PHOENIX -- Higher humidity overnight helped make conditions at a deadly Arizona fire a bit less volatile Tuesday morning, but fire officials said the Yarnell Hill Fire is still zero percent contained.
Officials added that thunderstorms that bring little rain and lightning are a threat because of the dry vegetation.
The fire has burned about 8,400 acres. About 400 firefighters are on site trying to bring the blaze under control.
Winds were calm at the start of Tuesday but thunderstorm cells were visible.
The fire killed 19 of the 20 firefighters from the Granite Mountain Hotshots Sunday when they were overtaken by the flames. The Prescott-based crew was memorialized by the town Monday evening.
For volunteer, fundraising and other ways to assist those affected by the Yarnell Hill Fire, go to yarnellfallenfirefighters.com.