FORT WORTH — The drought that has plagued Texas is virtually certain to continue at least until early summer, climate experts said on Tuesday at a conference in Fort Worth. But what happens after that is anyone's guess.

The main cause of the drought, the most intense in recorded Texas history, is back-to-back episodes of La Niña, a Pacific Ocean phenomenon that almost always brings dry conditions to the state. The bad news is that, based on the historical record, there is a 40 percent chance of La Niña returning for a third consecutive year, according to Klaus ...

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