weatherwiz

Unfortunately unable to chase tomorrow.

mesos are definitely becoming a bit more intriguing with tomorrow

This is just round 1. Round two is going to ignite within this area and we'll see a line of supercells quickly fire up in the next 2-4 hours. Big instability building within this area and will build downstream as the clouds break and temps skyrocket with steepening lapse rates

I don't think so. The idea of multiple rounds has been modeled quite well with this round expected to be quite intense as well. This will certainly impact things on a mesoscale level and may result in some shifts in best potential for later as this could influence how far north the warm front gets. But you can see it will (well already kind of is) rapidly intensity from east-central Missouri into south-central Illinois and that air will lift north as the warm front does. If anything, this MCS may lead to further enhancement for some localized strong/violent tornado potential with residual outflow boundaries and enhanced local vorticity

Definitely going to need those temps and even if we can push the dews into the lower 70's. LFC looks pretty high tomorrow so definitely going to need extra support

12z HRRR a bit more intrigued with tomorrow

I don't think there has been a situation ever involving a nearby boundary and GFS based products or NBM based products actually throw out numbers suggestive of not warm sectoring. This is going to be a big problem when its basically just NBM for a text based product

But at least when the cap breaks you are rapidly transporting moisture into the troposphere!

drier air aloft also looks to be an issue down this way

MAV 76 for BOS tomorrow MET 66 (and thats the evening) NBM 81 must be a front or something nearby tomorrow

I wonder if we see a small high risk on the new D1. That is a wild environment that will be evolving today. That is a very elongated line of supercells which develop ahead of the cold front later and not to mention supercells which develop along and ride parallel to the front and will be ingesting destabilizing air from the south.

Forget the stupid hazard type. But holy hell WTF

A sounding from eastern Illinois from the 18z NAM...a bit of a cap around 700mb but this is an extremely scary profile. You put a mature supercell into this environment and there is absolute concern for a long tracked tornado

Screwed up earlier...I think I said uncapped Thursday but in fact, we may end up capped given how warm it is aloft. Best chance for anything during the afternoon may be the northern Hudson Valley actually into NNE where the forcing will be stronger and mlvl temps a bit cooler

You're correct in that thinking and I am idealizing it that way. Adding perspective to this thinking though, the reason why I am idealizing it that way is because it works. But you're 100% correct, we don't do that around here, or extremely rarely. But it isn't proper or really correct to try and compare our environments or setups to those of the Plains. We all know why the Plains get higher-end/widespread outbreaks - EML. As you know, when it comes to getting severe weather or tornadoes - an EML isn't necessarily important (if you want widespread/high-end severe it is). So, I guess the jest of the series of posts is to try and put out there that in our discussion of this potential, we aren't calling for widespread severe or higher end severe...so if we only get a handful or svr reports or a tornado some aren't screaming "bust"...a handful of svr reports and even a tornado would fit the mold of what the most logical outcome is from this setup. This will be a mesoscale assessment for sure. We get dews 73-75F and bring about some cloud breaks...that would provide enough instability to perhaps fire a few cells and make those cells interesting.

Setups with off the charts wind shear tend to not really produce just because sufficient buoyancy tends to be limited. If setups of this magnitude had a tendency to produce, our average tornado numbers would be significantly higher. These very large hodographs with the veered llvls imply a great deal of llvl warm air advection, which is great, but not when its a theme through the entire troposphere. With this said, these setups always need to be closely watched and monitored because even one tornado or pocket of wind damage is likely disruptive to life/property. We'll have to see how much buoyancy we can develop but when 500mb temps are only progged to be ~-7C or -8C...big flag you aren't getting much in that department, particularly enough to provide parcels with additional acceleration once past the LFC.

The one drawback in this type of scenario too is you can often get a ton of clouds/precipitation...this is where something along the lines of an advecting EML because it allows for rapid clearing and capping behind the WAA driven precip. The other problem with Thursday too is the degree of shear is so strong and the lapse rates are so weak that it will be difficult to develop mature enough updrafts to really utilize the shear and be strong enough to continue growing vertically and not get toppled over.

Probably cooked for any severe weather potential here on Thursday. Going to have widespread clouds with the warm front moving through and we won't have time to really destabilize during the afternoon. Plus with poor lapse rates and a weakly uncapped airmass, we'll remain heavy in the clouds with pop up showers. Could be interesting though just off to the west, particularly in the lower Hudson Valley. May have to watch Fairfield County though

Yeah sure is. This could potentially be a high risk scenario depending on how the details evolve. Could have significant tornado potential depending on storm mode and in fact, there could be two rounds of tornadic supercells; one in the morning then again later in the day. Tornado potential may be a bit lower with round 2, however, if linear mode dominates in which we'd probably see a significant wind event.

Save 80/65 for Christmas. bring on 99/75

For sure the upcoming weekend will be on the cool side behind the system but the week should be right around average and Thursday quite a bit above. For BDL, I wouldn't be shocked if they hit 80-81 on Wednesday

Another tally mark under the "AWT" category

Great, now there is a whole lot of media hype about the "cold blob" of water south of Greenland. Isn't that this the manifestation of the AMO heading towards the negative phase?

I am going to guess the NAM is a bit overdone with the mid-level lapse rates which could put a bit of a damper on the potential in terms of higher-end potential stuff, but that would still probably be a tornado outbreak across PA/southern NY into NJ.

Heavy violence across PA on Thursday via the 6z NAM