Steep 5-7 day rises in temperature over Greenland typically heralds a developing -NAO and that’s exactly what we’re seeing now which promises a chilly week dominated by northerly winds over the UK.

Temps have went from -55 to -22 and it’s likely to warm further in the next few days. The reason for warming is the height rises over Greenland and a warming air mass.

We’ve a textbook -AO/NAO this week as heights rise in Greenland, they lower over Western Europe.

CFSv2 1-7 day

GFS ensemble 1-5 day

GFS ensemble has the toasty Greenland, chilly UK in the 1-5 and 6-10.

Notice both AO/NAO pulls back towards neutral but then takes another nose dive in early to mid December.

The projected weakening and displacement of the polar vortex could be why.

https://twitter.com/judah47/status/934769102106906624

https://twitter.com/wxcharts/status/934948406602162176

FEATURED IMAGE CREDIT: https://kcstormfront.wordpress.com/2013/11/15/winter-weather-in-our-part-of-the-midwest/

Tags: negative nao