The two blazes were reported at 12:35 p.m. Wednesday -- the first in the area of Riverdale Drive and Highway 371, the second about three-quarters of a mile to the south at Bradford Road and Gelding Way -- according to the Riverside County Fire Department.
The agency said that multiple engine and hand crews from the county and surrounding agencies were sent to the location and encountered flames moving at a rapid rate at the larger brusher along Riverdale.
The second fire at Bradford was a slow-mover, burning a couple acres before firefighters began establishing tentative containment lines.
Overnight, the blaze grew to nearly 1,100 acres with just 10% containment.
There were no immediate reports of confirmed injuries or structures damage.
Cal Fire says crews continue making good progress on the fire's perimeter.
The causes of the two fires were not immediately known.
Evacuation orders are in place for the following zones:
CBI-CAHUILLA-1
Evacuation warnings are in place for these zones:
RVC-TULE1
RVC-TULE2
RVC-TULE4
RVC-TULE6
RVC-TULE7
RVC-TULE8
RVC-2327
RVC-LAKERIVERSIDEESTATES4
RVC-TABLEMT4
RVC-TABLEMT5
North of Tule Peak Road
West of Eagle Nest Court
South of Highway 371
East of Bradford Hills Road
A shelter for people impacted by the fire has been set up at the Anza Community Center. An animal shelter has been set up at the Riverside County Department of Animal Services located at 581 S. Grand Avenue, San Jacinto.