Notice the lowered area under the updraft base just left of center in the picture. As the updraft intensified, a lot of rising scud appeared, and it quickly congealed into a solid lowering - I'd definitely call it a wall cloud since it was right under the main updraft. I did not see any rotation, and it was too far away to verify it if there was any - but I doubt it represented any real threat, since tornadoes are very rare in this area, and it gradually disappeared in rain the next five minutes or so - but it looked impressive for a while.
When I got home, I noticed that the tower above where I had seen the lowering was overshooting the rest of the storm's top by quite a bit, so after unloading a bunch of stuff I had in the car I grabbed better cameras and headed back toward where I could see the storm. By the time I got to a place with a good view, it was about a half hour after I took the picture above, and the storms had congealed into a line of heavy storms over the San Juan Mountains east of Pagosa Springs. Here is a panorama I stitched from six shots with the zoom lens:
Nothing real out of the ordinary, but nice to see some kind of storm structure in a hot, dry year in which there hasn't been much. Below is a more zoomed shot showing the interaction of the storm's cloud-base features with the mountains:
You see lots of features like this when you get strong storms in mountainous areas due to the effects of the mountains on near-storm wind flows, and of course the mountains often either trigger storms or intensify ones that have already formed as air flowing toward the mountains is forced upward.
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