level.
SIGMET
A severe aviation weather advisory. The same sorts of things that would cause an AIRMET to be issued can cause a SIGMET to be issued, though a SIGMET means that the conditions are significantly more severe.
SIGMET
A SIGnificant METeorological advisory that warns of phenomena that affect all aircraft. SIGMET advisories cover severe and extreme turbulence, severe icing, and widespread dust or sandstorms that reduce visibility to less than 3 miles.
SIGMET
Significant Meteo (hazardous weather warning)
SIGNAL
Part of received data that is desired; Compare: noise, offset ...
SIGMET- A weather advisory issued concerning weather significant to the safety of all aircraft. SIGMET advisories cover severe and extreme turbulence, severe icing, and widespread dust or sandstorms that reduce visibility to less than 3 miles.
prepare SIGMET and other information relating to its area of responsibility;
supply SIGMET information and, as required, other meteorological information to associated air traffic services units;
disseminate SIGMET information; ...
Information, is a concise description of the occurrence or expected occurrence of specified en route weather phenomena which may affect the safety of aircraft operations, but at intensities lower than those which require the issuance of a SIGMET.
Airman's Meteorological Information (AIRMET): An in-flight weather advisory concerning weather phenomena of less severity than that covered by SIGMETs, which are potentially hazardous to certain aircraft, e.g.
SIGMET is a more inclusive type of advisory.
Alternate: Airport indicated on a flight plan where it is possible to divert the aircraft from its scheduled destination (in case of bad weather or any other major situation).
SELCAL - Selective Calling
SSR - Secondary Surveillance Radar
SID - Standard Instrument Departure
SIGMET - Significant Meteorological Information
STAR - Standard Terminal Arrival Route
STOL - Short Takeoff and Landing ...
Forecast conditions, destination and departure airport, TAF
Current conditions, destination and departure airport, METAR
Winds aloft forecast
Any pilot reports and NOTAMs
Any other weather data: AIRMET, SIGMET etc ...
 See also: Weather, Aircraft, Service, Air traffic, Direct
  
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