Red Flag Warning, Heat Advisory Issued For Napa County, North Bay

NORTH BAY, CA — UPDATED June 22, 2018: What was a fire weather watch was upgraded Friday to a red flag warning for the mountains of North Bay and the hills of East Bay. The red flag warning — when high temperatures, low humidity and gusty winds combine to create critical fire weather conditions — is set to go into effect at 11 a.m. Saturday and last through 8 p.m. Sunday, according to the National Weather Service San Francisco Bay Area.

Residents are urged to refrain from any outdoor fires or burns, as any wildfires that develop will spread quickly.

The red flag warning is accompanied by a heat advisory from 11 a.m. to 8 p.m. Saturday for much of the Bay Area. Widespread temperatures in the mid 90s to low 100s in the impacted areas are expected, according to NWS. The hottest inland locations such as Pinnacles National Park and the extreme inland portions of Napa, Sonoma, and possibly Contra Costa counties may surpass 105 degrees.

NWS officials warned of moderate to high risk of heat-related illness, especially for vulnerable populations during the day Saturday.

Bay Area cities included in the heat advisory are: Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Blackhawk, Scotts Valley, Boulder Creek, Day Valley, San Jose, Greenfield and King City.

PG&E has activated its emergency operations center due to the red flag warning and elevated fire dangers in the North Bay, according to PG&E Spokeswoman Deanna Contreras.

PG&E meteorologists are predicting Saturday to be the hottest day of the year, which means PG&E wants its customers to prepare for outages.

"We don’t anticipate needing to do a Public Safety Power Shutoff. But we do want customers to update their contact info at www.pge.com/mywildfirealerts," Contreras said in an email Friday morning.

ORIGINAL POST June 21, 2018: A fire weather watch has been issued for North Bay mountains and interior valleys this weekend because of high temperatures combined with northerly winds, according to the National Weather Service San Francisco Bay Area. The watch is set to go in effect midday Saturday and continue through Sunday evening.

Temperatures will likely reach the 90s to 100s across interior areas, leading to widespread moderate and locally high potential heat risks, weather officials said. A heat advisory is in effect for Saturday when the highest temperatures are expected.

In Napa, the high is expected to reach 101 degrees Saturday, according to the current NWS forecast.

Photo: Shutterstock.com