# Hurricane Marie Swell Meets Peak Tides: NWS Coastal Flood and High Surf Advisories for OC Beaches Through Tuesday

> NWS High Surf and Coastal Flood Advisories for Orange County beaches, driven by Hurricane Marie's swell on top of peak astronomical tides, run through 11 p.m. Tuesday, Sept. 8, 2026, with a 7.0-ft high tide at Newport Beach at 7:59 p.m. Tuesday. Newport Beach lifeguards made more than 170 rescues on Saturday alone, surf flooded and closed the Seal Beach pier parking lots through Wednesday, and Metrolink suspended Orange County Line service between Laguna Niguel/Mission Viejo and Oceanside on Monday after the LOSSAN tracks at San Clemente flooded, with delay risk through Thursday, Sept. 10.

- Canonical: https://ocint.app/situation/oc-coastal-high-surf-king-tide-advisory-2026-09-04
- Markdown: https://ocint.app/situation/oc-coastal-high-surf-king-tide-advisory-2026-09-04.md
- JSON: https://ocint.app/api/situations/oc-coastal-high-surf-king-tide-advisory-2026-09-04
- Status: active
- As of: 2026-09-08T07:09:10.232+00:00
- Started: 2026-09-04T00:00:00+00:00
- Cities: Dana Point, Huntington Beach, Laguna Beach, Newport Beach, San Clemente, Seal Beach
- Publisher: OCINT (https://ocint.app)

## Who / What / Where / When / Why

**Who:** NWS San Diego (advisory authority); Metrolink and LOSSAN (rail closure/delay warnings); Seal Beach residents (cleanup and berm reinforcement); San Clemente city (coastal management).
**What:** NWS High Surf Advisory and Coastal Flood Advisory covering all OC coastal areas from Seal Beach to San Clemente, driven by a long-period south swell from Hurricane Marie coinciding with the year's largest astronomical tides.
**Where:** Full OC coast from Seal Beach to San Clemente, including Huntington Beach, Newport Beach, Laguna Beach, and Dana Point. Confirmed flooding at Seal Beach pier/boardwalk. LOSSAN rail line closure at San Clemente.
**When:** Advisories in effect 6 a.m. Saturday Sept. 5 through 11 p.m. Tuesday Sept. 8, 2026. Peak flood risk: Monday Sept. 7 and Tuesday Sept. 8 evening high tides. Metrolink delay risk persists through Thursday Sept. 10 when tides reach 6 ft or higher.
**Why:** A long-period south swell generated by Hurricane Marie offshore is arriving simultaneously with the year's highest astronomical tides, amplifying wave runup, rip currents, and low-lying coastal flooding beyond what either factor would cause alone.

## Narrative

## Current Status

NWS High Surf and Coastal Flood Advisories remain **active** for all Orange County coastal areas through **11 p.m. Tuesday, Sept. 8, 2026**. NWS San Diego reissued both advisories at 8:40 p.m. PDT Sept. 7 with unchanged end time; updated parameters note breaking waves of **4–7 ft with sets to 9 ft**, strong rip and longshore currents, and minor coastal flooding of lots, parks, and roads at evening high tides. The predicted higher high tide at **Newport Beach** on Tuesday is **7.0 ft at 7:59 p.m.**

## Confirmed Impacts

Surf from Hurricane Marie washed over berms and **flooded parking lots and the boardwalk near the Seal Beach Pier** across the Sept. 5–7 weekend, according to ABC7. Residents were clearing debris and reinforcing their homes Monday, Sept. 7 ahead of another evening high tide. The **LOSSAN rail line through San Clemente was closed** after rainfall and high surf struck the coast, per Voice of OC reporting from Sept. 6. Metrolink warned Sept. 7 that **Orange County Line trains near San Clemente could see delays through Thursday, Sept. 10** whenever a high tide reaches 6 ft or higher, per OC Register.

## Hazard Overview

- **Waves:** 4–7 ft with sets to 9 ft; 6–10 ft on south/southwest-facing beaches at peak.
- **Currents:** Strong rip currents and longshore currents throughout the advisory period.
- **Flooding:** Minor coastal flooding of beach parking lots, parks, and low-lying roads; isolated closures expected near peak evening high tides.
- **Erosion:** Beach erosion likely at exposed south-facing shorelines.

