The US and Global Turbulence map layers in ForeFlight use distinct models to provide different turbulence forecasts.
US Turbulence Layer: This layer is based on NOAA's Graphical Turbulence Guidance (GTG) model, which forecasts multiple types of turbulence over the United States, including mountain wave turbulence.
Turbulence (US)
Global Turbulence Layer: The Global layer is derived from the Global Forecast System (GFS). Unlike the US layer, this global model focuses on clear air turbulence (CAT) without including mountain wave turbulence.
Turbulence (Global)
For more details about these layers, see More Turbulence is Better.
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