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Tuesday, January 22, 2013

Polar vortex very anomalously weak; Arctic Oscillation negative for a very long time

Has anyone see a negative Arctic Oscillation Index go on for so long?



Text below from:  http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/hgt.shtml

The daily geopotential height anomalies at 17 pressure levels are shown for the previous 120 days as indicated, and they are normalized by standard deviation using 1979-2000 base period. The anomalies are calculated by subtracting 1979-2000 daily climatology, and then averaged over the polar cap poleward of 65° N.

The blue (red) colors represent a strong (weak) polar vortex. The black solid lines show the zero anomalies.



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1 comment:

Anonymous said...

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