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January 6-7 Storm Discussion: we’re due?


WxUSAF
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4 minutes ago, psuhoffman said:

looking at the thermals I don't see how that is correct.  There are warm layers everywhere during the whole event.  I would be shocked IF the euro is right if anyone east of the BR got more than an inch or two at most.  

It's not all that dissimilar from the GGEM just warmer.  One reason its warmer is the coastal is way less of a defined feature initially until it gets to our latitude.  It's more just a wave along an inverted trough with a southerly flow up into our area at the mid levels. 

That inverted trough (trowal maybe?) is sort of the killer. Not sure how real that feature is. I actually though euro looked decent/good before it got to us. 

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5 minutes ago, CAPE said:

Still considering a short chase to Gettysburg or Harpers Ferry area. Only if it's all snow and 5"+. Looks like a decent bet rn. Otherwise I'll just stay here and enjoy yet another heavy rain event lol.

I am supposed to be seeing Aaron Lewis at the Charles Town track on Saturday night. I was worried about it getting cancelled. Not so sure anymore. 

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7 minutes ago, CAPE said:

Still considering a short chase to Gettysburg or Harpers Ferry area. Only if it's all snow and 5"+. Looks like a decent bet rn. Otherwise I'll just stay here and enjoy yet another heavy rain event lol.

Might be able to drive in and drive out in the same day... hotel room not even needed

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21 minutes ago, Buddy1987 said:

Kind of wishing for something at this point that doesn’t want to come to fruition. Congrats to people like @WxWatcher007 and @clskinsfan and folks up that way. @mappyyoull prolly end up good side of things too. 

Nobody here wants to hear it but this one is far from settled even up here.

I sincerely hope this is one where everyone from DC up to here can get a break. It’s been historically awful for us all and it’s time to end it. 

Good luck.

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31 minutes ago, Terpeast said:

Sounds like it pulled option A 

 

14 minutes ago, WxUSAF said:

That inverted trough (trowal maybe?) is sort of the killer. Not sure how real that feature is. I actually though euro looked decent/good before it got to us. 

I don’t know how to categorize it. There is no primary really. It’s nearly identical to the gfs.   Better high heading in. More confluence. Same exact slp track. 1-2 mb deeper as it passes us. There is a bit more of that inverted feature. That seems to jump the thermals quick right over us.  But maybe in the end it’s just a few degrees warmer and that makes a huge difference here. 

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Waffling time as no big location placements to mess with

By  Friday noon I’ll be going over my checklist 

High 1025-1030 and within 150 miles of southern tip of Hudson/James 

Low not moving north of VA/NC border and staying at 1000 and not lower.

Overnight lows Friday 27- 30 and dew points in the wee hours Saturday 20-23. 
 

onset time not optimal so need cloudy skies by 7-8am Saturday which should keep DCA around 35 at onset time but will get a 3-5 degree drop with steady precip

Pittsburgh colder or as cold as Boston 
 

 

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Is this going to be another day (like yesterday) where 6z & 12z look blah and things trend better at 18z and 00z? Or is this the start of a sustained trend for the worse? 18z and especially 00z will be very telling. If they continue the negative trend, then many of us are in pretty rough shape - even up my way. If models bounce back in our direction, we’re still in the game.

Guess the only “positive” thing here is that these differences are *relatively* small from run to run. We have been very much on the margins all along, so as PSU said, being a couple of degrees warmer on certain runs is the difference maker. Even the runs that looked good (0z gfs cmc Ukie and icon from last night) it was a pretty close call with a very sharp gradient. Showed 6-10” near Baltimore but just a couple inches along the bay. That’s a razor thin margin.

The good news is that mountains don’t need to be moved to get us back in the game. We don’t need huge shifts. If models are underestimating cold or the strength of the low by just a bit, we are well within the margin to bounce back. The bad news is that we are starting to run out of time here. Can’t remember the last time models had a storm, lost it, and got it back within 72-84hrs.

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24 minutes ago, psuhoffman said:

 

I don’t know how to categorize it. There is no primary really. It’s nearly identical to the gfs.   Better high heading in. More confluence. Same exact slp track. 1-2 mb deeper as it passes us. There is a bit more of that inverted feature. That seems to jump the thermals quick right over us.  But maybe in the end it’s just a few degrees warmer and that makes a huge difference here. 

Yeah, that’s why I was cautiously optimistic as the run developed. Then it just pushes warm air north with that trough. Maybe it’s real, maybe a fluke. 

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8 minutes ago, WxUSAF said:

Yeah, that’s why I was cautiously optimistic as the run developed. Then it just pushes warm air north with that trough. Maybe it’s real, maybe a fluke. 

It was kind of doing the same thing the last few runs too.  The thing is, as it was coming in, even before that feature, I was noticing its simply warmer.  I was toggling between different features.  Better high, more confluence, low in the same location...then I would look at the different thermals and it was simply warmer than the GFS and GGEM.  Yes that trough doesn't help but there is a hint at that same feature on the GFS also, the difference might just be the GFS is a few degrees colder heading in and so we barely survive it.  

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10 minutes ago, Terpeast said:

This is now within 72 hours, so maybe we start looking at the ops and mesos. Hope the mesos pick up on a colder bleed down that the globals might be missing. 

Wishful thinking maybe, but I've seen this movie before.

18z NAM is running as we speak. Certainly it can’t be worse. Certainly. 

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