Twilight Lightning & Mammatus

1 NE of Roundup MT; 19 June 2013

Short animation of tripodded still imagery.
Use the controls above the images to stop, start, step forward and backward, and change loop speed. Slam the speed bar all the way to the right for fastest animation.

Direction of view is NE. Image interval is ~40 seconds at 9 images. Each image is a time exposure of a field of mammatus moving to the left (N) in fading twilight, as lightning occurs in the backside of a departing thunderstorm complex.

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