Carvers Gap

Ya'll need to see where the 18z GEFS ended its run...nice trend. We saw that once or twice yesterday, and now it's back.

I grabbed a couple of these from CPC...the MA forum has also posted these.

Powell, I hate to hear that. Hang in there.

The Euro Weeklies this afternoon definitely support that CFS MJO map. Get a good window from say Jan15-22nd-ish. Then, we roll a ridge complex through to end the month, then do it again to start February. The interesting thing will be if the cold can actually retreat or if it gets trapped under a HL block. The Euro control had the EC cold throughout the run. Just kind of seems like it is going to be difficult to push the cold out of the pattern for long periods of time, but I could be wrong! Ripe, ripe, ripe for an ice storm if we push a 500 ridge into the SE but the surface doesn't respond to the AN heights, ie stays cold.

Put about a 5-7 day lag on that CFS map, and we are looking at big easter trough by the end of week 1 of Feb or the very beginning of week 2.

Good 12z suite. In the meantime, some beneficial rains will occur before the cold moves in on Sunday. I think everyone has pretty much taken care of the 12z disco...not much to add from me!

We were a heat island before heat islands were cool.

Model of choice at 18z....AIFS Euro deterministic.

The 18z ensembles roll a ridge through as expected right around the 21s....and then they bring the trough almost immediately back East as the EPO rebuilds. 12z GEFS w/ the coup if that is how it works out - yes, wow. Crazy day today...and I have been out of pocket for most of it. Tomorrow should be the same. Don't assume my absence means bad things!

The 12z GEFS ensembles now lock the EPO ridge in place - that is a one day map, but the 5d for the end of the run looks very similar. It retrogrades the first EPO as we thought it would, and then almost immediately forms a new one. Does this pattern have more staying power than originally thought? Maybe. Some deterministic runs are portraying that scenario now. The EPO can be very difficult to break down once it forms. The 12z GEFS also has the NAO in place as well. Here are the comparison from 6z to 12z. The 12z Euro deterministic looks super similar to the 12z GEFS. That would mean that Larry is about to score the coup if it holds. He called that from November w/ analog forecasting and ENSO climatology. He was adamant. He might be within 7 days of that predicted pattern unfolding and hopefully holding. That look has precedent w/ previous Nina winters...just dig back through our threads. It looks the same as our recent Nina winters but the trough is nudged slightly eastward w/ more cold on the SE portion. That fits the cluster w/ -QBO reading and weak Nina winters. The QBO fell again during December to -26.92, and is a very low reading for that index. This could be a blip, or it could be a shift...but that is a pretty big move. Addendum: The 12z GEPS builds the EPO as well, but is a tad slower w/ the move. But the EPO rebuilding after the first cycle looks like a trend now at 12z. Even the EPS has moved AN height into the EPO region late in the run.

The 12z Euro does provide a path to snowfall for our southernmost areas of the forum w/ snow tracking from Louisiana into north GA/SE TN, and into the Carolinas. There is a lot of snow shower activity. At this range, it is going to be difficult for modeling to sort through all of the energy in the pipeline. Looks like nickels and dimes w/ the potential for a big dog(looking more like the 17th at the moment, but that could change). With such strong amplification, any shortwave is going to have to be watched closely. Just one cold air mass after another on the 12z Euro through the 23rd(end of run). Interestingly, the 12z Euro locks the EPO into place. Now, that would be interesting if that trend holds. I have seen that on some other models recently, but it doesn't budge much at 12z. It just keeps kicking the SER right OTS.

The 12z Euro is rolling. I can't see the surface maps yet, but again, another run w/ closely spaced vortices dropping into a very amplified trough. We might still be 24-48 hours from having a good handle on the 15-17th sequence of systems.

It really is crazy how much energy is in the pattern, but not surprising giving how amplified the trough is. It is antithesis of what we have seen w/ the longwave pattern this winter. The 12z CMC ends up w/ just one minor event after another. One thought as we wait for the Euro....we used to call systems that were back to back the "engine and caboose" setup. Modeling will often head fake w/ one system, string things out, and then consolidate w/ the other. Sometimes, the caboose ends up as the bigger storm, and sometimes the engine. I think modeling isn't sure which storm to phase, the 15th or 17th. It could end up strung out, but I kind of think one of those two ends up bigger depending on spacing. The caboose is stronger at 12z. edit: The 12z GEM gets very close to another system on the 17th as it does form a low which runs the coast as a weak reflection. The trailing northern stream still manages to dump a decent amount of snow on the northern 1/3 of the forum...east of Nashville 2-8" of snow in those areas. The mountains get pounded. The event is still ongoing as the run ended w/ a weak lee side slp forming.

The 12z GEM manages a neutral tilt phase over the TN and OH valleys. I can't see surface maps yet on the 15h, but that might be a Miller B hybrid.

Kind of for fun at this point and in fantasy land at 258, a piece of the TPV is now trapped under a HL block. It is losing latitude like it was dropped off of a building. Could be a cold run for the GL and NE....glancing shot here.