In article ,
Dave.C writes:
Went out for the day to meet an old school friend - came back and the GFS
850hPa ensembles seem to have gained 10C for next week. When I left it was 4
days of cold northerlies - did something radical happen while I was out?

It seems so. I too have noticed the big change between the 06Z and the
12Z runs.
--
John Hall
"Hegel was right when he said that we learn from history
that man can never learn anything from history."
George Bernard Shaw (1856-1950)