## Tide Progression (La Jolla gauge reference)

| Date | Predicted High Tide | Time |
|---|---|---|
| Sat Sep 5 | 6.0 ft | 4:48 p.m. |
| Sun Sep 6 | 6.3 ft | 6:03 p.m. |
| Mon Sep 7 | 6.7 ft | 7:03 p.m. |
| Tue Sep 8 | **6.8 ft** | 7:54 p.m. |

Newport Beach Tuesday high tide is forecast at **7.0 ft at 7:59 p.m.**, per the Sept. 7 NWS reissue. Some SoCal locations may exceed 7 ft by Monday, per prior MyNewsLA reporting.

## Known Vulnerabilities

A **partially collapsed seawall** at a Laguna Beach oceanfront home, reported Sept. 3 ahead of the swell, remains the only confirmed structural vulnerability publicly documented on the OC coast. **San Clemente**, already dealing with a sand-starved shoreline, updated its coastal management strategy in advance of the event, per OC Register reporting. The San Clemente LOSSAN rail segment is confirmed closed and subject to ongoing tidal-height-dependent delay risk through Thursday.

## Advisory Background

[NWS San Diego](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4a0ebab1be3650aec74175c248508ef2613d3e68.001.2) first issued both advisories Sept. 3 at 1:32 p.m. and reissued them Sept. 5 at 2:10 p.m. and again Sept. 7 at 8:40 p.m. PDT with no change to the end time. The [Sept. 7 reissue](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d370ee0e69e3d96b28d2662955c7cb4778cfcc3f.001.1) updated wave heights and added the Newport Beach 7.0 ft Tuesday tide figure.

## What to Watch

The advisory expires at 11 p.m. Tuesday. The **highest tidal flood risk of the entire event** arrives Tuesday evening. Monitor NWS San Diego for any post-advisory residual surf notices, and check [Metrolink](https://www.metrolinktrains.com) for OC Line delay updates near San Clemente through Thursday, Sept. 10.

## Timeline

- **2026-09-03T20:32:00Z:** NWS San Diego issues the first High Surf Advisory and Coastal Flood Advisory for Orange County coastal areas, effective 6 a.m. Saturday Sept. 5 through 11 p.m. Tuesday Sept. 8: 6–10 ft breaking waves on south-facing beaches, strong rip currents, and minor flooding of lots, parks and roads as a south swell coincides with king tides.
- **2026-09-05T13:00:00Z:** Advisories take effect at 6 a.m. Saturday. First peak high tide of the sequence: 6.0 ft at 4:48 p.m. (La Jolla reference), rising each afternoon to 6.8 ft on Tuesday.
- **2026-09-05T21:10:00Z:** NWS reissues both advisories at 2:10 p.m. Saturday with unchanged parameters; no rescues, injuries, or road closures publicly reported on the OC coast as of Saturday evening.
- **2026-09-05T22:00:00Z:** Newport Beach lifeguards log more than 170 ocean rescues by mid-afternoon Saturday, surpassing the 96 on July 4; surf tops the berm into Seal Beach's 8th and 10th Street pier lots, which the city closes through Wednesday.
- **2026-09-06T21:34:00Z:** Voice of OC reports the LOSSAN rail line through San Clemente is closed after rainfall and high surf hit the Orange County coast.
- **2026-09-07T04:00:00Z:** Newport Beach lifeguards close the weekend with 190 rescues and about 7,200 warnings; Aliso Beach lot closed by sand inundation; Laguna Beach yellow-tags part of the collapsed Giles seawall.
- **2026-09-07T10:36:00Z:** Metrolink warns that high tides near San Clemente could delay Orange County Line trains through Thursday Sept. 10 whenever a tide reaches 6 ft or higher.
- **2026-09-07T14:47:58Z:** ABC7 reports Hurricane Marie surf has battered Southern California communities, leaving coastal areas flooded from high surf.
- **2026-09-07T15:00:00Z:** Metrolink keeps the OC Line and IE-OC Line closed between Laguna Niguel/Mission Viejo and Oceanside on Monday after weekend delays over two hours; salt water reaches the San Clemente tracks at roughly 6-ft tides.
- **2026-09-08T02:25:15Z:** ABC7 reports Seal Beach residents begin cleanup after high surf flooded the boardwalk and parking lots near the pier over the weekend; residents reinforce homes Monday ahead of additional evening high tides.
- **2026-09-08T03:40:00Z:** NWS San Diego reissues both advisories at 8:40 p.m. PDT Sept. 7 through 11 p.m. Tuesday Sept. 8: updated wave parameters (4–7 ft, sets to 9 ft), minor coastal flooding at evening high tides. Newport Beach Tuesday higher high tide now forecast at 7.0 ft at 7:59 p.m.

