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What is SIEM? SIEM is the combination of two different types of products, SIM (Security Information Management) that gathers and creates reports from security logs and SEM (Security Event Manager) that uses event correlation and alerting to help with the analysis of security events.
SIGMET, or Significant Meteorological Information, is a weather advisory that contains meteorological information concerning the safety of all aircraft. There are two types of SIGMETs - convective and non-convective. The criteria for a non-convective SIGMET to be issued are severe or greater turbulence over a area, severe or greater icing over a area or IMC over a area due to dust, sand, or volcanic ash.