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http://www.freerepublic.com/focus/f-news/1225646/posts Mushroom Cloud [in Utah?]
Coast to Coast AM ^ | Friday, September 24, 2004 | Brian Justice

Posted on 09/24/2004 8:02:58 AM EDT by Momaw Nadon

On our way back home from a family drive on 8/29/04 my wife and I noticed a peculiar mushroom cloud just east of our home in Wellington, UT. We ran into the house and brought our both of our digital cameras and started snapping pictures. Within 2 hours there were three different “explosions” resulting in mushroom clouds.

We emailed a local news station; they looked into the pictures but to no avail. There were truck drivers parked at the gas station just down from our home, the drivers did not dare drive the road for fear of whatever was happening out there. Pretty scary afternoon, especially during this time of heightened alert in our nation.

--Brian Justice

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[nwctwx]

that looks like a brush fire to me...

[MontanaMatt]

The pictures are very similar to events that I have witnessed here in Montana in late August during extreme fire seasons. When the forest fires burn hot in the late afternoon, the smoke columns carry smoke, burning embers, pine needles, and even pine cones high up into the atmosphere just like a thunderhead (with lightning).

[JustPiper]

what on earth would cause that?! wherever did you find this?!

[LayoutGuru2]

Wow, that is a great shot of an isolated cumulus formation. Downright eerie - Definitely something hot at the base. With the right conditions a large, localized fire can produce a pyrocumulus like these.

http://www.crh.noaa.gov/unr/rcfwm/2000/033000_firecu.htm
http://www.schools.ash.org.au/paa1/photogallery4.htm (see pics at the bottom of the page)