In article ,
Yokel writes:
Rather more interesting is the 16-30 day "Snowmageddon"
forecast which on the face of it does not seem to "follow" the
shorter term forecast at all, there being no indication in either
forecast of a transition back from the westerly to easterly types -
although the word "easterly" is not in the forecast it is implied by
the forecast temperature distribution and hinted at by the far end
GFS output (subject to the ususal "fantasy land" caveats about
that).

I think that the 6-15 day forecast is updated daily, but the 16-30 one
only once or twice a week (despite being given a date/time tag
suggesting that it is updated daily). That means that there's sometimes
a "disconnect" between the two forecasts.

Meanwhile the 12Z GFS and ECMWF operational model runs seem to have
upped the intensity and duration of the cold once more, as has the GFS
ensemble if not quite to the same extent as the operational run. (I
haven't yet seen the ECMWF ensemble.) Both models now seem to be
indicating that it will be exceptionally cold for much of the country
around next weekend (and pretty chilly before then).
--
John Hall
"The power of accurate observation is commonly called cynicism
by those who have not got it."
George Bernard Shaw