Strong winds are already blowing in Yucaipa, which isn't helping the fire situation.
"With the wind blowing through basically it's like a hair dryer," said Cal Fire Riverside Battalion Chief Mark Barr. "It's going to physically carry off moisture. We're going to have really low humidities with this offshore event, which is going to promote drying."
On Wednesday, Cal Fire Riverside drilled its inmate crews in anticipation of the busy fire season ahead.
Conditions are dangerous because crews are often the line in the sand between a fire and a home.
That's why being able to lay down a fire line is so important, especially with wind-driven fires.
"Fire cannot travel across this line if it is put in properly, and that will hold the fire," said Cal-Fire Riverside Captain Doug Cade.