ADDS - Aviation Digital Data Service

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  • Graphical Turbulence Guidance (GTG)
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The GTG is an automatically-generated turbulence forecast product that supplements AIRMETs and SIGMETs by identifying areas of turbulence. The GTG is not a substitute for turbulence information contained AIRMETs and SIGMETs. It is authorized for operational use by meteorologists and dispatchers.