El Niño Is Almost Here: How to Get Ready for a Wild California Winter

If you've noticed the memes about "Godzilla El Niño" floating around, or your uncle keeps saying "this is the big one," here's the deal: it's true this time. As of this writing, NOAA has an El Niño Advisory in effect, with more than a 90% chance of a very strong event through the winter, with the odds tilting toward one of the strongest El Niños on record. The heaviest rain signal is pointed squarely at coastal California, and forecasters expect it to peak between January and March.

So what actually is El Niño? In plain terms: it's a warming of the ocean surface in the central and eastern tropical Pacific. That warm water shifts the jet stream, which in turn steers more (and stronger) storms toward California. Translation: expect a wetter-than-normal winter, with the potential for atmospheric rivers, heavy Sierra snowfall, and periods of intense rain up and down the state.

We're not going to sugarcoat it: El Niño winters have historically brought serious flooding, mudslides, and property damage to California. That's real, and it needs to be taken very seriously. But we're also a little excited about what a strong El Niño usually means for the mountains: big snow years. Tahoe, Mammoth, and the rest of the Sierra could be in for an epic season. So think of this guide as "yes, and" - yes, get your rain gear and your house in order, and get your skis waxed, because it might be a winter to remember in more ways than one.

Here's how to prep, broken out for our Northern and Southern California neighborhoods, since El Niño doesn't hit NorCal and SoCal quite the same way.

NorCal: Prepping the Bay Area and Beyond

For Northern California, the biggest risks are atmospheric rivers - long plumes of tropical moisture that can dump inches of rain in a day - along with swollen creeks and rivers, saturated hillsides, and king tides pushing water into low-lying bayside neighborhoods.
 

Waterproof Yourself

Before you buy anything new, check what you already own. A rain jacket that's a few years old often just needs to be re-waterproofed rather than replaced - the fabric's still fine, but the durable water repellent (DWR) coating has worn off, which is why water starts soaking in instead of beading up.

• Refresh your gear with Nikwax. A wash-in or spray-on waterproofing treatment can bring a well-loved jacket, pair of boots, or even a tent back to life in about 20 minutes.
• Patch, don't pitch. Small tears or seam failures in jackets, waders, or rain pants can usually be fixed with a waterproof seam sealer or repair tape rather than a full replacement.
• Check the basics: boots, umbrellas, coats. If your rain boots have cracked soles or your umbrella's ribs are bent, it's cheaper to replace those small items now than to deal with soggy socks all winter.
   

Waterproof Your Stuff

Your car takes a beating in a wet winter, and a lot of the fixes are simple and cheap if you handle them before the first big storm.

• Check your tire tread now. Bald or low-tread tires lose grip fast on wet roads - the classic penny test (Lincoln's head visible = time to replace) takes 10 seconds.
• Replace worn wiper blades. If they're streaking, skipping, or squeaking, don't wait until you're driving blind in a downpour. Most blades need replacing every 6–12 months.
• Pack a car kit. A flashlight, a portable charger, extra bottled water and a compact tarp are worth keeping in the trunk in case you get stuck somewhere without power or cell service during a storm.
   

Waterproof Your House

• Know where to get sandbags before you need them. Many Bay Area cities and counties offer free self-serve sandbag stations - check with your local public works department or fire station, and don't wait until a storm is 24 hours out, since lines get long fast.
• Shore up doors and windows. Weatherstripping, door draft stoppers, and simple window sealant can meaningfully cut down on water intrusion during wind-driven rain.
• Have a tarp on hand. A heavy-duty tarp is one of the most useful things you can own in a storm — for covering a leaky roof section, protecting firewood, or securing anything stored outside. Be sure to have some bungee cords on hand, too.
• Charge up before the power goes out. Bay Area outages tend to follow big wind and rain events. A portable power station or charger bank means your phone (and your ability to check alerts) stays on. And don't forget flashlights, headlamps, and lanterns!
   

NorCal: Bookmark These for Storm & Flood Alerts

• NWS San Francisco Bay Area/Monterey - official forecasts, watches, and warnings for the Bay Area
• SF72 - San Francisco's official emergency preparedness hub, run by the SF Department of Emergency Management
• Cal OES Storm Season Safety - statewide flood and storm safety guidance from California's Governor's Office of Emergency Services
• CalAlerts - sign up for free wireless emergency alerts by county
• Cal OES MyHazards - look up flood, fire, and earthquake risk for your specific address
• Caltrans QuickMap - real-time road closures and conditions during storms

SoCal: Prepping LA, Ventura, and the Inland Empire

Southern California's El Niño risks look a little different: debris flows and mudslides below recent burn scars, flash flooding in canyons and washes, and coastal flooding from big surf and high tides. Even a moderate amount of rain can cause outsized damage on hillsides that have been stripped bare by wildfire.
 

Waterproof Yourself

Just like up north, start with what's already in your closet.

• Re-waterproof before you replace. A Nikwax treatment restores water repellency to jackets, boots, and even backpacks that have lost their beading power.
• Fix small failures. Peeling seams or small punctures in rain gear are an easy DIY fix with a waterproof patch or seam sealer.
• Stock up on the essentials. SoCal rain often comes in short, intense bursts - a good rain shell, real rain boots (not just water-resistant sneakers), and a sturdy umbrella or poncho go a long way.
   

Waterproof Your Stuff

• Get your tires checked before the rain starts. Tread that's fine for dry SoCal driving most of the year can be dangerously thin once the roads are slick - worth a quick shop visit now.
• Swap out old wiper blades. SoCal drivers often let these go longer than they should since it rains so rarely - but that also means blades tend to be more dried out and cracked than you'd expect.
• Keep an emergency kit in the car. A portable charger, bottled water and a compact tarp take up almost no space and can make a big difference if you're caught out during a flash flood closure or power outage.
   

Waterproof Your House

• Locate your nearest sandbag site now, especially if you're near a recent burn scar. Cities and counties across Southern California typically open free sandbag stations ahead of forecasted storms - check your city or county's website before the rain arrives.
• Seal up doors and windows. Weatherstripping and door draft guards help keep wind-driven rain from finding its way inside, especially in older homes.
• Keep a tarp and basic drainage tools on hand. A tarp (secured with bungee cords) can protect vulnerable areas of a roof or cover outdoor equipment, and clearing gutters and drains before storms hit is one of the simplest ways to prevent water damage.
• Have backup power ready. Storm-related outages happen in SoCal too — a charged portable power station keeps your phone and any medical or safety devices running. Don't forget the flashlights, headlamps, or lanterns!
   

SoCal: Bookmark These for Storm & Flood Alerts

• NWS Los Angeles/Oxnard - official forecasts and warnings for LA, Ventura, Santa Barbara, and San Luis Obispo counties
• NWS San Diego - official forecasts and warnings for San Diego, Orange, Riverside, and San Bernardino counties
• Ready LA County - LA County's official emergency preparedness and alert sign-up hub
• CalAlerts - sign up for free wireless emergency alerts by county
• Cal OES MyHazards - look up flood, fire, and debris-flow risk for your specific address
• Cal OES Storm Season Safety - statewide flood and storm safety guidance

However this winter shakes out, a little prep now means less scrambling later - and more time to actually enjoy the snow when it comes. Stay dry out there, California.