Lightning storms passing through the San Bernardino Mountains have started small lightning-related fires in the San Bernardino National Forest.

Firefighters are working to suppress all of the fires using fire engines, hand crews and helicopter water drops. The U.S. Forest Service is conducting aerial reconnaissance flights each day over the forest to assist with the detection of new lightning-related fires. The flights are part of the Forest Service's normal operating plan after lightning storms.

On Sept. 6, the following lightning-related fires were reported:

• 8:57 a.m., the Poopout Fire near Poopout Hill in the San Gorgonio Wilderness. It's a single snag and a helicopter is dipping out of Jenks Lake.

• 8:58 a.m., the Grinnell Fire near Grinnell Mountain in the San Gorgonio Wilderness is a single snag. A helicopter is dipping out of Jenks Lake.

• 9:54 a.m., Sugarloaf 2 is southwest of Sugarloaf Mountain, and is a single snag with 20 x 20 ground fire holding in a rocky area.

• 2:45 p.m., the Bertha Fire is a half-mile east of Bertha Peak. It's a single juniper tree on fire with low potential for movement. A helicopter is dipping out of Stanfield Marsh.

And on Sept. 7, at 1:19 p.m., the Jenks Fire near Jenks Lake, is 0.1 acres and contained.

According to the U.S. Forest Service, the exact locations of thunderstorms are difficult to forecast accurately more than a few hours in advance. The approach of a thunderstorm is commonly heralded by booms of thunder growing louder and closer. Sometimes lightning is visible without the sound of thunder and at other times thunder is audible without flashes of lightning. Both need to be taken seriously and cover sought before the arrival of a storm.

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