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August 2008
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Not exactly a surprising forecast: Arizona's fall looks to be warm and dry. The National Weather Service's Climate Prediction Center just issued it's look ahead for October, November and December. Almost all of Arizona is forecast to have warmer than average temperatures and below-average precipitation. But don't blame The Forecasters...blame La Nina. Yep, she's back. The climate phenomenon means that a periodic cooling of sea surface temperatures across the central and east-central equatorial waters of the Pacific. La Nina conditions are present right now in the tropical Pacific Ocean, and they're forecast to get stronger over the next few months. Data going back to the 1950s shows a strong correlation between those lower ocean temperatures and the desert Southwest getting less rain and snow. This doesn't ALWAYS happen...but there's probably a good chance it means we'll stay pretty dry over the next few months. |
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