My brother lives near Buffalo. Every time our president speaks about global warming they either have record snowfalls or a deep freeze. Since the weatherman can’t even predict weather correctly, how could they possibly know what it will be even a year from now! Yes, climate always changes but for all we know we may have a coming ice age!
Actually both of those conditions – extreme snowfall//blizzards and unusual freezes may both be due to GW.
Warmer air sucks up and holds more water vapor (evaporation) – causing droughts in some areas, but overall causing more precipitation, esp in the latitudes closer to the poles. This precipitation can come down as rain, hail, or snow depending on the temperatures at the time of the precip. This is a well-established impact of GW.
Not as well established, but gaining more scientific support, is that GW is causing more Rossby waves that linger longer. This is when instead of a more typical west-to-east weather pattern (for northern & mid-latitudes) it shifts to a wobbly pattern (like a pot on a potter’s wheel gone bad) – some areas south-to-north, bringing warmer weather to the arctic, and some areas north-to-south, bringing cold arctic weather southward…also connected to the “arctic express,” “Nor’easter,” and “negative arctic oscillations.”
Without GW these do occur sometimes, but recent research suggests GW is making this happen more frequently with longer, deeper, more lingering patterns.
Here is a post that explains the various studies re this (references below), focusing on a recent on (2014): “Rossby waves and surface weather extremes” at
realclimate.org/index.php/archives/2014/07/rossby-waves-and-surface-weather-extremes/
“they find that amplified quasi-stationary waves ‘increase probabilities of heat waves in western North America and central Asia, cold outbreaks in eastern North America, droughts in central North America, Europe and central Asia and wet spells in western Asia.’”
Here is another article that explains it - “Stratospheric Phenomenon Is Bringing Frigid Cold to U.S.” at
climatecentral.org/news/stratospheric-phenomenon-is-bringing-frigid-cold-to-us-15479
Here’s an image for Rossby waves:
• J.A. Francis, and S.J. Vavrus, “Evidence linking Arctic amplification to extreme weather in mid-latitudes”, Geophys. Res. Lett., vol. 39, pp. n/a-n/a, 2012.
dx.doi.org/10.1029/2012GL051000
• E.A. Barnes, “Revisiting the evidence linking Arctic amplification to extreme weather in midlatitudes”, Geophys. Res. Lett., vol. 40, pp. 4734-4739, 2013.
dx.doi.org/10.1002/grl.50880
• V. Petoukhov, S. Rahmstorf, S. Petri, and H.J. Schellnhuber, “Quasiresonant amplification of planetary waves and recent Northern Hemisphere weather extremes”, Proceedings of the National Academy of Sciences, vol. 110, pp. 5336-5341, 2013.
dx.doi.org/10.1073/pnas.1222000110
• J.A. Screen, and I. Simmonds, “Amplified mid-latitude planetary waves favour particular regional weather extremes”, Nature Climate change, vol. 4, pp. 704-709, 2014.
dx.doi.org/10.1038/NCLIMATE2271