WEAVERVILLE (CBS/AP) — Fire officials say a lightning-sparked blaze in the Shasta-Trinity National Forest has grown to 1,331 acres and is about 5 percent contained Saturday morning.

The U.S. Forest Service says crews working in warm and windy conditions successfully built and improved containment lines overnight but that moderate winds could help it spread, mainly south.

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Saddle Fire Map

A Forest Service map shows the area burned in the Shasta-Trinity National Forest. (CBS)

The lightning-sparked blaze broke out in the Shasta-Trinity National Forest about halfway between Eureka and Redding, where temperatures were in the 90s Friday and expected to stay the same through the weekend.

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The Forest Service says power has been restored to the town Hyampom, which went dark when the fire began because power lines run close to the blaze.

The fire that started Tuesday is the largest of 20 lightning-sparked blazes that have broken out in the area this week.

Saddle Fire Hotspot

A lightning-sparked blaze broke out in the Shasta-Trinity National Forest about halfway between Eureka and Redding. (CBS)

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