National Weather Service issues La Niña Watch: Here's what it means for the Bay Area

SAN FRANCISCO (KGO) -- The National Weather Service's Climate Prediction Center just released its latest advisory, and we are now on La Niña Watch.

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La Niña is when ocean waters off the coast of South America in the Pacific are cooler than average. La Niña typically sends the jet stream, a fast-moving current of air thousands of feet in the atmosphere, which acts as a highway for storms far north over the Pacific Northwest.

While no two La Niña winters are exactly the same, odds are this will bring average to below average rainfall across the Bay Area this winter.