90-day weather outlook based on strong La Niña

The 90-day outlook from the Climate Prediction Center is based on La Niña conditions bringing below-normal temperatures and above-average snow and rain to the Northwest, warm and dry conditions to the Southwest and South.

Northern Colorado in an area where the weather service is calling for equal chances of either above or below-normal temps and precipitation

By Summit Voice

SUMMIT COUNTY — Issuing 30- and 90-day outlooks, the National Weather Service Friday said that La Niña strengthened in August and September, bringing well below normal sea surface temperatures in the central equatorial Pacific Ocean and influencing global atmospheric circulation.

The temperature outlook for October is for increased chances of below-normal temperatures for parts of the northwest and for the entire West Coast in general.

Chances are increasing for above-average temperatures in parts of the Southwest and the southern Rockies across the Great Plains to the Great Lakes region and New England.
An increased chance of above-average October precipitation is forecast for the northwest, Montana, parts of Wyoming, the Dakotas and western Minnesota, as well as for the Gulf Coast and Atlantic Coast states.

Below-average precipitation is favored from California across the Southwest to the Southern Rockies to the Great Lakes, the middle Mississippe Valley and sections of the Ohio Valley and Tennessee.

In the 90-day outlook, the National Weather Service said La Niña increases the chances for above average temperatures from the Southwest into west Texas and much of the eastern U.S. except in the Southeast.

Lower than average temperatures can be expected along the West Coast because of the persistence of below-average sea surface temperatures in the Pacific. Below average temperatures can also be expected in Alaska, the Pacific Northwest, the northern Rockies and extending eastward into the northern Plains and the western Great Lakes.

Those same areas will generally see increased chances for above-normal precipitation.
La Niña enhances chances for above-normal temps and below average precipitation across large portions of the southern U.S.


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