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ARkStorm Threatens California Winter

California faces heightened flood risk this winter due to El Niño and atmospheric rivers.

Nov 3, 2026

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ARkStorm Threatens California Winter

California faces heightened flood risk this winter due to El Niño and atmospheric rivers.

In brief

California faces heightened flood risk this winter due to El Niño and atmospheric rivers. An ARkStorm could cause $725 billion in damage and 1.5 million evacuations in California this winter. Originally reported by Newsweek.

Quick answers

What Is An ARkStorm?
ARkStorm is a hypothetical disaster scenario for extreme flooding in california.
What is the key takeaway from ARkStorm Threatens California Winter?
An ARkStorm could cause $725 billion in damage and 1.5 million evacuations in California this winter.

What Is An ARkStorm?

ARkStorm is a hypothetical disaster scenario for extreme flooding in california.

ARkStorm Probability

The scenario has a 1 in 1000 annual probability of occurring at a specific location.

USGS Damage Estimate

USGS Damage Estimate

USGS estimates $725 billion in property damage and business interruption losses.

Evacuation Impact

Approximately 1.5 million people could need to evacuate during an ARkStorm.

El Niño Influence

El niño increases wetter-than-average conditions in california this winter.

Atmospheric Rivers

Atmospheric rivers can cause intense rainfall and flash flooding in california.

Coastal Flooding Risks

In an aerial view, Pacific Ocean waves crash into damaged homes as a powerful ocean surge and very high tides generated by Tropical Storm Rachel batter the Sout

Tropical Storm Rachel damaged beachfront homes in long beach and newport beach.

The big picture

An ARkStorm could cause $725 billion in damage and 1.5 million evacuations in California this winter.

Read the original on Newsweek

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