In article ,
Will Hand writes:
the main effect will be to transfer
the high cell from over us to just further east and then build over
Scandinavia. There is just enough progression in the longwaves to allow
this. Once established the pattern will be of the correct wavelength to
become stationary allowing the very cold and potentially bitter spell with
widespread snow to begin.

My own experience suggests that by the time we get almost into March we
generally need a north-easterly for real cold, since Europe to the south
of the Baltic tends to be warming up rapidly as the sun gains in power.
So a lot is likely to depend on the precise position of the High and
whether it produces a north-easter or an easterly.

I can still remember March, 1962 as showing what a persistent NEly can
do.
--
John Hall
"It is a very sad thing that nowadays there is so little useless
information."
Oscar Wilde (1854-1900)