12z GFS has some significant changes.
Changes for the better my friends. Anyone feel like an arctic outbreak?
First, this is the 0z GFS, for 0z Thursday (144hour)
http://www.nco.ncep.noaa.gov/pmb/nwprod ... _144.shtml
Notice how the ridge in the west is broad, therefore the trough in the east is shallow and positioned to the east of us, to where we only get glancing blows of arctic air.
NOW, take a look at the 12 GFS, for the exact same time, 0z Thursday:
http://www.nco.ncep.noaa.gov/pmb/nwprod ... _132.shtml
Noticable changes. First, instead of the very broad ridge in the west, the ridge is now much more shallow, and stronger, poking all the way into NW Canada. Therefore, the trough is now positioned farther WEST, and so, we are in a MUCH better position to recieve the brunt of arctic shots. The trough is now such that the angle is much better. If it could be positioned just a bit further west, it would be perfect. I've noticed the GFS trend west with the trough, so we'll need to watch tonight's 0z run to see what it does (18z GFS is crap in the long range). The 12z GFS is MUCH better looking for significant cold than the 0z ever was...
AND BINGO . ARCTIC FRONT ON 12Z GFS AT 162 hour:
http://www.nco.ncep.noaa.gov/pmb/nwprod ... _162.shtml
Thats cold stuff my friends. Again, THE POSITION OF THE TROUGH, AND THE STRENGTH AND POSITION OF THE WEST COAST RIDGE IS IMPORTANT. This is getting really interesting. And look whats up in Canada, a developing 1040MB+ High. After this first punch, we may have yet one more...
Again, this is all depending on if the 12z GFS is correct, I am just spitting out what it says for us. I think something like this could happen, but we just need to continue to watch. Once the 12z ECMWF comes out, I'll comment on that as well.
Air Force Met, jeff, care to share any comments on this?