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Climate Change and Cold Outbreaks in North America


pazzo83

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NCDC show February warming the most in Michigan with January slightly cooling since 1895.  Can't emphasis the slightly enough.

 

December warming but less than November and March.  But Feb had the highest rate of change.

 

The February warming signal is a major reason why several other locations like here in the Northeast have more

recent winter record lows occurring in January than February. 

 

 

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February has been trending colder lately, but it has a ways to go compared to the 100 yr average, we are about 1.5F over the 100 yr.

 

attachicon.giftrend.jpg

The 1990s were by far the warmest februarys on record for MI, so that sort of bumped the curve up. Feb cooled down in the 2000s (though still 3rd warmest Febs on record, behind 1990s and 1950s). The February story here though is all about the unprecedented increase in snowfall, not temps.

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  • 3 months later...

Figured this was as good a thread as any to post this. I have not yet read the actual publication yet and so not vouch for it, but plan to later today. 

 

http://mashable.com/2014/04/18/global-warming-drought-cold/

 

A new study has found that manmade global warming likely intensified an unusual weather pattern that led to both the California drought and the cold and snowy winter in the eastern U.S.

 


Abstract

The 2013-14 California drought was accompanied by an anomalous high-amplitude ridge system. The anomalous ridge was investigated using reanalysis data and the Community Earth System Model (CESM). It was found that the ridge emerged from continual sources of Rossby wave energy in the western North Pacific starting in late summer, and subsequently intensified into winter. The ridge generated a surge of wave energy downwind and deepened further the trough over the northeast U.S., forming a dipole. The dipole and associated circulation pattern is not linked directly with either ENSO or Pacific Decadal Oscillation; instead it is correlated with a type of ENSO precursor. The connection between the dipole and ENSO precursor has become stronger since the 1970s, and this is attributed to increased GHG loading as simulated by the CESM. Therefore, there is a traceable anthropogenic warming footprint in the enormous intensity of the anomalous ridge during winter 2013-14, the associated drought and its intensity.

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Thanks...this is starting to sound familiar

 

 

What they found was surprising. This dipole pattern has occurred relatively frequently since the mid-20th century, but has become more intense since the 1970s — meaning the ridges and troughs have become wavier, much like ocean waves that are getting taller.

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