Flash Flood Watch to Saturday Evening

A flash flood watch was issued for Saturday afternoon and evening for an area including the Redlands-Loma Linda area and the San Bernardino Mountains, with potential for isolated thunderstorms and heavy rains.

"Monsoonal moisture in southeast flow aloft will continue today . . . with sufficient daytime heating and instability," the National Weather Service advised. "This will feed slow-moving thunderstorms with the moisture needed to cause very large rainfall amounts and flash flooding."

in Mill Creek Canyon unleashed boulders, mud and debris that flooded parts of Valley of the Falls Drive in Forest Falls east of Redlands and Loma Linda.

Some people walking on the north side of Mill Creek near Big Falls were cut off Friday by a sudden surge in the wash, volunteers at the Big Falls picnic area visitors booth said Saturday. A swift-water rescue team responded to help the stranded people cross the swollen creek.