La Niña typically means dry conditions across the southern U.S. and more hurricanes in the Caribbean
The National Interagency Fire Center’s outlook for Southern California sees an expected transition to a La Niña episode adding drier-than-average conditions just as October arrives, bringing the start of the fall wind season.may be more frequent, the NIFC outlook said, raising concern because of “the heavy loading of fine fuels” such as grasses and brush.In California, rainfall can be enhanced by an El Niño and suppressed by a La Niña.
La Niña formation typically affects the hurricane seasons, not only in the Pacific, but in the tropical Atlantic as well. The Atlantic has been in the warm or positive high-activity phase of the Atlantic Multi-decadal Oscillation since 1995. So continued ENSO-neutral conditions in the Pacific or a La Niña would mean either no suppression of, or reinforcement of, that high-activity inclination.
Meanwhile, in the western Pacific, La Niña can cause heavy, flooding rains in places such as Indonesia and northern Australia.What causes La Niña? During a La Niña, the tropical trade winds are much stronger than under normal conditions, and they promote more upwelling of cold water from the deep off the west coast of South America and along the equator. The strong winds also push warm equatorial ocean surface water to the west.
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