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Read more UPDATE: Coastal flood advisory affecting Northern California until Tuesday afternoon
At 7:19 a.m. on Sunday, the NWS San Francisco CA issued an updated coastal flood advisory in effect until Tuesday at 3 p.m. for San Francisco Bay Shoreline.
“Up to 1.5 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways,” can be anticipated according to the NWS. “At the San Francisco tidal gauge, high tide is expected to be 1.5 ft above normal (7.3 ft MLLW) at 12:18 p.m. Sunday 10/11, 1.2 ft above normal (7.1 ft MLLW) at 12:46 p.m. Monday 10/12, and 1.1 ft above normal (7.0 ft MLLW) at 1:14 p.m. Tuesday 10/13. These predictions include up to 1.2 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.”
“Flooding of lots, parks, and roads with only isolated road closures expected. High tides will result in flooding along coastal trails, cut off access to some low-lying beaches and coastal areas, and bring water and waves farther up the beach than typical,” adds the NWS. “If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.”
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This advisory is in effect until Tuesday at 3 p.m.
Ways to stay safe during a flood according to the NWS
If you live in a flood-prone area or are camping in a low-lying area, get to higher ground immediately. If told to evacuate, do so immediately. Lock your home when you leave. If you have time, disconnect utilities and appliances. Don’t go into a basement, or any room, if water covers the electrical outlets or if cords are submerged. If you see sparks or hear buzzing, crackling, snapping, or popping noises, get out. Stay out of water that may have electricity in it. Don’t walk through flood waters. It only takes 6 inches of moving water to knock you off your feet. If you are trapped by moving water, move to the highest possible point and call 911 if possible.
During heavy rain, flooding is possible, especially in low-lying and flood-prone areas. Never drive through water on the road, even if it does not appear to be deep. It takes just 12 inches of rushing water to carry away most cars, according to the NWS.
Rainy weather driving tips
- Turn on your headlights – Even when it’s light outside, using headlights can improve visibility and alert other drivers to your presence.
- On the road – Drive in the middle lanes and stay on high ground. Rainwater tends to stockpile on the edges of roads.
- Steer clear of puddles – Driving into puddles or low areas of rainwater can cause vehicles to hydroplane or skid out of control.
- Don’t tail large vehicles closely – Trucks or buses can kick up a water spray that obstructs visibility.
- Avoid flooded areas – When encountering a flooded road, do a U-turn and head back. The strong currents from flash floods can pull drivers off roadways. Driving through deep water can also negatively affect a vehicle’s mechanical and electrical systems.
What is hydroplaning?
Hydroplaning is when a vehicle starts uncontrollably sliding on wet roads.
This happens when water in front of the tire builds up faster than the vehicle’s weight can push water out of the way. The water pressure then causes the vehicle to rise and slide on a thin layer of water between the tires and the road, making the driver lose control. Hydroplaning is most commonly attributed to three factors:
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- Vehicle speed – When a vehicle’s speed increases, the tire-traction grip and ability to control the vehicle decreases. Drive at a reduced speed during wet weather.
- Water depth – The deeper the water, the sooner a vehicle loses traction on the road. It doesn’t matter how deep the water is, even a thin layer can lead to hydroplaning.
- Tire tread depth – Checking your tire tread before hitting the road is important, as low or no tread can lead to sliding.
In the event of your vehicle hydroplaning, here’s what to know:
- Ease off the accelerator – Step off the gas to slow down the vehicle until the tires find traction.
- Turn into the skid – Turning into the skid can help the vehicle’s tires realign to regain control.
- Make sure the tires reconnect with the road – During the skid, wait until the tires reconnect with the road and then gently straighten the wheels to regain control.
- Brake gently as needed – Brake normally if the vehicle has anti-lock brakes and pump brakes gently if in an older vehicle.
Source: The National Weather Service
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This story was originally published October 10, 2026 at 2:51 PM.