La Niña Is Back for Another Round

This might be the winter of deja pow: La Niña is back, officials announced this week. The same weather pattern the brought last season’s early dumps is forming again in the Pacific Ocean. It’s not uncommon — La Niñas occur back to back about half the time. What’s that mean? Well, if you’ve already forgotten last winter’s blower, it generally means deeps in the north and nada in the south. Let the skid migration begin.

Here’s the official word from Uncle Sam the Weather Man:

La Niña, which contributed to extreme weather around the globe during the first half of 2011, has re-emerged in the tropical Pacific Ocean and is forecast to gradually strengthen and continue into winter. Today, forecasters with NOAA’s Climate Prediction Center upgraded last month’s La Niña Watch to a La Niña Advisory.

NOAA will issue its official winter outlook in mid-October, but La Niña winters often see drier than normal conditions across the southern tier of the United States and wetter than normal conditions in the Pacific Northwest and Ohio Valley.

“This means drought is likely to continue in the drought-stricken states of Texas, Oklahoma and New Mexico,” said Mike Halpert, deputy director of the Climate Prediction Center. “La Niña also often brings colder winters to the Pacific Northwest and the northern Plains, and warmer temperatures to the southern states.”

Climate forecasts from NOAA’s National Weather Service give American communities advance notice of what to expect in the coming months so they can prepare for potential impacts. This service is helping the country to become a Weather Ready Nation at a time when extreme weather is on the rise.

Seasonal hurricane forecasters factored the potential return of La Niña into NOAA’s updated 2011 Atlantic hurricane season outlook, issued in August, which called for an active hurricane season. With the development of tropical storm Nate this week, the number of tropical cyclones entered the predicted range of 14-19 named storms.

The strong 2010-11 La Niña contributed to record winter snowfall, spring flooding and drought across the United States, as well as other extreme weather events throughout the world, such as heavy rain in Australia and an extremely dry equatorial eastern Africa.

La Niña is a naturally occurring climate phenomenon located over the tropical Pacific Ocean and results from interactions between the ocean surface and the atmosphere. During La Niña, cooler-than-average Pacific Ocean temperatures influence global weather patterns. La Niña typically occurs every three-to-five years, and back-to-back episodes occur about 50 percent of the time. Current conditions reflect a re-development of the June 2010-May 2011 La Niña episode.

{ 2 comments…read them below or write one }

  • phat-pat

    Wait? First it snowed a shit ton-then some number showed it DIDN’T. Now some numbers show it’s going Dump/Not Dump next year again? Are you by chance in Real Estate?

  • Alex

    The climate is kind of a tricky thing, believe it or not. You look for two things in ENSO (El Nino Southern Oscillation): ocean temperatures and atmospheric circulations. Earlier in the year the sea surface temperatures were about average, meaning a neutral season, but the atmosphere showed hints of La Nina. That was months ago, now they’re both hinting towards La Nina. The general resulting climate of La Nina/El Nino has been studied and you can find it on NCDC’s site. So we can sooort of guess that this winter will be similar to last years, but like I said it’s a chaotic system so of course it won’t be exactly like last year.

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