## Primary sources

1. [Coastal Flood Advisory — San Diego County Coastal Areas; Orange County Coastal](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d370ee0e69e3d96b28d2662955c7cb4778cfcc3f.001.1) (2026-09-08T03:40:00+00:00)
2. [High Surf Advisory — San Diego County Coastal Areas; Orange County Coastal](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d370ee0e69e3d96b28d2662955c7cb4778cfcc3f.001.2) (2026-09-08T03:40:00+00:00)
3. [ABC7: Seal Beach residents begin cleanup after high surf floods boardwalk, prepare for more water](https://abc7.com/story/seal-beach-residents-begin-cleanup-high-surf-floods-boardwalk-prepare-more-water/19804382/) (2026-09-08T02:25:15+00:00)
4. [ABC7: Marie batters Southern California coast, leaving communities flooded due to high surf](https://abc7.com/story/marie-batters-southern-california-coasts-leaving-communities-flooded-due-high-surf/19800751/) (2026-09-07T14:47:58+00:00)
5. [OC Register: Metrolink warns that high tides near San Clemente could lead to delays this week](https://www.ocregister.com/2026/09/07/metrolink-warns-that-high-tides-near-san-clemente-could-lead-to-delays-this-week/) (2026-09-07T10:36:42+00:00)
6. [ABC7: High surf from Hurricane Marie floods Seal Beach, fuels dangerous rip currents](https://abc7.com/story/high-surf-hurricane-marie-floods-seal-beach-fuels-dangerous-rip-currents/19797631/) (2026-09-06T22:19:42+00:00)
7. [Voice of OC: San Clemente Rail Line Closed After Rainfall, High Surf Hit Orange County Coast](https://voiceofoc.org/2026/09/san-clemente-rail-line-closed-after-rainfall-high-surf-hit-orange-county-coast/) (2026-09-06T21:34:25+00:00)
8. [Coastal Flood Advisory — San Diego County Coastal Areas; Orange County Coastal](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4a0ebab1be3650aec74175c248508ef2613d3e68.001.1) (2026-09-05T21:10:00+00:00)
9. [High Surf Advisory — San Diego County Coastal Areas; Orange County Coastal](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4a0ebab1be3650aec74175c248508ef2613d3e68.001.2) (2026-09-05T21:10:00+00:00)
10. [OC Register: Sand-starved San Clemente updates coastal strategy](https://www.ocregister.com/2026/09/05/sand-starved-san-clemente-updates-coastal-strategy/) (2026-09-05T08:06:39+00:00)
11. [ABC7: Seawall collapse at Laguna Beach oceanfront home raises concerns ahead of weekend swell](https://abc7.com/post/seawall-collapse-laguna-beach-oceanfront-home-raises-concerns-ahead-weekend-swell/19786431/) (2026-09-04T02:56:37+00:00)
12. [High Surf Advisory — San Diego County Coastal Areas; Orange County Coastal](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4d463a71fcd94367513f4c8206d3724a3ed060e2.001.2) (2026-09-03T20:32:00+00:00)

