- Ocean warming drives marine heatwaves in the Pacific.
- Scripps Institution of Oceanography monitors record-high ocean temperatures and reports on a marine heat wave affecting Southern California.
Coastal Flooding and Marine Heat Wave Affect Southern California Coast
What happened
Elevated tides and a marine heat wave were observed in Los Angeles and Big Sur on October 29, 2026. Coastal flooding advisories are being issued along the California coast due to the strongest tides of the year. These conditions are exacerbated by a major marine heat wave and a record El Niño, which has pushed warm water up the coast and raised sea levels. The warm water in Southern California is running 8-10 degrees Fahrenheit above normal for this time of year.
From pressdemocrat.com
Why it matters
The combination of rising ocean temperatures and elevated tides is causing coastal flooding, which is increasing sea levels. This phenomenon directly affects regional infrastructure and coastal operations across Southern California.
Scripps Institution of Oceanography monitors record-high ocean temperatures and reports on a marine heat wave affecting Southern California, a process driven by ocean warming in the Pacific.
From pressdemocrat.com
Who's involved
- Los AngelesLocation experiencing elevated tides and coastal flooding advisories.
- Big SurRegion experiencing marine heat wave and sharing environmental risks with Los Angeles.
- Monterey CountyCounty that exercises formal jurisdiction over the Big Sur region.
- Highway 1Service provider whose operational status is impacted by coastal flooding in Big Sur.
Who could feel it
Possible knock-on effectsThese are possibilities Brind reasoned out, not predictions, and not advice. Most are not stated in any report.
- Monterey CountySpeculative
Monterey County could see increased municipal costs related to infrastructure management from regional coastal flooding.
Possible ripples
Who this could reach next, traced step by step from the reporting. Possibilities worth considering, not forecasts.- Elevated tides and heat wave require NWS to issue coastal warningsThe National Weather Service must issue coastal warnings due to heat and tidesLikely
- Coastal flooding and erosion may disrupt state transportation routes along California's coastCoastal flooding and erosion may disrupt state transportation routes along California's coast.Likely
- Coastal flooding risk may disrupt Long Beach's port operationsCoastal flooding risk may disrupt Long Beach's port operations and supply chainsPossible
- Coastal flooding may threaten Highway 1's operational status in Big SurCoastal flooding may threaten Highway 1's operational status in Big Sur.Possible
- Coastal flooding may increase infrastructure needs in Monterey CountyCoastal flooding may increase infrastructure needs in Monterey CountyPossible
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The entities involved
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Los Angeles
seat of Los Angeles County, and largest city in California, United States
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Big Sur
region in Monterey County, California, United States