The Woodside Fire, burning in the forested coast south of Salt Point State Park since Thursday afternoon, was 30% contained at 140 acres Friday morning, with Highway 1 closed, evacuation orders near Jenner, and hazardous air along the Russian River.

The stretch of Highway 1 that runs above the Sonoma coast between Timber Cove Road and the Stewarts Point–Skaggs Springs Road is closed Friday, and the reason is burning just west of the pavement. The Woodside Fire, in the heavily forested coast about 30 miles north of Bodega Bay and south of Salt Point State Park, stood at 140 acres and 30% containment as of Cal Fire's Friday-morning update — a number that held, for the moment, after crews used favorable overnight conditions to stall the fire's forward spread.

It started small and fast. The fire broke out just before 3 p.m. Thursday, and by Friday morning more than 300 personnel were on it, with helicopters and air tankers pulled in from around the state. The cause is under investigation. Containment figures on a coastal fire in summer are a snapshot, not a promise, and the 30% Cal Fire reported Friday morning is where things stood then — not necessarily where they'll stand tonight.

The evacuation footprint sits along the coast near Jenner. Mandatory orders cover zone SON-1D1 along with Salt Point State Park, Stillwater Cove Regional Park, the Ocean Cove private camp and the Timber Cove subdivision; an evacuation warning is in place for the adjacent SON-1D2. Residents who had to leave were directed to a temporary evacuation point at Laguna High School in Forestville.

The more widely felt part of this fire is the air. Much of the North Bay woke Friday to haze, and the U.S. Environmental Protection Agency's monitors told the harder version of the story. Along the Russian River — Sebastopol, Guerneville, Forestville — readings ran between 200 and 700 as of 8:30 a.m., past the 300 mark the EPA treats as hazardous and, at the top of that range, more than four times it. Santa Rosa sat in the 100-to-200 band, unhealthy to very unhealthy. Farther south, Petaluma and Novato hovered in the low 100s, enough to warrant caution for the elderly, children and people with asthma or other respiratory conditions.

The Bay Area Air District, which issued a Spare the Air advisory, warned that smoke levels can shift fast and are hard to forecast, and urged residents to stay inside with windows and doors shut where temperatures allow. In Petaluma, resident John Cottrell told KQED he could smell the smoke but not yet see much of it: "For now it's okay, but I hope it dissipates."

For anyone driving the coast this weekend, the tell is simple: Highway 1 stops at the closure, and the ridgeline to the west is where the crews are.