SANTA ROSA -- The Sonoma County Board of Supervisors was briefed Tuesday morning on the devastation caused by the 27,000-acre Tubbs Fire that has claimed seven lives in the county and discussed what one supervisor called "woefully inadequate" communication to county residents about the fire.

Sonoma County Assistant Fire Marshal Andrew Parsons said the Army National Guard was flying over the county Tuesday morning to get updated information about the extent of destruction.

The fire started around 9:45 p.m. Sunday off state Highway 128 and Bennett Lane in Calistoga. Fierce sustained winds drove the fire west to Santa Rosa, causing the worst damage in the north county and in northwest and northeast Santa Rosa where mandatory evacuations remain in effect.

As of 10:30 a.m. Tuesday, the Tubbs Fire has destroyed 550 residential structures and 21 commercial structures, according to Cal Fire.

Cal Fire assumed control over operations of the Tubbs Fire at 7 a.m. Tuesday, Parsons said.

Sonoma County sheriff's officials said 25,000 people have been evacuated, and they have received about 150 missing persons reports.

Parsons said 4,991 people are living in 34 evacuation centers that can accommodate 9,157 people, and 51,000 people are without power.

Board members expressed concern about the effects the temporary closures of Kaiser Permanente Santa Rosa Medical Center and Sutter Santa Rosa Regional Hospital are having on local health clinics and the ability of patients to renew their prescriptions.

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Board member David Rabbitt said the county's effort to provide information about the fires was "woefully inadequate," and other board members agreed.

"We had a press conference at 5 p.m. Monday. It should have been at 10 a.m.," Rabbitt said.

"I got a call from Sen. (Dianne) Feinstein and I had no information to give her. We need to work on the poor communication," Rabbitt said.