01:28 - Source: CNN
See the mud caked over on a major freeway in California
CNN  — 

Monterey Peninsula residents could soon be living on an island as mammoth flooding threatens to cut them off from the rest of California.

The state has been hammered by a cascade of atmospheric rivers – long, narrow regions in the atmosphere that can carry moisture thousands of miles.

At least 18 people have died, neighborhoods have turned into lakes, and countless homes have been destroyed as a string of storms toppled trees and paralyzed communities over the past two weeks.

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The Salinas River, which opens into Monterey Bay, floods Wednesday.

But a sliver of good news emerged Thursday: The nearly relentless rainfall has lifted much of California out of “extreme drought” conditions.

And many walloped communities are getting a brief respite from brutal weather Thursday. But cities are still inundated – and more storms are on the way.

‘Monterey Peninsula may become an island’

Shmuel Thaler/The Santa Cruz Sentinel/AP
Waves in Monterey Bay battered the storm-damaged Capitola Wharf on Tuesday.

Just south of the San Francisco Bay Area, cities including Monterey, Carmel and Pacific Grove on the Monterey Peninsula could soon be severed from the rest of California due to epic floodwater.

“If anyone was here in 1995, you know that during a large flooding event, the Monterey Peninsula became an island – people were either stuck on one side or the other,” Monterey County Sheriff Tina Nieto warned Wednesday evening.

“And we anticipate that we’re going to go into a similar situation, but not as bad. Some of the roadways are going to be closed, and you could be stuck on one side or the other.”

The sheriff’s office upgraded evacuation warnings to evacuation orders Wednesday in low-lying areas near the Salinas River.

“Monterey Peninsula may become an island again like it did in the ’95 floods, so please start preparing now,” the sheriff warned.

Nieto said it could be days before residents are allowed to return home, as crews need to make sure the area is safe.

More ferocious weather will slam the West Coast

According to the Storm Prediction Center, here’s what’s in store for California as another round of storms heads its way:

Thursday: Heavy rain will be confined along the northern California coast and into Oregon and Washington through Thursday night, with a slight risk of excessive rainfall in effect for northwestern California.

View this interactive content on CNN.com


Friday: An atmospheric river will likely pummel the northern California and central California coast on Friday. Winter storm watches will likely begin across the Sierra Nevada.

Heavy snowfall could lead to dangerous mountain travel conditions Friday and Saturday at elevations over 5,000 feet and in the northern and central California passes.


Saturday: A second system will move in on Saturday, and rainfall will spread south and begin to impact the whole state. Excessive rainfall threats will likely be issued for central California.

