After a lightning strike, heat gets stuck in the ground and causes fires hours later.
Firefighters say with the dry heat we're experiencing now, lightning can be a huge danger... especially when the moisture levels are as low as they have been recently.
"If the lightning's hit something and the wind comes up we have what we call one hour fuels," Chief Mike Spring said. "It may have rained two inches on top of it, but an hour later, if the moistures go down and the wind picks up then that fuel can burn."
We do have red flag fire warnings in the Tri-Cities, even extending into Oregon right now.
Chief Spring says the warnings are caused when the moisture is way down and the dry heat could rapidly spread fires caused by lightning.