VECTOR vecWind;
VECTOR vecWindTarget;

void weatherWind ()
{
	double directionChangeTimer = 0;
	double jitterTimer = 0;

	while (1) {

     	// Big direction and strength change after time
		if (directionChangeTimer <= 0) {

			directionChangeTimer = random(10) * 16; // Define new change interval

			// Rotate and scale target
			VECTOR* r = vector(15 - random(30), 15 - random(30), 0);
			ang_add(&vecWindTarget, r);
			vec_normalize(&vecWindTarget, 2 - random(1.5));
		}

		// Jitter
		if (jitterTimer <= 0) {

			jitterTimer = random(1) * 16; // Define new jitter interval

			// Slightly rotate the target vector
			VECTOR* r = vector(2 - random(4), 2 - random(4), 0);
			ang_add(&vecWindTarget, r);
		}

		// Let the wind vector smoothly transist towards the target vector
		vec_lerp(&vecWind, &vecWind, &vecWindTarget, 0.1 * time_step);

		// Count the timers down
		directionChangeTimer -= time_step;
		jitterTimer -= time_step;

		wait(1);
	}
}