Thanks to three consecutive wet years, Marin’s reservoirs are above average levels headed into a brewing La Niña winter, officials said.

Last month, federal forecasters said La Niña has arrived and is expected to continue through the winter. The phenomenon, which happens when Pacific Ocean waters off South America are cooler than normal, has been thought to signal a drier season, but experts say the impact in Northern California is less severe — and maybe even inconsequential — compared to southern parts of the state.

“We are observing La Niña conditions, but at this point it’s quite uncertain what that means for us,” Lucy Croy, water resources manager at the Marin Municipal Water District, said Tuesday while providing a water supply outlook to the district board. “It could mean wet, it

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