Earth is slowing down in its rotation, and nobody can figure this one out either.
However, the mystery of the above is relatively easy to explain, so it's not like there's no available theory to explain it.
Gerald Pollack suggested several years ago that our planet's rotation is most likely sustained by radiation from our sun. A sustained decrease in solar activity should then mean a slowing down of both wind speeds and rotation.
As it happens, our sun is gradually decreasing its activity, and this has been going on for a long time. We are approaching a solar minimum. A slowing down of Earth's winds and rotation is exactly what we should expect.
Current prediction for Sunspot Cycle 24
By David Hathaway, NASA, Marshall Space Flight Center – http://solarscience.msfc.nasa.gov/predict.shtml, Public Domain, https://commons.wikimedia.org/w/index.php?curid=28557779
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