The Finger Rock Fire near Pontatoc Canyon has grown to about 750 acres, officials said Thursday evening.
The fire's new size was a result of more accurate fire mapping, officials said.
The fire showed minimal fire behavior on Thursday. Some moisture fell in the area and more is expected Friday.
The fire reignited Wednesday afternoon, producing smoke that could be seen across Tucson. Flames were visible for many Tucsonans Thursday night.
The fire was started July 29 by lightning but was dampened by storms. The fire smoldered but erupted as the vegetation dried out.
No crew was fighting the fire overnight.
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