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La Nina is Back

La Nina is Back

by Kristin Walls

WHAS11.com

Posted on September 12, 2011 at 1:34 PM

Updated Monday, Nov 4 at 11:24 AM

La Nina...it’s back!

What is La Nina? It naturally occurs every three to five years over the tropical Pacific Ocean. It results from interactions between the ocean surface and the atmosphere. Over that area, they will experience cooler-than-average ocean temperatures that will impact the global weather patterns. Back-to-back episodes happen about 50 percent of the time, so it’s not rare that we are seeing another La Nina after this past one that occurred in June 2010-May 2011.
If you haven’t heard us talk about La Nina, I’m sure you will remember the record flooding or the record number of tornadoes back in April of this year. Well, it was La Nina that contributed to the records set this past spring. We not only had extreme weather in Kentuckiana, but also around the globe during the first half of 2011.
So, what does this mean for us this winter? Since last winter was also a La Nina winter, it will be very similar this year. We should expect normal or slightly above average temperatures and above average chances of precipitation. If the temperatures are above normal, then most of that precipitation type would be rain. However, we still have to watch out for snow since our precipitation chances are higher.

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