Webberweather53
Meteorologist
Fairly big difference day 10+ over the arctice on the GEFS v/s EPS. Obviously we want the EPS...to block or not to block....who you got...
View attachment 154835
Comes down to the latitude and extensiveness of the pacific jet. A stronger/poleward shifted jet lowers the heights over Alaska & the Bering Sea more on the GEFS. Today’s EPS took a step towards the GEFS in the long range.
It’s a delicate balance between having a strong enough pacific jet to trigger a +PNA but not too strong that we get stuck in an east-based Nino type pattern. We also don’t want it to totally retract to the point where we get stuck in the canonical La Niña/-PNA pattern