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The greatest negative value for the Arctic oscillation since 1950 in January was −3.767 in 1977, which coincided with the coldest mean January temperature in New York City, Washington, D.C., Baltimore, and many other mid-Atlantic locations in that span of time, although the January Arctic oscillation has been negative only 60.6% of the time ...
NOAA map shows when the average coldest day of the year typically occurs in the United States: From the Northern Plains to the Midwest, Southeast and Northeast, the last two weeks of January are ...
AMOC-Index since 900 CE with pronounced slowdown since ~1850; Rahmstorf et al. (2015) [5] Climate scientists Michael Mann of Penn State and Stefan Rahmstorf from the Potsdam Institute for Climate Impact Research suggested that the observed cold pattern during years of temperature records is a sign that the Atlantic Ocean's Meridional overturning circulation (AMOC) may be weakening.
Later research found atmospheric changes, such as an increase in low cloud cover [122] and a strengthening of the North Atlantic oscillation (NAO) have also played a major role in this local cooling. [119] The overall importance of the NAO in the phenomenon is disputed [120] but cold-blob trends alone cannot be used to analyze the strength of ...
The warming of the air near to the ground leads to rising movements and the atmosphere becomes less stable. One of these patterns is the air pressure difference between the Arctic and mid-latitudes: the Arctic oscillation with the Azores highs and Iceland lows known from the weather reports. If this difference is high, a strong westerly wind ...
The NOAA's National Climatic Data Center found that since modern records began in 1895, the period from December 2013 through February 2014 was the 34th-coldest such period for the contiguous 48 states as a whole. They also found 91% of the Great Lakes were iced over, the second highest percentage on record. [100]
An arctic blast will send temperatures across the United States plummeting as bitterly cold air that originated in Siberia will arrive from Canada by week’s end, bringing with it dangerously ...
Some parts of the Arctic are covered by ice (sea ice, glacial ice, or snow) year-round, especially at the most poleward parts; and nearly all parts of the Arctic experience long periods with some form of ice or snow on the surface. Average January temperatures range from about −40 to 0 °C (−40 to 32 °F), and winter temperatures can drop ...