weatherwiz

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.