whatA field of grass, each blade a small spring bending under whatever pressure passes. The wind itself is never drawn -- travelling packets of it cross the field from the west, and the only evidence is the bending.

whyThe claim: the invisible becomes visible -- gusts cross the canopy as coherent waves of bending, and the grass alone is an ANEMOMETER. Two observer rows of blades, a known distance apart, keep ledgers of their bending; the cross-correlation lag between those ledgers reads the wind's speed from the canopy, and it is printed beside the wind's true speed for you to compare. Sweep the cursor to throw a gust of your own and watch it cross; raise the storm slider and the weather rises with it.

howSprings (stiffness 42, damping 5.5) driven by a wind field of two low travelling waves plus advecting Gaussian gust packets born at the western edge, all seeded -- and the whole pattern moves at ONE speed (Taylor's frozen wind), which is what makes the reading honest. The storm slider scales amplitude and gust frequency. The speed measurement uses only what the grass does -- no blade asks the wind field where it is going.