code: public String getAlertDescription(int index){
  		if(index < 0 || index >= alert.length )
  			return null;
  		else
  			return alert[index].getDescription();
  	}
docs: Returns the description for the alert. Returns null if index doesn't exist.
  For more information refer to the API Docs:
  <a href="https://developer.forecast.io">https://developer.forecast.io</a>
  @param index index to get
  @return the description for the alert. Null if index doesn't exist.