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I doubt that La Nina is having a major influence on the recent drought and cold front intrusions in Kentucky. If you check out the CPC's composites page, you will see that the typical influence of La Nina on Kentucky temperature and precipitation is pretty modest in the fall. A linear regression analysis from this site suggests that there may be a minor La Nina dry influence on Kentucky in the fall, but this sort of influence is not expected to last through the winter. So, I suspect that chaotic weather variability is the main culprit, but I wouldn't rule out some influence from La Nina. We'll keep an eye on it - thanks for the question! 

In reply to by Schroeder