On occasions blocking anticyclones ( high pressure systems ) may move over the United Kingdom, which can persist for weeks or even months.
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On occasions blocking anticyclones ( high pressure systems ) may move over the British Isles, which can persist for weeks or even months.
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Trenberth said that while a negative North Atlantic Oscillation and a blocking anticyclone were in place, the null hypothesis remained that this was just the natural variability of weather . which contributed to the storm surge.
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Noting that these blocking patterns are unusual in the fall but have been increasing, meteorologist Jeff Masters said that three studies in 2011 found " that the recent record decline in Arctic sea ice could be responsible, since this heats up the pole, altering the Equator-to-pole temperature difference, forcing the jet stream to slow down, meander, and get stuck in large loops . " Trenberth said that while a negative Arctic Oscillation and a blocking anticyclone were in place, the null hypothesis remained that this was just the natural variability of weather.
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