## Factoids

- **NWS High Surf + Coastal Flood Advisory (Sep 5–8)** (source_doc) ([source](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4a0ebab1be3650aec74175c248508ef2613d3e68.001.2)): NWS San Diego first issued the advisories at 1:32 p.m. Sep 3 and reissued them through Sep 5 (latest 2:10 p.m. Sep 5): High Surf Advisory and Coastal Flood Advisory for Orange County coastal areas from 6 a.m. Saturday Sep 5 to 11 p.m. Tuesday Sep 8, 2026. Breaking waves 6–10 ft on south/southwest-facing beaches, 4–7 ft on west-facing; strong rip and longshore currents; minor coastal flooding of lots, parks and roads with isolated road closures expected; beach erosion. Predicted high tides (La Jolla reference): 6.0 ft 4:48 p.m. Sat, 6.3 ft 6:03 p.m. Sun, 6.7 ft 7:03 p.m. Mon, 6.8 ft 7:54 p.m. Tue.
- **Driver is Hurricane Marie swell plus high astronomical tides, not winter king tides** (definition) ([source](https://mynewsla.com/orange-county/2026/09/05/dangerous-surf-expected-as-hurricane-marie-sends-swell-toward-socal-3/)): The Sept. 5–8 advisories are driven by a long-period south swell from Hurricane Marie well offshore arriving on top of elevated astronomical tides; 'king tides' in Southern California usually refers to the winter perigean spring tides, so the label is informal here. NWS San Diego's Sept. 5 surf-zone forecast put OC surf at 5–8 ft with a high rip-current risk and Newport Beach high tides at 5.8 ft (6:09 p.m. Sat) and 6.2 ft (7:08 p.m. Mon); La Jolla reference tides run 6.0 to 6.8 ft through Tuesday, and MyNewsLA reported some SoCal locations exceeding 7 ft by Monday. As of Sept. 5 no OC drowning, major beach closure or confirmed street flooding had been reported; ABC7 noted a partially collapsed seawall at a Laguna Beach oceanfront home (Sept. 3) and a busy rescue weekend over Labor Day (Sept. 1).
- **Advisory extended through Tuesday Sept. 8** (source_doc) ([source](https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d370ee0e69e3d96b28d2662955c7cb4778cfcc3f.001.1)): NWS San Diego reissued the Coastal Flood Advisory and High Surf Advisory at 8:40 PM PDT Sept. 7, in effect through 11 PM PDT Tuesday Sept. 8: breaking waves 4–7 ft with sets to 9 ft, strong rip and longshore currents, and minor coastal flooding of lots, parks and roads at evening high tides. Predicted higher high tide at Newport Beach: 7.0 ft at 7:59 PM Tuesday.
- **Seal Beach flooding and San Clemente rail closure** (source_doc) ([source](https://voiceofoc.org/2026/09/san-clemente-rail-line-closed-after-rainfall-high-surf-hit-orange-county-coast/)): Surf from Hurricane Marie washed over berms and flooded parking lots and the boardwalk near the Seal Beach Pier over the Sept. 5–7 weekend; residents cleared debris and reinforced homes Monday Sept. 7 ahead of another round of evening high tides (ABC7). Voice of OC reported Sept. 6 that the LOSSAN rail line through San Clemente was closed after rainfall and high surf hit the coast. Metrolink warned Sept. 7 that Orange County Line trains near San Clemente could see delays through Thursday Sept. 10 whenever a high tide reaches 6 ft or higher (OC Register).
- **Newport Beach rescues and Seal Beach lot closures (Sept. 6)** (source_doc) ([source](https://www.ocregister.com/2026/09/06/dangerous-surf-expected-as-rain-related-to-hurricane-marie-pelts-southern-california/)): Newport Beach spokeswoman Georgia Rios told the OC Register that lifeguards had made more than 170 ocean rescues by mid-afternoon Saturday Sept. 5 (versus 96 on July 4) plus more than 5,000 preventive actions; the city reinforced berms at Balboa Pier and The Wedge. In Seal Beach, surf pushed over the berm into the 8th Street and 10th Street parking lots near the pier, bystanders pushed out a trapped car, and the city closed both lots through Wednesday Sept. 9 while crews pumped water and rebuilt berms (ABC7).
- **Metrolink suspends OC coastal service Monday Sept. 7** (source_doc) ([source](https://www.ocregister.com/2026/09/07/metrolink-warns-that-high-tides-near-san-clemente-could-lead-to-delays-this-week/)): Metrolink kept the Orange County and Inland Empire–OC lines closed between Laguna Niguel/Mission Viejo and Oceanside on Monday Sept. 7 after weekend delays of more than two hours. Spokeswoman Sabrina Davis said salt water reaches the San Clemente tracks when tides hit about 6 feet; crews did emergency boulder placement along the coastal right-of-way. Metrolink flagged high-tide risk through Thursday Sept. 10.
- **Weekend totals: 190 Newport rescues, Aliso lot closed, Laguna seawall tagged** (source_doc) ([source](https://www.cbsnews.com/losangeles/news/high-surf-hurricane-marie-waves/)): Newport Beach Battalion Chief Adam Yacenda told CBS LA lifeguards made 190 rescues and issued about 7,200 warnings over the Sept. 5–6 weekend, versus 96 rescues on July 4. Sand inundation closed the Aliso Beach parking lot in Laguna Beach, and Laguna Beach building inspectors yellow-tagged part of the Giles family seawall and patio that had partially collapsed before the swell arrived. A Newport Beach lifeguard rescued a surfer swept over a jetty (Fox Weather, Sept. 7).

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