The tide table is the new weather app for any coastal trip

What if the most useful forecast for your next beach trip isn't about rain or sun, but about the water coming up the street? This week in Southern California, a swell small enough to be a non-issue still came with a closed coastal highway.

Here is what happened. Per the Press-Telegram, a preliminary reading at the San Pedro tide gauge hit 8.02 feet on Monday morning. That broke the previous record of 7.93 feet, set in January 2005, according to the National Weather Service. Newport Beach's gauges read 8.3 feet, nearly 2 feet above the predicted 6.6 feet. Caltrans closed the northbound lanes of Pacific Coast Highway near Bolsa Chica for a few hours. On Tuesday, the city of Huntington Beach closed the road in both directions from 8 a.m. to noon.

The flooding was not limited to one county. ABC7 reported that a coastal flood warning for the Orange County coastline ran through 1 p.m. Thursday. It also reported that sidewalks at Redondo Beach's King Harbor went under, and that a restaurant there closed temporarily and bailed out with buckets.

The gap between the table and the sea is the real story

The most telling number is not the record. It is the difference between prediction and reality. The astronomical prediction said about 6.6 feet in Newport Beach, and the gauge said 8.3. The Press-Telegram notes that warm-water expansion, recent rains and currents can push levels higher than expected. It also says a Kelvin wave that crept in from the equator is gone for now. A Redondo Beach resident told ABC7 that waves from the equator added a foot to the highest tides.

That matters for travelers. A tide table is a necessary tool, but it isn't a guarantee. In our view, the smart habit is to treat the published number as a floor and add a margin of a foot or two on days when the local news is already talking about warm water or storms. Then ask the hotel directly about the street, the garage and the ground floor, not just the view.

A calm day is the trap

We tend to plan around bad weather. King tides reverse that logic. CBS12 explains that they are tied to the positions of the moon and sun, and that local conditions such as wind and rainfall can push water levels higher or make flooding worse. So the risky morning is not always the stormy one. In our view, a quiet-looking day can still be a flood day. Flooding in Sunset Beach, per ABC7, began around 9:30 a.m. and caught residents who had sandbagged anyway.

This is not only a California story. In Florida, CBS12 describes flooded roads in Palm Beach County and a closed Juno Beach Pier. We would not read all of this as a verdict on one coast. It is a pattern: low-lying waterfront areas, with harbor walls, boardwalks and beach-access roads, are the first places to fail.

What to do before you book

First, look at the tide window, not just the date. Here the peaks were in the morning, with the astronomical high at 9:52 a.m. on Tuesday, and the highest daily tides were forecast to ease slowly through Thursday. Morning is when many people drive to breakfast or catch a ferry. The Balboa Ferry, for instance, paused car transport from 8 a.m. to noon, though pedestrians were still welcome ("bring your boots," a social media post said).

Second, be careful with the car. ABC7 cites AAA and a Long Beach mechanic warning that saltwater can cause corrosion and, for electric vehicles, a fire risk days or weeks later. A rental parked on a low street is a liability. Ask where to park it.

Third, expect more. According to ABC7, higher tides are expected in November and December, right as waterfront businesses head into Thanksgiving and Christmas. The same report says NOAA expects this El Niño to strengthen into the winter months. Whether this becomes the norm is a prediction, and a Long Beach Post headline says scientists call the record tides and flooding "a preview" of what's coming. We think that is a fair framing, even if we can't say how often it will repeat.

Our verdict

Don't cancel your coastal trip. The Pacific Coast Highway is still one of the great drives, and a closure of a few hours is an inconvenience, not a catastrophe. But add the tide table to your checklist, next to the forecast and the cancellation policy. Favor stays on higher ground or with flexible terms in the weeks ahead. Build slack into any itinerary that depends on a low coastal road in the morning. Locals are already doing exactly that: as one King Harbor boat owner put it, this winter they'll all be "checking our apps." Visitors should too.