Texas' state climatologist (who might be fired if Tricky Ricky gets even more anti-science, eh?) says the current state drought could be part of a longer dry spell lasting until 2020.
Here's part of why:
Forecasters predict dry weather to last long-term beyond the next decade from the La Nina phenomenon that continues to recur, including in the upcoming year, to cool the surface waters of the eastern tropical Pacific Ocean.John Nielsen-Gammon also notes something along the lines of what I've said ... as records get gathered, our baseline of information for "worst," "100-year events," etc. changes.
But, even he didn't mention why La Nina might be stronger ... climate change. Global warming.