off. a bone dry fuel load that experts say makes these fires more volatile and dangerous, one official says on sunday this fire went from about 400 acres in size to 8400 acres in a couple of hours. the hot shots were working on hills and in canyons. these fires shoot quickly uphill. it was the sudden shifts in wind direction on sunday officials say that caught the hot shot negotiation a deadly trap. what caused the winds to shift so fast. sounds like there was a thunderstorm of down drafts and that changed the direction of the fire and pushed fire in the wrong direction. once they were trapped, officials say the hot shots deployed their shelters individual shells made of fire resistant material and lance cole got into one in about 15 seconds. it took me a little longer. pull it over you. when are you underneath the fire shelter according to shelby and lance you have to seal it like this to trap breathable air
sloughed off. reporter: a bone dry fuel load that experts say makes the fires more volatile. one official says on sunday the fire went from 40 acres in size to 84 acres in minutes. it was the sudden shift in wind directions on sunday that caught the hot shots in a deadly trap. what caused the winds to shift so fast? it sounds like a thunderstorm changed the direction of the fire and pushed fire in the wrong direction. reporter: once trapped officials say the hot shots deployed shelters. demonstrating the procedure for us firefighter lance cole got into one in about 15 seconds. it took me a little longer. pull it over you. when you are underneath the fire shelter you have to seal it like this to trap breathable air