On February 14, 2023 we announced our Rebuttal Update Project. This included an ask for feedback about the added "At a glance" section in the updated basic rebuttal versions. This weekly blog post series highlights this new section of one of the updated basic rebuttal versions and serves as a "bump" for our ask. This week features "Does cold weather disprove global warming?". More will follow in the upcoming weeks. Please follow the Further Reading link at the bottom to read the full rebuttal and to join the discussion in the comment thread there.
Late November-early December 2010 saw a memorable, bitterly cold snap in the UK that many residents will still remember. According to the UK Met Office on the night of November 27-28:
"Last night saw November minimum temperature records fall across the country. Most notably both Wales and Northern Ireland recorded the coldest November night since records began. In Wales, temperatures fell to -18 °C at Llysdinam, near Llandrindod Wells, Powys. Northern Ireland recorded -9.5 °C at Lough Fea. Scotland recorded a minimum temperature of -15.3 °C at Loch Glascarnoch, whilst England recorded -13.5 °C at Topcliffe in North Yorkshire."
Brr! But it pays to have a bit of a look around. Did you know that during the very same night, parts of Western Greenland hit plus 13 Celsius? That's more than 30 degrees Celsius warmer than Wales!
The reason for that remarkable difference in temperature was the weather. An elongated and slow-moving area of high pressure was situated in the North Atlantic, extending up into the Arctic. As a consequence, because air flows around high pressure systems in a clockwise direction, on the high's left flank warm air was being dragged up into normally chilly Western Greenland. But down its right flank there came cold Arctic air, surging southwards towards Europe, hence those unusually low temperatures.
It's easy to confuse current weather events with long-term climate trends. It's a bit like being at the beach, trying to figure out if the tide is rising or falling just by watching two or three individual waves roll in and out. The slow change of the tide is masked by the constant churning of the waves. Watch for 20-30 minutes and you should get a much better idea.
In a similar way, the normal ups and downs of local weather can often mask slow changes in global climate. To find climate trends you need to look at how weather is changing over a longer time span. Looking at high and low temperature data from recent decades shows that new record highs occur nearly twice as often as new record lows. New records for cold weather will continue to be set (although that -18C for Wales in November 2010 will take some beating), but global warming's gradual influence will make them increasingly rare.
Please use this form to provide feedback about this new "At a glance" section. Read a more technical version below or dig deeper via the tabs above
In case you'd like to explore more of our recently updated rebuttals, here are the links to all of them:
Posted by John Mason on Tuesday, 12 September, 2023
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