WILDOMAR, Calif. (AP) — The Latest on Southern California wildfires (all times local):

8:10 p.m.

A wildfire sparked by a motorcycle crash in Southern California's Cleveland National Forest has grown to 350 acres and authorities are urging people in several communities to consider leaving.

The Riverside County Fire Department says evacuation warnings Thursday cover about 300 to 500 homes in and around Wildomar and Lakeland Village.

The Riverside Press-Enterprise says a mandatory evacuation is in place for five homes on a small road in the forest.

About 500 firefighters are battling the flames.

Authorities tell the paper the blaze erupted Thursday afternoon when a dirt bike on an off-road trail hit a bump and crashed into a tree. The throttle stuck and the engine's revving ignited leaking gasoline.

The rider had minor injuries.

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5:15 p.m.

A wildfire in Southern California's Cleveland National Forest is now estimated at more than 200 acres (81 hectares).

The fire was reported early Thursday afternoon in the Wildomar Off-Highway Vehicle area within the forest, about 70 miles (112 kilometers) southeast of Los Angeles.

Forest officials tweeted that no structures are immediately threatened as the fire moves to the northeast.

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A wildfire has erupted in Southern California's Cleveland National Forest and has spread over 100 acres (40 hectares).

The fire was reported early Thursday afternoon in the Wildomar Off-Highway Vehicle area within the forest, about 70 miles (112 kilometers) southeast of Los Angeles.

The National Forest tweets that no structures are immediately threatened.

The gusty Santa Ana winds that plagued Southern California earlier this week have vanished but temperatures remain very high and humidity levels are very low, meaning vegetation is very dry.

In Kern County, firefighters have contained 50 percent of a 40-acre fire near the community of Keene.