YARNELL, Ariz. - Fire officials say they're concerned about strong winds and potential thunderstorms Tuesday as crews battle the Yarnell Hill Fire southwest of Prescott.
A meteorologist at the scene said winds have the capability of getting up to 80 miles per hour.
As of 10 a.m. Tuesday, the acreage remained at 8,400 overnight and the fire is zero percent contained.
RELATED: Storms, lightning threaten Arizona after fires (http://bit.ly/12jSuic)
Officials do not expect further contained Tuesday, they said in a 10 a.m. news conference.
"Everything out there that is combustible is burning," a fire behavioral analyst said in a Tuesday morning news conference.
ABC15 crews at the scene also confirmed the U.S. military is sending four C-130's to help battle the Yarnell Hill Fire.
The bodies of 19 firefighters killed battling the fast-moving fire Sunday were transported Monday to the Medical Examiner's Office in downtown Phoenix.
RELATED: Authorities identify fallen firefighters (http://bit.ly/yffnames)
Prescott Fire Chief Dan Fraijo said all 19 of those killed were members of the Granite Mountain Hotshot crew out of Prescott.
Fire officials said crews died when the winds turned around and they were caught in a bad situation. He said it was a catastrophic situation with dry vegetation fueling the fire.
The official investigation into what exactly happened will begin Tuesday, according to the 10 a.m. news conference.
The wildfire sparked just southwest of Prescott after an apparent lightning strike around 4:30 p.m. (MST) Friday.
For information on how to help Arizona fire victims , visit http://bit.ly/helpariz.
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