Oh what a night! June 11, 2015 found me in far southeastern Colorado chasing storms. We chased this beast for a long ways and while it never did drop a tornado, it did give us some nice looks.
This image is taken after dark and those clouds are being lit up the intra-cloud lightning. It was an absolute non-stop light show.
If you look close, you can see a small town almost directly under the stormcell. It dropped baseball size hail and the straight-line winds downed powerlines.