Strong winds are fueling the explosion of the Springs Fire in Southern California, with evacuations ordered and thousands of acres already scorched.

Springs fire, which had spread quickly by windy conditions, at least 45% contained on Saturday, say fire officials

The Riverside County Springs fire, fueled by strong Santa Ana winds up to 50 mph on Friday, did not grow overnight.

As of Saturday morning, the Springs fire had grown to over 4,000 acres, with 45 percent containment.

The Springs Fire broke out about 11 a.m. Friday and by the evening had grown to about 5.47 square miles, with fire crews starting to contain it. The cause of the fire east of Moreno Valley in Riverside County is under investigation. It was not immediately known how many households are under evacuation warnings or orders.

Strong winds died down late Friday and into the early morning, allowing firefighters to make progress. But more winds are expected on Saturday.