Same here, more so to do with cloudy nights, but hoping to see at least one decent display this season.

You will know them when you see them Don, especially if its a striking display. Normal clouds at night will look dark as they are not lit by the sun, even areas with LP with have the classic orange LP glow under the clouds. NLCs glow from reflected sunlight while normal weather clouds are in darkness, mainly because NLCs are 83km high, highest clouds on earth, their structure is quite distinct, at times sharp and the best displays have an alien look to them, to top this off they have a nice silvery blue colour often described as electric blue. Once you see a good display you will be able to spot them easier next time.

Thanks!