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Satellite view of the bomb cyclone swirling off the coast of the Pacific Northwest and the atmospheric river affecting California on Oct. 24. Photo: CIRA/RAMMB

A series of powerful "atmospheric river" storms are delivering historic amounts of rainfall across parts of drought-stricken California and the Pacific Northwest.

Why it matters: The atmospheric river, packing large amounts of moisture, was causing Northern California to whiplash from drought to flood, as it slowly moved south overnight. It's triggered widespread power outages, flooding and mudslides.

A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.
  • The storm system claimed the lives of two people in Washington state after a tree fell on a vehicle amid powerful winds Sunday.

Threat level: The storm is associated with a record-strong "bomb cyclone" off the Pacific Northwest, which was forecast to remain at sea. But it's bringing wind gusts of up to 60-70 mph and greater than 40-foot waves off the coasts of northern California, Oregon, Washington and British Columbia.

  • A bomb cyclone refers to a non-tropical storm whose pressure drops at least 24mb in 24 hrs. This one more than doubled that rate, and is likely to become the strongest low-pressure area on record off the coast of the Pacific Northwest.
  • Widespread flooding was reported in the San Francisco Bay area amid potentially record rainfall.
  • The atmospheric river in this region was elevated to a Category 5 — the highest level on a scale based on strength and duration, per the Center for Western Weather and Water Extremes at Scripps Institution of Oceanography.
A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.

By the numbers: Over 116,000 customers had lost power in California and 72,000 others in Washington state were also without electricity early Monday, according to utility tracking site poweroutage.us.

The big picture: The storm was hitting with historic intensity, dumping 8-10 inches of rain across the region Sunday — and has already triggered potentially life-threatening flash floods and mudslides near the Dixie Fire and Calder Fire burn scars, per the National Weather Service.

  • Other burn areas during the devastating fire seasons from 2018 to 2021 were also under flash flood warning.
  • Evacuation orders were announced for the Santa Cruz Mountains ahead of the storm's expected arrival early Monday amid concerns the rain could cause debris flows in the CZU Lightning Complex Fire burn scar.
  • Tho NWS warned residents near burn scars in Sacramento to be prepared to evacuate if ordered to do so, noting that in some areas it may be too late for evacuation and residents should shelter in the highest parts of their homes.
  • California's Department of Transportation said mudslides in Colusa and Yolo counties caused state highways 16 and 20 to close.

Of note: Sacramento, which just experienced its longest dry spell ever recorded, after breaking a record set in 1880, saw 5.44 inches of rainfall by Sunday evening.

  • This broke the all-time record for the city's highest 24-hour rainfall total, the NWS Sacramento office noted in a statement.

Reno, Nev., meanwhile, set a new October rainfall record, with 2.82 inches of rainfall by 5 a.m. PDT Monday. That includes 2.59 inches of rain that fell in the past 24 hours, according to NWS Reno.

  • The previous October record was set in 2010 when 2.65 inches of rain fell in the city.
  • "The rain hasn't ended!" NWS Reno tweeted Monday.
A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.

Between the lines: That turnaround marks an example of the extremes that are known to buffet California, with precipitation going from "feast to famine" and back again — except the odds are stacked even further in favor of extremes now with climate change

Yes, but: The extreme rainfall won't be enough to end the drought for most places, though it will help.

  • Not all of California was forecast to be hit by this rainfall, and fire season was set to continue in the south part of the state.

Editor's note: This article has been updated with new details throughout.

Go deeper

Record-breaking 2021 Atlantic hurricane season ends

The remnants of a destroyed home are seen in the wake of Hurricane Ida on Sept. 3 in Grand Isle, La. Photo: Sean Rayford/Getty Images

The 2021 Atlantic hurricane season officially ended Tuesday, going down in history as the first time that two consecutive seasons have exhausted the list of 21 English storm names.

The big picture: Above-average sea surface temperatures led to fierce storms that left their mark on the Gulf Coast as well as mid-Atlantic, when Category 4 Hurricane Ida swept ashore in coastal Louisiana on Aug. 29 and went on to kill more than two dozen people in the mid-Atlantic.

Updated 4 hours ago - Politics & Policy

Prosecutors charge parents of Michigan school shooting suspect

Photo: Scott Olson/Getty Images

The parents of a 15-year-old accused of killing four students and wounding seven other people at a Michigan high school have been charged with four counts of involuntary manslaughter, according to court documents.

The latest: Lawyers for James and Jennifer Crumbley told the Detroit News they are "returning to the area to be arraigned," after law enforcement officials announced a search for the Crumbleys had been initiated.

Updated 8 hours ago - Politics & Policy

Omicron dashboard

Illustration: Shoshana Gordon/Axios

  1. Health: Coronavirus variant surveillance varies widely by state — Omicron cases confirmed in 5 U.S. states America probably won't lead the effort to understand Omicron.
  2. Vaccines: Omicron adds urgency to vaccinating world — Omicron fuels the case for COVID boosters — Moderna loses patent battles tied to COVID vaccine.
  3. Politics: Nevada to impose insurance surcharge on unvaccinated state workers — New Jersey GOP lawmakers defy statehouse COVID policy — Oklahoma sues Biden administration over Pentagon vaccine mandate — Omicron travel bans are sign of what's to come.
  4. World: WHO: Delta health measures help fight Omicron — COVID cases surge in South Africa in sign Omicron wave is coming — Germany approves new restrictions for unvaccinated people.
  5. Variant tracker: Where different strains are spreading.