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What does a 40 percent chance of rain mean?

With our rain chances on the rise for the next few days, you might have heard your local forecaster talk about the probability of precipitation or PoP.  But what does a 40% chance of rain really mean?  It turns out that not even meteorologists agree on a definition.  Check out Dr. Marshall Shepherd’s blog from Forbes.com on some recent research activities at UGA on this topic here.

Source: Commons Wikimedia

Source: Commons Wikimedia