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Coastal Ocean Temperatures Break Records as Storm Nears Bay Area
Scientists say the unusually warm water could lift sea levels and worsen flooding when king tides and El Niño storms arrive.
On Saturday, climate scientist Daniel Swain reported an extreme El Niño has triggered a "record-shattering" marine heat wave, with 90 percent of California's coastal waters experiencing severe Category 3 to Category 5 conditions.
Hot ocean water has sloshed from the western Pacific Ocean to coastal California, causing water temperatures to run more than 10°F warmer than average, according to Swain.
Thermal expansion is forcing coastal ocean levels 6 to 12 inches above average, contributing to damaging flooding and dangerous waves reaching up to 50 feet along the coast.
Forecasters warn of 20-to-40-foot waves and potential flooding through the weekend, while Swain remains concerned about further impacts during king tide windows in late November.
The exceptional warmth is disrupting marine ecosystems; scientists recently spotted tropical species typically found in Hawaii, including winged comb jellies and rose siphonophores, in Central California waters.