Random Array of sounds for Random Game Object

I want to Randomly create an array of Thunder Sounds to play when the GameObject comes into scene.

In other words, I have a Random Lightning script that works perfectly to summon a Lightning.Prefab into the scene, this prefab also play a single audio with it, but I want it to play a random array of thunder sounds instead.

I am sure we would need to put this on the the Lightning Randomizer Script, so here it is:

 #pragma strict
 //Objects
 var Lightning : GameObject;
 var Box : GameObject;
 
 //Box Attributes
 private var BoxLength : float;
 private var BoxWidth : float;
 private var BoxHeight : float;
 
 //random Values
 private var randX : float;
 private var randZ : float;
 private var randY : float = BoxHeight;
 
 //timer settings
 private var timer : float = 0.0;
 var Mult : int = 0.1; 
 
 function Update () {
 //seting up boundrys
 BoxLength = Box.gameObject.transform.localScale.x;
 BoxWidth = Box.gameObject.transform.localScale.z;
 BoxHeight = Box.gameObject.transform.localScale.y;
 
 //setting up the random values
 randX = Random.Range(0,BoxLength);
 randZ = Random.Range(0,BoxWidth);
 
 //bringing the lightning in and randomizing the x and z
 timer -= Time.deltaTime*Mult;
     if(timer <= 0){
         Instantiate(Lightning);
         Lightning.transform.position.x = randX;
         Lightning.transform.position.z = randZ;
         timer = 1.0;    
     }
 }