Kilometers to Beaufort

/**
 * Kilometers per hour to
 * Beaufort scale
 *
 * @param kmh
 * @returns {number}
 */
function kmh2bf(kmh) {
	var bf = 0;
	var i = 0;
	var scale = [
		1.1,
		5.5,
		11.9,
		19.7,
		28.7,
		38.8,
		49.9,
		61.8,
		74.6,
		88.1,
		102.4,
		117.4
	];

	while (scale[i] && kmh >= scale[i++]) {
		bf = i;
	}

	return bf;
}