brooklynwx99

i also love seeing the split flow and Pacific wave breaking lead to +PNA. that’s a recipe for big storms

i expect another significant blocking spell at some point. probably late in the winter. i’d be surprised if there wasn’t another one

you don’t really need deep negative anomalies to get a big storm or two. just needs to be cold enough

makes sense given the retrogression of the AK trough as the +EAMT loses effect

GEPS looks pretty great. hopefully we can get a wavebreak to move that ridge closer to Greenland but this is still more than enough. heights over AK have recovered and colder than average air has filtered in alongside AN precip makes sense given the retrogression of the AK trough as the +EAMT loses effect

GEPS looks pretty great. hopefully we can get a wavebreak to move that ridge closer to Greenland but this is still more than enough. heights over AK have recovered and colder than average air has filtered in alongside AN precip

finally no more Niña BS either… MJO is now moving into typical dateline-western IO phases

to be fair, that is the 500mb change run-by-run. this is the actual 500mb pattern on the EPS and GEFS… still quite nice and getting towards something very good

yeah the ENS are encouraging. seeing heights over AK recover as the trough retrogrades and also seeing hints of AN heights build into Hudson Bay

i think it’s one of those constructive/destructive interference variables. low snow cover constructively interferes with warm weather and vice versa

gotta like where we’re heading

like seeing the AK heights recover too. that’s big. we want to see more of these HL changes

to be fair, NA snow cover was on the high side for a good portion of last winter, especially early, and it meant next to nothing

yeah if it’s mid-Jan and we’re still staring at a torch for the next 10 days, i will be worried, but there are zero signs of that happening

the “no changes” stuff is like easily one of the most annoying things ever. the goalposts can be moved forever since they’re never established to begin with changes in snowfall? height anomalies? the overall pattern? sun angle? geese population? can literally be anything

and? this is later in the run as the pattern progresses

late month is interesting. just for the sake of demonstration, I will use the 06z GFS OP from this morning we get a strong storm that’s in a marginal airmass that’s just a bit too warm for snow. however, given the weak SPV, we get in-situ -NAO blocking to form as a result, setting up a 50/50 ULL. on the Pacific side, the AK trough continues to retrograde, allowing for the PNA to spike. we end up getting a potent S/W that’s about to get trapped under the developing block with cold in place although this is an OP run, it does show a totally reasonable pattern progression that can get us from a torch to something favorable in about 7-10 days

no changes!

like i know it’s an OP run, but that’s a gorgeous pattern progression and the ENS are feeling it too. certainly something you wouldn’t complain about

this is the run being complained about. you get one amped storm that leads to in-situ -NAO blocking and forms a 50/50. then, the AK trough retrogrades and pumps the PNA. S/W dives and amps. this would be a crusher verbatim

the raising of Greenland heights over the last few ENS runs could really be a game changer. hopefully that’s legit and is a function of models feeling the weak SPV somewhat

the evolution for the end of the month is pretty similar to the thoughts of myself, @psuhoffman and @CAPE. at first, the airmass is marginal for any larger storm after Christmas, and we get a rainstorm out of a pretty well-tracking system: however, that system then leads to wave breaking towards Greenland and the development of an in-situ -NAO. there is also retrogression of the AK trough, pumping the +PNA as a S/W amps: of course, these are OP runs at range and not really meant to be taken seriously. however, this is a reasonable pattern progression that shows how we go from an all out torch to one where we can actually see something of note

GEFS continues to look good for Christmas week. now we have BN heights beforehand as well as AN heights poking towards Greenland

they shouldn’t run these everyday. it’s overkill in my opinion

this will work. what a ridge in central Canada. that'll promote HP in a good spot