Atmospheric River Brings Snow and Flood Risks to Los Angeles and San Diego
What happened
An atmospheric river system impacted San Diego and Los Angeles on November 1, 2026. Snow showers began in the Sierra Nevada Saturday morning, leading to the closure of high-altitude passes, including Monitor Pass and Sonora Pass, by Sunday afternoon. Chain controls remained in place along Highway 88 Sunday afternoon due to snow and icy corridors.
From nypost.com
Why it matters
The weather event caused closures of high-altitude passes and maintained chain controls on major highways. Coastal conditions led to flood advisories, potentially affecting port operations and utility infrastructure in the region.
Agencies issued flood advisories and risks for Los Angeles and San Diego following coastal conditions.
From nypost.com
Who's involved
- San DiegoLocation affected by the atmospheric river system.
- Los AngelesLocation affected by the atmospheric river system.
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.
- Southern California EdisonSpeculative
Could see increased operational repair costs and infrastructure damage from storms and flooding.
- Los Angeles Department of Water and PowerSpeculative
Could face increased operational repair costs and infrastructure damage from storms and flooding.
Possible ripples
Who this could reach next, traced step by step from the reporting. Possibilities worth considering, not forecasts.- Coastal rain and high surf may disrupt Long Beach infrastructureCoastal rain and high surf may disrupt Long Beach infrastructureLikely
- Atmospheric river system may disrupt Delta Air Lines' Southern California flightsDelta Air Lines may face operational disruptions due to severe Southern California weatherLikely
- Atmospheric river could increase flood risks for San Diego CountySan Diego County may face increased flood response demands from coastal rainPossible
- San Diego City Council may face emergency policy needs after atmospheric river hitsThe City Council may need to enact emergency policies due to flood advisories and storm impacts.Possible
- Atmospheric river system may disrupt cross-border trade and labor in TijuanaTijuana may face operational disruptions due to cross-border trade and labor impacts from coastal flooding.Possible
See all 8 possible ripples
- Atmospheric river may increase flood risk for San Diego County Water AuthorityIncreased flood risk and heavy rainfall may strain the San Diego County Water Authority.Possible
- Atmospheric river system may strain Southern California Edison's infrastructureSouthern California Edison may face increased repair costs and operational strain from severe weather.Possible
- Atmospheric river system may increase operational costs for LADWPAtmospheric river system may increase operational costs for LADWPPossible
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The entities involved
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San Diego
seat of San Diego County, California, United States; second-largest city in California
- Realty Income Corporation announced its operating results from San Diego on August 7, 2025. The company noted that Europe accounted for 76% of its investment volume, led by CEO Sumit Roy.
- Michael Wayne worked for KPBS on data gathering, covering regional politics in San Diego, with Jakarta serving as a public matters reporting hub.
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Los Angeles
seat of Los Angeles County, and largest city in California, United States