Flood · 2023

California Atmospheric River Series 2023

December 2022 – March 2023 (9 consecutive Atmospheric Rivers) · CA

$4.6 billion (state estimate)

Total Damage

50,000+

Homes Flooded

$1.8 billion

Insured Losses

$300 million

FEMA Grants

What Happened

Nine consecutive Atmospheric River events struck California from December 2022 through March 2023, ending California's multi-year drought in catastrophic fashion. Hardened drought soils could not absorb water — runoff rates exceeded storm drain capacity across major urban areas. The Sacramento region came within weeks of levee failures. Montecito was hit by debris flows. San Francisco received 200% of normal annual rainfall in 90 days.

Rainfall Record

40–70 inches in parts of Sierra Nevada; 10–20 inches across urban California in record time

Affected Cities & States

States

Primary Cities

Los Angeles
San Francisco
Sacramento
San Jose
Santa Cruz

Key Lessons for Homeowners

1
California went from historic drought to historic flood within weeks — the whiplash cycle is accelerating
2
Private home insurers were withdrawing from California while these events were occurring — insurer availability crisis
3
Drought-hardened soils behave like concrete during extreme rainfall — dry years followed by wet years = extreme flood risk
4
Mountain communities faced combined flood + landslide risk when burned Atmospheric Rivers struck

Damage & Recovery by the Numbers

Total Economic Damage: $4.6 billion (state estimate)
Insured Losses: $1.8 billion
Homes Flooded: 50,000+
FEMA Grants Issued: $300 million
FEMA Declaration #: DR-4699

Official Resources

FEMA Declaration Number: DR-4699

Apply for federal disaster assistance at DisasterAssistance.gov — use declaration number above to look up your eligibility.

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Related Resources

Other Major Events

California Atmospheric River Series 2023 — Frequently Asked Questions

: California Atmospheric River Series 2023 (2023) caused $4.6 billion (state estimate) in total damages, with $1.8 billion in insured losses. Approximately 50,000+ homes were flooded. FEMA issued $300 million in individual assistance grants to affected homeowners.
: Key lessons from California Atmospheric River Series 2023: California went from historic drought to historic flood within weeks — the whiplash cycle is accelerating; Private home insurers were withdrawing from California while these events were occurring — insurer availability crisis; Drought-hardened soils behave like concrete during extreme rainfall — dry years followed by wet years = extreme flood risk; Mountain communities faced combined flood + landslide risk when burned Atmospheric Rivers struck.
: Standard homeowners insurance does NOT cover flood damage from events like California Atmospheric River Series 2023. This type of damage — surface water flooding from river flooding and storm runoff — requires separate NFIP (National Flood Insurance Program) or private flood insurance. FEMA disaster assistance (average $300 million per event) provides limited supplemental help for uninsured losses, but is far below typical replacement costs.
: Apply at DisasterAssistance.gov or call 1-800-621-3362 within 60 days of the federal disaster declaration for your county. You will need your Social Security number, property address, insurance policy information, and a description of damages. FEMA will schedule a home inspection. Processing typically takes 1-2 weeks for initial determination. If denied, you have 60 days to appeal with additional documentation.

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What Happened

Rainfall Record

40–70 inches in parts of Sierra Nevada; 10–20 inches across urban California in record time

Key Lessons for Homeowners

California went from historic drought to historic flood within weeks — the whiplash cycle is accelerating

Private home insurers were withdrawing from California while these events were occurring — insurer availability crisis

Drought-hardened soils behave like concrete during extreme rainfall — dry years followed by wet years = extreme flood risk

Mountain communities faced combined flood + landslide risk when burned Atmospheric Rivers struck

California Atmospheric River Series 2023 — Frequently Asked Questions

California Atmospheric River Series 2023 (2023) caused $4.6 billion (state estimate) in total damages, with $1.8 billion in insured losses. Approximately 50,000+ homes were flooded. FEMA issued $300 million in individual assistance grants to affected homeowners.

Key lessons from California Atmospheric River Series 2023: California went from historic drought to historic flood within weeks — the whiplash cycle is accelerating; Private home insurers were withdrawing from California while these events were occurring — insurer availability crisis; Drought-hardened soils behave like concrete during extreme rainfall — dry years followed by wet years = extreme flood risk; Mountain communities faced combined flood + landslide risk when burned Atmospheric Rivers struck.

Standard homeowners insurance does NOT cover flood damage from events like California Atmospheric River Series 2023. This type of damage — surface water flooding from river flooding and storm runoff — requires separate NFIP (National Flood Insurance Program) or private flood insurance. FEMA disaster assistance (average $300 million per event) provides limited supplemental help for uninsured losses, but is far below typical replacement costs.

Apply at DisasterAssistance.gov or call 1-800-621-3362 within 60 days of the federal disaster declaration for your county. You will need your Social Security number, property address, insurance policy information, and a description of damages. FEMA will schedule a home inspection. Processing typically takes 1-2 weeks for initial determination. If denied, you have 60 days to appeal with additional documentation.