{"id":10013,"date":"2010-12-21T16:42:34","date_gmt":"2010-12-22T00:42:34","guid":{"rendered":"http:\/\/blogs.kqed.org\/climatewatch\/?p=10013"},"modified":"2010-12-21T16:42:34","modified_gmt":"2010-12-22T00:42:34","slug":"so-much-for-la-nina","status":"publish","type":"post","link":"https:\/\/ww2.kqed.org\/climatewatch\/2010\/12\/21\/so-much-for-la-nina\/","title":{"rendered":"So Much for La Ni\u00f1a"},"content":{"rendered":"

Pacific ocean conditions that often portend a dry winter sure haven’t so far.<\/strong><\/p>\n

Scientists like to joke that \u201cclimate is what you expect, weather is what you get.\u201d The relatively soggy winter so far is a classic example of that.<\/p>\n

\"\"<\/a>
Satellite image from last weekend, showing storm systems marching across the Pacific toward California. (Image: NASA)<\/figcaption><\/figure>\n

A closely-watched oscillation in the Pacific is in the La Ni\u00f1a phase this winter, creating colder-than-normal surface temperatures and distorting weather patterns. Usually a La Ni\u00f1a<\/a> means drier-than-normal conditions for Southern California in particular and often for northern parts of the state as well. Not this year–at least not so far. The rain set multiple records over the weekend. Los Angeles<\/a> has had a third of its average annual rainfall in a week. So what’s going on?<\/p>\n

Kevin Trenberth<\/a>, who heads the Climate Analysis Section<\/a> at the Nat\u2019l Center for Atmospheric Research, says lately there’s a monkey wrench in the works, in the form of a “blocking anticyclone.”<\/p>\n

“In La Ni\u00f1a conditions, which is what we have now, the main storms that come into North America come barreling into Washington, Oregon and British Columbia more,” Trenberth told me in a phone interview.<\/p>\n

But lately a persistent region of high pressure in the north Pacific is diverting storms south, into California. Trenberth says: “There\u2019s a crapshoot or a random component to it, if you like, in the more northern latitudes, that\u2019s adding some extra flavor to what\u2019s going on, I think.<\/p>\n

But that doesn\u2019t mean it\u2019ll keep raining. The tap could be shut off at any time and Trenberth, for one, still thinks it’ll happen. He says this is considered a \u201cstrong\u201d La Ni\u00f1a and is still likely to wield influence over the winter as a whole. One clue is ocean temperatures in the central-to-eastern Pacific, which are running 2 degrees C (3.5 F) below normal. “That only occurs\u2014probably less than 10% of the time, so it\u2019s a relatively rare event and certainly stronger than anything we\u2019ve seen in recent years,” said Trenberth.<\/p>\n

Earlier in the season, Jet Propulsion Laboratory climatologist Bill Patzert<\/a> told the Los Angeles Times<\/em><\/a> that 82% of La Ni\u00f1as since 1949 have produced below-average rainfall.<\/p>\n

That’s more the case for the Southland. As you move north, La Ni\u00f1a’s influence on precipitation reverses itself and the Pacific Northwest gets doused. Trenberth says the transition line is right about 40 degrees north latitude. Around that line, La Ni\u00f1a’s effects become murky and things can go either way. San Francisco is at 37 degrees north and Reno is at 39.<\/p>\n","protected":false},"excerpt":{"rendered":"

Pacific ocean conditions that often portend a dry winter sure haven’t so far. What’s up with that?<\/p>\n","protected":false},"author":221,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7],"tags":[320,401,669],"coauthors":[],"series":[],"affiliates":[],"programs":[],"collections":[],"interests":[],"class_list":["post-10013","post","type-post","status-publish","format-standard","hentry","category-water","tag-la-nina","tag-oceans","tag-weather"],"acf":{"template_type":"standard","featured_image_type":"standard","is_audio_post":false},"yoast_head":"\nSo Much for La Ni\u00f1a | Climate Watch<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/ww2.kqed.org\/climatewatch\/2010\/12\/21\/so-much-for-la-nina\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"So Much for La Ni\u00f1a | Climate Watch\" \/>\n<meta property=\"og:description\" content=\"Pacific ocean conditions that often portend a dry winter sure haven't so far. 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