convective SIGMET

convective SIGMET (convective significant meteorological information)

Weather advisory concerning convective weather significant to the safety of all aircraft. Convective SIGMETs are issued for tornadoes, lines of thunderstorms, embedded thunderstorms of any intensity level, areas of thunderstorms greater than or equal to VIP (video integrator processor) level 4 with an area coverage of 4/10 (40 percent) or more, and hail 3/4 in or greater. VIP 4 means very heavy intensity of precipitation as indicated on conventional weather radar.
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At 1855, a convective Sigmet was issued, advising of a line of thunderstorms 50 miles wide along a line that went through the accident region.
Through TIS-B and FIS-B data, the RANGR FDL-978-XVR gives aircraft access to high integrity traffic data as well as a variety of free weather data including: Aviation Routine Weather Reports (METARs), Non-Routine Aviation Weather Reports (SPECIs), Terminal Area Forecasts (TAFs) and their amendments, graphical NEXRAD (regional and CONUS) precipitation maps, Airmen's Meteorological Conditions (AIRMET), Significant Meteorological Conditions (SIGMET) and Convective SIGMET, Winds and Temperatures Aloft and Pilot Reports (PIREPS).
We were under a convective SIGMET (significant meteorological advisory), with conditions not expected to change through the night.
The briefer informed him his route was under a convective SIGMET.
When the FAA's Aviation Weather Center has not issued a Convective Sigmet, but its air route traffic control centers get pilot reports or radar indications of thunderstorms, the center meteorologist may issue a center weather advisory (CWA) giving essentially the same type of warning.
The Convective SIGMET indicates a possible issuance for the ETA of 1700Z, the affected area just touching the destination.
In fact, when I spoke with AWC meteorologist Jim Roets last summer, he mentioned, "As late as last week we had an issue with the Convective SIGMET.
Jacksonville Center issued a Convective Sigmet and at the end of the transmission the controller announced, ".
If you are delayed beyond this, deep, moist convection that meets convective SIGMET criteria will tend to be much more active in the afternoon, destroying your chances for a direct routing.
The sky may already be lit up with active thunderstorms showing up nicely on NEXRAD and protected by a fence called a Convective SIGMET (WST).
Convective tops, however, are not always covered by AIRMETs and it's rare to see an advisory issued for a healthy field of cumulus clouds that don't meet Convective SIGMET criteria.