
The critics are loud, but weather experts still say sub-freezing temperatures do not discredit global warming theories. USA TODAY
The recent brutal American cold snap was a freak of nature, scientists say, who added that such extreme cold is far less likely to occur than it used to.
Specifically, the frigid, record-breaking two-week cold spell that began in late December is now 15 times rarer than it was a century ago, according to a team of international scientists who study if extreme weather events are natural or more likely to happen because of climate change.
"Cold waves like this occurred more frequently in the climate of a century ago and the temperature of two-week cold waves has increased throughout North America, which is consistent in a climate of global warming," said Geert Jan van Oldenborgh, a senior researcher at the Royal Netherlands Meteorological Institute.
The study by the World Weather Attribution group analyzed weather records dating back to 1880 and found the cold weather that hit a swath of the U.S. from Maine to Minnesota tends to happen once every 250 years. In the early 1900s, it happened about once every 17 years.

Much of the U.S. celebrated the beginning of 2018 in the grip of record-breaking cold temperatures Time
Climate change has made such cold spells less common and less intense, the group said. The scientists say cold waves are now, on average, approximately 4 degrees warmer than they used to be.
World Weather Attribution is an international effort to analyze the possible influence of climate change on extreme weather events, such as storms, extreme rainfall, heat waves, cold spells and droughts. It's a partnership of Climate Central and several universities.
Regarding a possible climate change link through the effects of lower sea ice extent in the Arctic, the research team said the climate pattern that led to this two-week cold period did not occur more frequently in recent years.
“We do not find any evidence of intensification of this type of cold wave due to climate change; in fact, the Arctic air moving south is now warmer, which accounts for the trend of warmer cold waves,” said Claudia Tebaldi, a science fellow at Climate Central.
They found that although this type of extreme cold event has decreased in both intensity and frequency over the last century, it will continue to occur.
“This cold wave was exceptional,” said Gabe Vecchi, a geoscientist at Princeton University, “for being 7°F to 11°F colder than the coldest two weeks in recent decades and for occurring so early in the season, especially in light of the decrease in intensity and frequency of cold waves over the past century.”

Beat those cold weather blues. Buzz60
Meteorologist Ryan Maue of weather.us, who was not part of the World Weather Attribution team of researchers, said "this attribution study is a straightforward yet concise analysis of the recent record cold in the context of our historical records. From the recent National Academy 'attribution science' review, we have 'high certainty' and 'high confidence' in attributing the reduction in extreme cold events to human caused climate change."
"The Climate Central led study conclusions fit exactly with that consensus opinion: less frequent and severe cold is a consequence of global warming."
However, Maue does not agree that global warming due to lack of Arctic ice can be directly linked in any way to these sort of cold waves, as some scientists have claimed: "Instead of baffling the public with emerging theories or counter-intuitive explanations, scientists should simply explain what we confidently know: winters will still exhibit extreme cold for decades to come but the historical trend is toward less frequent and extreme cold due to global warming."
Contributing: The Associated Press
Posted!
A link has been posted to your Facebook feed.






























































































































Like this topic? You may also like these photo galleries:
1 of 163
2 of 163
3 of 163
4 of 163
5 of 163
6 of 163
7 of 163
8 of 163
9 of 163
10 of 163
11 of 163
12 of 163
13 of 163
14 of 163
15 of 163
16 of 163
17 of 163
18 of 163
19 of 163
20 of 163
21 of 163
22 of 163
23 of 163
24 of 163
25 of 163
26 of 163
27 of 163
28 of 163
29 of 163
30 of 163
31 of 163
32 of 163
33 of 163
34 of 163
35 of 163
36 of 163
37 of 163
38 of 163
39 of 163
40 of 163
41 of 163
42 of 163
43 of 163
44 of 163
45 of 163
46 of 163
47 of 163
48 of 163
49 of 163
50 of 163
51 of 163
52 of 163
53 of 163
54 of 163
55 of 163
56 of 163
57 of 163
58 of 163
59 of 163
60 of 163
61 of 163
62 of 163
63 of 163
64 of 163
65 of 163
66 of 163
67 of 163
68 of 163
69 of 163
70 of 163
71 of 163
72 of 163
73 of 163
74 of 163
75 of 163
76 of 163
77 of 163
78 of 163
79 of 163
80 of 163
81 of 163
82 of 163
83 of 163
84 of 163
85 of 163
86 of 163
87 of 163
88 of 163
89 of 163
90 of 163
91 of 163
92 of 163
93 of 163
94 of 163
95 of 163
96 of 163
97 of 163
98 of 163
99 of 163
100 of 163
101 of 163
102 of 163
103 of 163
104 of 163
105 of 163
106 of 163
107 of 163
108 of 163
109 of 163
110 of 163
111 of 163
112 of 163
113 of 163
114 of 163
115 of 163
116 of 163
117 of 163
118 of 163
119 of 163
120 of 163
121 of 163
122 of 163
123 of 163
124 of 163
125 of 163
126 of 163
127 of 163
128 of 163
129 of 163
130 of 163
131 of 163
132 of 163
133 of 163
134 of 163
135 of 163
136 of 163
137 of 163
138 of 163
139 of 163
140 of 163
141 of 163
142 of 163
143 of 163
144 of 163
145 of 163
146 of 163
147 of 163
148 of 163
149 of 163
150 of 163
151 of 163
152 of 163
153 of 163
154 of 163
155 of 163
156 of 163
157 of 163
158 of 163
159 of 163
160 of 163
161 of 163
162 of 163
163 of 163