bron netweather
I think there are two main considerations here, both of which increase the similarity with the December cold evolution, east flow to north-east and north.
Relative angular momentum continues to rise, reaching its highest value Feb value since 2005 (this time round colder continent and background hemispheric temps). Net contributions from the tropics, where anomalously strong west wids continue to build, place the global wind oscillation within high amplitude phases 5-6-7 which favour high pressure to the north-west. The fact that NCEP products all keep the Madden Julien Oscillation in the Pacific (phase 7/8) out to20th February suggest that the global wind signal is going to get stuck in a phase favourable to blocking.
Downwelling from the upper atmopshere continus. Slight slowing as per tonight's data but typical of intermittant propagation waves, especially when the atmosphere above is still anomalously wam - no cold air to flush the warm air down. Slow and sure.
Put those together, and blocking signal becomes for retrogression from high centred north of the UK towards southern Greenland - as per previous cold patterns with notable trough solutions for Scandinavia and central and western Atlantic.
I think there are two main considerations here, both of which increase the similarity with the December cold evolution, east flow to north-east and north.
Relative angular momentum continues to rise, reaching its highest value Feb value since 2005 (this time round colder continent and background hemispheric temps). Net contributions from the tropics, where anomalously strong west wids continue to build, place the global wind oscillation within high amplitude phases 5-6-7 which favour high pressure to the north-west. The fact that NCEP products all keep the Madden Julien Oscillation in the Pacific (phase 7/8) out to20th February suggest that the global wind signal is going to get stuck in a phase favourable to blocking.
Downwelling from the upper atmopshere continus. Slight slowing as per tonight's data but typical of intermittant propagation waves, especially when the atmosphere above is still anomalously wam - no cold air to flush the warm air down. Slow and sure.
Put those together, and blocking signal becomes for retrogression from high centred north of the UK towards southern Greenland - as per previous cold patterns with notable trough solutions for Scandinavia and central and western Atlantic.
„Et nul ne se connait tant qu'il n'a pas souffert, „C'est une dure loi, mais une loi suprème, „Vieille comme le monde et la fatalité, „Qu'l nous faut du malheur regevoir le baptéme, ~Et qu'a ce triste prix tout doit étre acheté. „Les moissons pour murir out besoin de rosée, „Pour vivre et pour sentir l'homme a besoin de pleura, „La joie a pour symbole une plante brisée, „Humide encore de pluie et couverte de fleurs."
