SnowenOutThere

Yep, need the Friday storm resolved first

It's all about the interaction out West around the hour 90-110 mark. We need the leftover energy in the far Southwest to aid in the development of our shortwave coming out of the NS. Looking between the 18z and 12z shows how 18z just wasn't able to pull everything together fully and left too much energy out. Ofc, the NS digging and whatnot matters as well but I'd really like to see the energy out west be pulled East more (though this probably won't be resolved until our Friday system goes by as it is interacting with that storm as well). 18z 12z

Dont think the Monday wave is going to be as good as 12z sadly. Less consolidated so far.

Tbh that wave has nearly infinitely more potential as it’s not 3 separate ones in a trench coat pretending to be a real storm

GFS looks to be pretty similar to 12z so far (though out West is possibly slightly improved?) Didn't matter, if anything the run is a slight step backwards with the energy being more ribbony

Doesnt matter as we lose the thermals hard. I think if we're gonna get frozen we need shortwave one to work out

That would be the shortwave three option to get a storm which I mean maybe? Though no way to know if it'll be accurate this far out.

It has an extra lobe of energy further east than the 12z run and generally has the NS flatter instead of spikier worse run but impossible to know if itll verify yet 18z 12z

Don't know if this will actually embed how I want it to but this is what I mean. You can really see the string of vorticity in the early-middle part of the loop that suppresses the flow to the east (hopefully we get that to trend less intense/further north). Then we can see the second part with the west getting flooded with unconsolidated energy which results in the shortwave collapsing between the flow to the south and the western push. https://imgur.com/a/Eloa7k7

In fairness we are 3 days from the event which is now solidly NAM range

Does anyone know how to successfully embed links to gifs or images into posts?

So, over the past couple days I've been quite the downer on this storm having a possibility of bringing widespread snow to the area. In the past I mainly felt this way as we were relying on a convoluted mess of shortwave interactions. However, in the past 12 hours modeling has moved to put us on a far easier path to victory as they reemphasize shortwave 1 (previously we were using shortwave 3 even days ago) as the dominant way to get precipitation into our area. Of course, it could shift the other way but this is exactly the trend we want to see. Lets take a look at the difference between the past GFS runs that leave us high and dry and the Euro/NAM camp that actually has a real storm. This GFS run shows our first shortwave that gets compressed by a combination of factors. We have energy flooding the west (feature 3) and another NS shortwave which really is the main issue (feature 4 note the string of vorticity connecting to feature 3). Feature 2 is just sorta helping with moisture transport and imo isn't overly important. So, we run this forward in time and we see this: Feature 1 is now basically nonexistent as it is a ribbon of vorticity from Texas to Virginia. So, the real push northward of precip is instead by feature 2 and 3/4 interacting with each other which frankly was never going to workout unless we got a minor miracle (and the thermals would be bad from the extended return flow anyways and was shown by the GFS having rain where there was any precip). It was from this perspective that I believed there was no way we could get a storm into the Mid-Atl Lets compare to the Euro/NAM: We already have shortwave 1 way more clearly defined and less strung out. This is what actually causes a storm in this run not shortwave whatever the hell the GFS does! Notice how much simpler this is! its just a shortwave out west moving east into cold air! We can legitimately do that! Of course, features 3 and 4 are still there but they are held back and give us a little more breathing room. By Friday morning itself the difference is even more clear as there is still a consolidated mass of vorticity and that creates our storm. What we need to look for is for features 3/4 to slow down or dig south at a sharper axis to encourage the first shortwave to consolidate. For instance see the difference between 6z having the energy out northwest of our storm being flat across Chicago and the 12z having it spike north south west of Chicago area and encourage development downstream instead of suppressing it. I think that piece of energy is the main thing we have to watch (the Nam 3k has an amazing depiction of how a flatter and faster NS energy will suppress the flow but sadly I don't have the upload space but please go and make one yourself), if it manages to hold back or dig further south while maintaining a good axis I think we're in the game to get a nice snow day Friday. TDLR: I am no longer Debbie downing Friday. We got a legit shot if the Euro/Nam is right in the handling of shortwave 1 as the primary piece of energy.

Making the thread as we speak

I can start it

Though seriously, we are in a far better spot than we were for Friday last night. We are now actually just tracking shortwave one and not shortwave 3 which I identified a couple days ago as being a way less complicated setup.

Man the progression is so interesting modeling wise to how we score I want to type it up but I have chemistry homework I gotta do before my 2pm Env. Sci. class

Also holy shit weatherbell is so nice

Not bad at all

12z 6z for comparison

From the 500 vort it looks to be better than 6z but not as sharp as 0z

I think the base Euro should be a bit norther

Since I'm procrastinating studying I'll have an updated analysis on this Friday out soon. Interestingly, it looks like the main way the NAM scores is through shortwave one instead of shortwave three as it was shown a day ago.

Charlottesville is locked in with this track

Damn 100mb low I didn't know day after tomorrow was a work of nonfiction! That said this is a great look imo for within a week!

I mean the timing is just extremely unfortunate for schools so they made the right call. Anyways can't wait for my 15 minute walk to my 8am class tomorrow!