California fire officials are urging residents to remain vigilant as critical fire weather conditions are forecast to persist through Thursday, prompting an expansion of the Red Flag Warning to include parts of the Bay Area. In a social media update on June 10, CAL FIRE announced that the warning, initially in effect for portions of the northern Sacramento Valley from Wednesday morning through Thursday afternoon, now covers additional areas in the Bay Region.
The agency warned that a combination of strong north winds, low humidity, and dry vegetation creates conditions where a new fire could spread rapidly. Daytime relative humidity is expected to drop to between 9% and 15%, with overnight levels ranging from 25% to 50%.
This alert comes as California enters the peak summer wildfire season, when strong winds and dry brush can elevate fire danger significantly. CAL FIRE expanded the alert area as weather conditions evolved, emphasizing that critical fire weather has been predicted.
Authorities are urging residents to take precautions before an emergency occurs. "Be ready, not reactive," CAL FIRE said in its social media post.
Officials recommend packing a go bag with essential items, ensuring emergency alerts are enabled on mobile devices, and reviewing evacuation plans with family members. Residents are encouraged to monitor updates from the National Weather Service and local emergency officials as conditions change.
A Red Flag Warning is issued by the NWS when warm temperatures, very low humidity, and strong winds combine to create heightened fire risks. During such a warning, a small spark can develop into a dangerous fire.
Officials recommend the following precautions: if burning is permitted, all burn barrels must be covered with a weighted metal cover with holes smaller than three-quarters of an inch; do not throw cigarettes or matches out of a moving vehicle, as they can ignite dry grass; all outdoor fires must be extinguished properly using plenty of water, and the ashes must be stirred to ensure everything is cold to the touch; charcoal should be drowned in water until cold; live charcoal must not be left on the ground; and never leave a fire unattended, as embers or sparks can blow into leaves or brush and ignite a fire.