The British Isles turns cold following a sudden stratospheric warming some 66% percent of the time. The mid February warming of course led to the record breaking ‘beast from the east’ last week.
When Europe turns cold a week to 10 days following an SSWE, the NAO is often very negative along with the AO.
According to Etienne Kapikian (@EKMeteo) on twitter, the -NAO we just had was the strongest for any month except January 2010 since 1948.
Meteo France
His below tweet states that for March 1-2, 2018 is strongest daily indexes for any month except 1948 but absolute record goes to January 2010.
Oscillation Nord-Atlantique négative extrême : l'indice NAO aurait battu un record mensuel bas ce 1er mars 2018.
Les indices quotidiens des 1er et 2 mars 2018 sont les plus bas pour tous mois sauf janvier, depuis 1948. Le record absolu reste détenu par le 3/01/2010.
données NOAA pic.twitter.com/wEMbe8SspR— Etienne Kapikian (@EKMeteo) March 5, 2018
He also states that the previous records for the February-March periods go to 10 March 1951 and 2 February 1963.
Les précédents records de NAO négative quotidienne la plus basse pour la période février-mars datent du 10 mars 1951 et du 2 février 1963. pic.twitter.com/XPlrGjyNk4
— Etienne Kapikian (@EKMeteo) March 5, 2018
So, the first SSW since 2013 brought a record -NAO and in turn a record breaking spell of winter which will be etched in our memories for many years to come.
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