UPDATED July 20; we added this time-lapse video that was shot by Christopher Redmond Thursday near Highway 385 just north of Pringle, SD. Here is how he described it:

First day of the Myrtle Fire southwest of Rapid City and east of Pringle, SD as it explodes. Fire was pretty much plume dominated until winds shifted out of the east in the late evening. Several large bursts in fire activity caused some pyrocumulus to redevelop during the last gasp of daylight.

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Original article, July 19, 2012:

We posted more information about the Myrtle Fire in South Dakota earlier, but here are a couple of short video clips that were shot Thursday evening.