Scientists are warning that California is overdue for a catastrophic “biblical megaflood” capable of transforming vast areas of the state into a massive inland sea and forcing millions of Americans to flee their homes.

The nightmare scenario, known as ARkStorm 2.0, envisions a relentless barrage of powerful storms striking California for roughly a month, unleashing flooding on a scale not seen since the Great Flood of 1861-62.

Researchers say the event could strike during any winter.

If it does, the devastation could exceed $1 trillion, making it one of the most expensive natural disasters in history.

Some communities could disappear beneath 20 feet of floodwater, while heavily populated regions stretching from San Francisco to Los Angeles would face widespread destruction.

Scientists Say State Is Overdue for Historic Megaflood

The warning centers on an event scientists call an Atmospheric River 1,000-year Storm, or ARkStorm.

The scenario was developed by the U.S. Geological Survey alongside federal, state, and academic researchers to model a realistic worst-case flood event.

Unlike a single storm, ARkStorm envisions a continuous chain of atmospheric rivers slamming into California over approximately 30 days.

Atmospheric rivers are narrow corridors of tropical moisture capable of transporting astonishing amounts of water across the Pacific.

When they collide with California’s coastal mountains and the Sierra Nevada, they release torrential rain and heavy snowfall.

Under the ARkStorm scenario, those systems would repeatedly hammer the state until rivers overflow, levees fail, and entire communities are submerged.

Floodwaters Could Swallow Vast Areas of California

Researchers warn that California’s Central Valley would bear the brunt of the catastrophe.

Floodwaters would surge through the Sacramento and San Joaquin river systems before spreading across one of America’s most productive agricultural regions.

Entire towns could disappear beneath the water.

The scenario projects flooding of up to 20 feet in some communities.

More than 1.5 million people could be forced to evacuate.

Nearly one-quarter of all buildings in California could sustain flood damage.

Power failures, transportation shutdowns, landslides, and infrastructure failures would ripple across every county in the state.

Scientists: ‘It Was Always a When, Not If’

Dr. Daniel Swain, a UCLA scientist who co-authored the ARkStorm 2.0 study, says the threat has become increasingly difficult to ignore.

“It was always a when, not if,” Swain told BBC Science Focus.

Swain said he once believed such a disaster might be centuries away.

“Now, it’s quite likely to be within my own lifetime,” he warned.

Researchers cannot predict exactly when the megaflood will occur.

Statistically, they say, it could happen this winter—or decades from now.

California Has Already Experienced One Before

The scenario is modeled in part on California’s Great Flood of 1861-62.

During that disaster, storms battered the state for approximately 45 days.

The Central Valley became an inland lake stretching nearly 300 miles.

Entire towns, farms, and transportation routes vanished beneath the floodwaters.

Sacramento was so badly affected that California temporarily moved its state capital to San Francisco.

Researchers say geological evidence shows that at least six even larger megafloods have struck California during the past 1,800 years.

Warmer Atmosphere Could Supercharge Future Storms

Scientists say today’s climate would likely make a future ARkStorm even more destructive.

Swain describes the atmosphere as functioning like an expanding sponge.

“You can essentially just imagine an ordinary kitchen sponge that grows progressively larger,” he said.

“It has the capacity to absorb much more water.”

When that moisture is released over California, rainfall becomes dramatically more intense.

At the same time, warming temperatures cause more winter precipitation to fall as rain instead of snow.

Rain falling onto existing mountain snowpack can rapidly melt it, sending enormous volumes of additional water rushing downstream.

Swain described the combination as a “double whammy.”

Researchers estimate runoff in parts of the southern Sierra Nevada could increase by 200% to 400% compared to historical megastorms.

Flood Defenses May Not Be Enough

California has spent decades constructing levees, canals, reservoirs, and pumping systems designed to protect the Central Valley.

But many of those defenses were not designed for biblical flooding.

The U.S. Geological Survey warns they were never designed to withstand the volume of water projected under an ARkStorm.

Millions of homeowners could also discover they lack sufficient flood insurance to rebuild.

Officials are investing up to $30 billion over 30 years through California’s Central Valley Flood Protection Plan to strengthen levees, restore floodplains, and improve emergency planning.

They are also developing high-resolution flood maps to better predict how water would move through communities.

Experts Warn California Still Isn’t Ready

Despite those efforts, scientists say preparations remain dangerously inadequate.

“There’s a lot more that needs to be done. We are not prepared,” said Dr. Christine Albano of the Desert Research Institute.

Unlike earthquakes, megastorms provide some warning.

Meteorologists could detect the developing storm sequence days, or even weeks, before the worst flooding begins.

That advance notice could provide critical time for evacuations and emergency preparations.

But experts warn that preparation today will determine whether a future ARkStorm becomes a natural disaster, or one of the worst humanitarian catastrophes in American history.

“Statistically, it could happen this year, or it might not happen for 70 years, if we get lucky,” Swain said.

Source: https://slaynews.com/scientists-warn-biblical-megaflood-risk-threatens-millions-california/

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