Thank you. So here are 2 screenshots, using the HRRR model which provides the highest resolution for USA in Windy. They are without and with Premium. I do not see any difference in speed or in direction of the wind.

The grid of the model (3 km distance between the grid points) is not fine enough to take into account all topographic details.
See a theoretical plot of the HRRR grid made with the Distance & planning tool. In addition to the horizontal grid, the topography model of the weather model is even coarser.

But Premium has many other advantages.

Lake Lanier, Georgia, USA just north of Atlanta, Georgia.

The wind gets real squirrelly around “Three Sisters” and “Lights Ferry” islands coming from the leeward side.

But it depends where this lake is located. If a high resolution model (1 to 2km resolution) is available in this area, the map for the wind could be improved. But with the default weather model (9 km) or other medium resolution models, I doubt you get a more detailed wind map.

Could you show a screenshot of this lake with the current wind forecast ?