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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ORDER YOUr fresh POLAR VORTEXES from MAGRATHEA! We are proud to present a ONCE in a LifeTime opportunity for acquiring Your fresh polar vortex from our atmospheric division. In a rare auction, there has been a late entry of a Used but still working Polar vortex from the Vogon Constructor Fleet. They found this Nice looking vortex on a planet whose inhabitants were planning to change their planets name! As is by galactic law, "All planets which have a 'double A' in their name, will also have to change another of their Polar Vortexes to be unstable ALL the YEAR." This has been done by the Vogons and they supply the necessary rotary and atmopsheric balance to your bid. Stabilize your Polar Vortex by bidding the highest, in the best Kakrafoon style!
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