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Saturday, February 20, 2021
Why the sun played a role in the extreme cold?

By Joseph D’Aleo, CCM

See the February temperature anomalies (as much as 36F below normal to 02/20). It reached down to Oklahoma and Texas with deadly results with ice and cold freeing wind turbines and snow covering solar panels.

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We had our stratospheric warming in January after a lower level preview in mid-December. See the result is the arctic oscillation going negative.See the result is the arctic oscillation going negative (line graph beneath the maps).

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See the warming at 50mb.

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Warmings cause pressure to rise in the polar atmosphere that deliver cold air to mid latitudes (right) replacing the flat zonal flow with a cold arctic (left) which brings ocean modified air inland.

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See the result the last month at the ground level.

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See the cold plume into North America kept slightly west by the La Nina southeast ridge.

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See how the AO was more negative that anytime since 2008-2010.

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See the 2009/10 warming and persistent -AO.

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2009/10 was most negative since 1976/77.

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The warmings are more frequent near solar max and solar min.

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The solar grand max was in the last century after a quiet start. See the deeper Dalton minimum in the early 1800s and the long Maunder in 1600s.

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The cycles have been diminishing as it did early in the last two centuries.

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We have had longer minima with more sunspotless days.

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See how the min years the last two cycles have ranked among the highest. This min is not over yet and the number will climb more.

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By the way the stratosphere has cooled but will warm again - another mid to late March flip? Happened in other years - late 1950s.

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Warming in forecast high up in the Atlantic sector (affecting NAO?)

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Posted on 02/20 at 05:00 PM
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