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November 20, 2012 November 20, 2012 November 20, 2012 November 20, 2012
Would the real October-November, please stand up
This drought and its statistics continue to trouble me. Here's the deal ... the
October-November 2010 period was what got this whole shebang started, and we
ended up with our second driest water year (Oct. 1, 2010-Sept. 30, 2011) on
record with a statewide average of 20.4" (1956 is still the driest at 18.7").
But that October-November period back in 2010 was extremely dry, and the
deficits just continued to mount through spring and summer. In comparison, the
October-November period from last year saw the beginning of significant relief
as we went through March 2012. Now this year, we're back to a 2010-style dry
period that is seeing drought intensify once again. Let's take a look at the
last three October-November periods (for 2012, Oct. 1-Nov. 20) and see how they
Year Statewide Avg. Departure Rank since 1895
2010 3.65" -2.5" 35th driest
2011 7.21" 0.9" 26th wettest
2012 1.66" -3.6" (within top 10 driest)
This October-November period thus far is more than twice as dry as the same
period during 2010 that started this whole mess off. Here are the three similar
periods in graphical form.
October-Nov. 20, 2012
Heck, 2010's October-November would be AWESOME right now, comparatively.
There's still not a lot of moisture showing up just yet. The 5-day has some
green painted over Oklahoma, but nothing significant at this time.
From the North American Ensemble Forecast System (NAEFS), the chances of our
area receiving at inch of accumulated precipitation over the next 15 days
are not bad in eastern Oklahoma, but not too good across the western half of
the state. This is for today through December 5. Remember, these are the
probabilities of receiving an inch of accumulated precipitation.
Not a great start to the 2012-13 water year, but nothing has been normal
around these parts the last few years. So continue to expect the unexpected.
Associate State Climatologist
Oklahoma Climatological Survey
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