Officials urge residents to stay off roads

Jose Carlos Fajardo/East Bay Times/Getty Images
Ryan Orosco carries his 7-year-old son, Johnny, on his back while his wife, Amanda, waits at the front porch to be rescued from their flooded home in Brentwood, California, on Monday, January 16.
Mike Blake/Reuters
An abandoned car is trapped on a flooded street in San Diego on January 16.
Daniel Dreifuss.Reuters
Joey Klien salvages items from his house on January 16 after part of it was flooded in Carmel Valley.
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Damage caused by recent storms is seen at the Capitola Pier on Sunday, January 15. The pier was built in 1857.
David Swanson/Reuters
Melissa Foley clears debris in her neighborhood as the San Lorenzo River rises in Felton on Saturday, January 14.
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A flooded field is seen in Salinas as the Salinas River begins to overflow its banks on Friday, January 13.
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National Guard troops, sheriff's office personnel and firefighters search for missing 5-year-old Kyle Doan near San Miguel on Thursday, January 12. Doan was pulled from his mother's hands by rushing floodwaters on January 9.
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Kelly Slate packs a mirror in the back of a truck after her home was flooded in Planada on Wednesday, January 11.
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A car drives through floodwaters in Planada on January 11.
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Residents in Piru work to push back wet mud that trapped cars and invaded some houses on January 11.
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A person walks near driftwood and storm debris that washed up in front of the Santa Cruz Beach Boardwalk amusement park.
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A San Diego firefighter rescues a dog from a flooded home in Merced on Tuesday, January 10.
Noah Berger/AP
Pauline Torres carries belongings from her flooded home in Merced on January 10.
Josh Edelson/AFP/Getty Images
A neighborhood is flooded in Merced.
Nic Coury/AP
Matt O'Brien shovels mud from a driveway on January 10 after the San Lorenzo River overflowed in Felton.
David Swanson/Reuters
Several people had to be rescued after two vehicles fell into this sinkhole in Chatsworth on January 10.
Genaro Molina/Los Angeles Times/Getty Images
Commuters in downtown Los Angeles are shuttled over a flooded section of a pedestrian walkway leading to train platforms on the main level of Union Station.
Melina Mara/The Washington Post via Getty Images
Cleanup takes place in Aptos on January 9 after streets and homes were flooded near the Rio Del Mar State Beach.
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People arrive at an evacuation center in Santa Barbara on January 9.
Allen J. Schaben/Los Angeles Times via Getty Images
A crew member is reflected in pools of water while setting up the red carpet for the Golden Globe Awards in Los Angeles.
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A home is flooded in Gilroy on January 9.
Brontë Wittpenn/San Francisco Chronicle via AP
Colleen Kumada-McGowan stands in floodwaters in front of her home in Watsonville on January 9.
Carlos Avila Gonzalez/San Francisco Chronicle via AP
Crews work to clear a mudslide on Highway 17 in Scotts Valley.
Nic Coury/AP
Naia Skogerson leaves her home in Aptos.
Neal Waters/Anadolu Agency via Getty Images
A road is damaged in Scotts Valley on January 9.
Fred Greaves/Reuters
This aerial photo shows a tree that fell in Sacramento on January 8.
Mike Kai Chen/The New York Times/Redux
Santa Cruz residents clear storm debris and stack sandbags near their homes on January 7.
Mike Kai Chen/The New York Times/Redux
Sandbages are piled in front of a door in Capitola on January 6.
Shmuel Thaler/The Santa Cruz Sentinel via AP
Boone White leaps from his car after a large tree fell on it while he was driving near Capitola.
Shmuel Thaler/The Santa Cruz Sentinel via AP
A support piece from the Capitola Wharf is seen inside the storm-damaged restaurant Zelda's on the Beach.
Karl Mondon/Bay Area News Group via AP
Evan Sousa, left, gets help from Calvin Drake as they push water out of his flooded apartment in Pacifica on January 5.
Max Whittaker/The New York Times/Redux
Henry Valletta cuts up a downed tree in Sacramento on January 5.
Carlos Barria/Reuters
Residents walk in a damaged area of Aptos on January 5.
Nic Coury/AP
Dominic King, owner of the restaurant My Thai Beach, surveys storm damage at his business in Capitola.
Max Whittaker/The New York Times/Redux
A vineyard is flooded in Walnut Grove on January 4.
Josh Edelson/AFP/Getty Images
Drivers in San Francisco barrel into standing water on Interstate 101 on January 4.
Mike Kai Chen/The New York Times/Redux
Khaled Dajani clears water from his flooded living room in San Francisco on December 31.

The recent storms have crippled travel and left dozens of highways inoperable.

At least 40 state routes were closed as of Wednesday night, state transportation spokesman Will Arnold said.

“We’re asking the public: If you don’t need to be on the roadways, please stay home and avoid any non-essential trips,” Arnold said.

Meanwhile, more than 200 rescue personnel were searching for missing 5-year-old Kyle Doan Thursday after he was swept away from a vehicle surrounded by floodwater on Monday in San Luis Obispo County.

Dive teams swam through a creek while search teams on the shore identified and marked brush piles, where authorities believe the boy may be. More than 100 members of the California National Guard sifted through the piles looking for Doan. Firefighters and other personnel were also digging in areas covered by mud and debris left by the storm.

“This is a technically challenging search,” said Chief Deputy Nate Paul with the San Luis Obispo County Sheriff’s Office.

Drought conditions improve, but still exist

Less than 1% of California is now under “extreme drought” – down from one-third of the state just two weeks ago, according to the latest US Drought Monitor report published Thursday.

“Intense precipitation in California the past few weeks – particularly late December and early January – has significantly reduced drought intensity in California,” according to the US Drought Monitor.

In 16 days, swaths of California received 50% to 70% of the amount of precipitation that they would usually get in a whole year, according to the National Weather Service.

Isolated areas, especially in the mountains near Santa Barbara, have recorded more than 90% of their annual precipitation.

But more than 95% of California is still under some type of drought designation.

View this interactive content on CNN.com

Large portions of the state remain in “moderate” or “severe” drought “since moisture deficits have been entrenched across some areas for the last 2-3 years,” the drought summary said.

The recent rains have “provided a generous boost” to key reservoirs in the state, but most are still below the long-term average for this time of the year.

CNN’s Joe Sutton, Brandon Miller, Taylor Ward and Robert Shackelford contributed to this report.