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I left my apartment in Norman at 2:15am CDT to drive south on I-35 towards a storm that was approaching Pauls Valley. I stopped near Goldsby, OK only a few miles south of Norman and set up underneath a Texaco with an open view to the west and northwest. I was underneath the northen part of the anvil, and crawlers were frequent, with a few making ground contact a mile or so to the NW of my location.
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I left the Texaco and drove west a bit where I parked on a small road and set my tripod out the window while shooting from inside the truck. Anvil crawlers we beginning to the south and extended over my head, so with the ground contacts seen just a few minutes prior, I was not going to stand outside with no shelter. The focus of this location was a tree which stood alone in the middle of a small field.
At 3:30am I drove back to Norman, and while on E 12th steet there was a bright channel just to the west, less than 1/2 mile away. After the one or two return strokes you could see beading in the channel, and only seconds later was the crack and boom of its thunder.
Looking at data the next day, a heatburst can be detected at about 3:20am CDT from the Minco, OK meteogram.
Also you can see the cause of the heat burst on this short nids animation. Notice how the thunderstorm cluster near southwest of KTLX drops out and the outflow boundary expands.
Data: