Red Flag Warning Just Got Called for Your Area — A Homeowner's Action Checklist

Every fall, the same pattern plays out across Southern California: the humidity drops, the Santa Ana winds pick up, and the National Weather Service starts issuing Red Flag Warnings for the hills above LA and the surrounding foothills. If you live in a wildfire-risk zone like I do in West Hills, you've probably seen the alert on your phone and felt that familiar tightening in your stomach — and then, if you're honest, not really known what to do next besides "be careful."

After the 2018 Woolsey Fire burned close enough to my neighborhood to change how I think about fire season for good, I went through CERT (Community Emergency Response Team) training to understand exactly what a Red Flag day should trigger for a homeowner. It's not a fire. It's a warning that conditions are lined up for one to spread fast if it starts. That distinction matters, because what you do in the hours after that alert — not during an actual fire — is what determines how ready you actually are.

What a Red Flag Warning Actually Means

The National Weather Service issues a Red Flag Warning when a specific combination of conditions is expected: low relative humidity, sustained wind (often gusty, and in Southern California that usually means Santa Ana or Sundowner winds), and warm temperatures — all at once, over dry vegetation. It's not a prediction that a fire will start. It's a statement that if one does start, from a downed power line, a spark, an equipment malfunction, anything, it can spread explosively before crews can get ahead of it.

That's the piece most homeowners miss. A Red Flag Warning is a call to action on a day with no fire yet — which is exactly the day you have time to prepare, and exactly the day most people do nothing because nothing visible is happening.

The Homeowner Checklist for a Red Flag Day

This is the same rundown I go through at my own house in West Hills whenever the warning goes up. None of it requires special equipment you don't already have on hand if you've prepared ahead of time — that's the point.

Around the house

• Clear anything combustible within 5 feet of your structure. This is the "Zone 0" area CAL FIRE has been finalizing statewide regulations around — dead leaves, mulch, firewood stacks, patio cushions, doormats. On a Red Flag day, walk that 5-foot ring one more time.
• Close up. Shut all windows, vents you can control, and pet doors. Bring in doormats and anything flammable sitting on a wood deck.
• Move vehicles. Park facing out in the driveway or garage, keys accessible, in case you need to leave fast.
• Charge everything. Phones, radios, backup batteries. Cell towers and power can go down during a fast-moving fire.
• Stage your hose and equipment where you can reach it in the dark. If you have a hydrant valve, wrench, hose, and nozzle, this is the day to have them staged by the door — not in a bin in the garage you'd have to dig through.

For your family

• Confirm your evacuation route — and a backup. In a fast-moving wind-driven fire, your usual route out of the neighborhood may not be the one that's open.
• Review your go-bag. Medications, documents, chargers, a change of clothes, pet supplies. Keep it by the door, not in a closet.
• Sign up for local alerts if you haven't already, through your county's emergency notification system, so you're not relying on word of mouth.
• Tell someone outside the area where you are. A simple text to a family member once conditions escalate is enough.

Know your limits

Everything above is about being ready to defend your property if there's time and it's safe to do so — not about staying to fight a fire that's already at your door. A few things worth repeating every fire season:

• If officials issue an evacuation order, go. Structure protection is something you attempt only when there's genuinely time and it's safe — never instead of evacuating.
• Check your local jurisdiction's rules on hydrant access and defensible space requirements before you need them. Rules vary by city and county, and your local fire department or CERT chapter can tell you exactly where you stand.
• Practice with your equipment before fire season, not during it. A Red Flag Warning is not the day to learn how a gated wye valve works for the first time.

The Gap Between "Prepared" and "Ready in 10 Minutes"

A lot of homeowners in fire country have done the defensible-space work — cleared brush, hardened vents, cleaned gutters. That's real progress, and it's the foundation everything else sits on. But defensible space reduces the odds a fire ignites your home in the first place; it doesn't do anything for you if embers are already landing and you want to actively wet down your roof, eaves, or a spot fire in the yard. That's a different tool for a different job, and it's the gap I built Ace Fire Defense to close: the same class of hydrant valve, hose, wrench, and nozzle professional crews use, sized and priced for a homeowner's garage.

If a Red Flag Warning has you realizing your equipment is still on a to-do list, get it staged before the next one — not during it.

See the Complete Hydrant Kit — hose, valve, wrench & nozzle, matched and ready to connect →

Sherwin Ross is the founder of Ace Fire Defense, based in West Hills, CA. After the 2018 Woolsey Fire, he became CERT-trained and started building wildfire defense equipment for homeowners.