The woman was found Wednesday morning in Forestville, where her car was 8-10 feet underwater, the Sonoma County Sheriff's Office says.
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The victim has been identified as Daphne Fontino, of Ukiah, California in Mendocino County.
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The sheriff's office says that Fontino first called 911 after 10 a.m. on Tuesday, saying that her car was stuck in floodwaters in the 6000 block of Trenton-Healdsburg Road and that water was in the car.
The call was then disconnected.
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The Marine Unit, several helicopters, deputies, and rescue teams all responded to the scene and searched for the car and driver until sunset, but were unsuccessful.
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Crews then began their search again on Wednesday morning and found the car submerged about 100 yards off the road.
A Marine Unit deputy dove down and determined there was a body in the car, which deputies and fire personnel then removed.
Fourteen other people have died in California as a result of the severe storms and flooding.
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"The sheriff's office sends our condolences to victim's family and friends during this challenging time," the office said in a press release posted on Facebook.
The sheriff's office also thanked Sonoma County Fire and CHP for helping in the search.