Clicking in the check box activates the wind settings.
Animation will only begin once play is clicked.
Inputting a value one frame higher than the end of your Timeline will ensure you have a perfect loop, with no jumping in your animation.
Animation demonstrating the Loop Time feature, set to repeat all forces every 30 frames.
The Wind Strength slider can be taken to 100%, but manually inputting the numbers means that you can select a Wind Strength setting of well over 100% to simulate gale forces.
This slider needs to be above 0 (zero) % in order to see any movement in the animation.