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February Medium/Long Range Thread


stormtracker
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37 minutes ago, WxUSAF said:

EPS also tending to shear out the trop PV last few runs. That would limit the HECS-like chances. 

 

If…if..can…can…could…could we 

Not sure why we import outside opinions from those who never post  here and whose skills are unknown. If they wish to participate here then They should do so themselves 

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13 minutes ago, AtlanticWx said:

euro made two negative shifts this run looking at it. by hour 84, there's less interaction between the two waves. additionally, the kicker is more destructive, stringing it out but stringing it out too late for it to affect us. 

Nope 

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euro made two negative shifts this run looking at it. by hour 84, there's less interaction between the two waves. additionally, the kicker is more destructive, stringing it out but stringing it out too late for it to affect us. 

Need the NS upper level energy to dig further south or we’re looking at a congrats Boston. I’m retired from 3-6” snowfalls for the season…it’s go time.
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4 minutes ago, psuhoffman said:

I do find it a little odd that across the board the op runs are more  amplified compared to their ensembles. It’s been that way for a few runs now also. 

yeah i wonder why this is the case. is it because ensembles are more low res besides eps and eps is the most juiced out of them? 

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31 minutes ago, Terpeast said:

Relax guys. Shifts like these are to be expected this far out. If you’re looking for a 20”+ HECS, you’re setting yourself up for disappointment. 

I'm just looking for snow over 6". And what happened to today, I'm wondering how low the low end is. I mean...isn't or partial phase (or worse) still on the table?

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1 minute ago, Maestrobjwa said:

I'm just looking for snow over 6". And what happened to today, I'm wondering how low the low end is. I mean...isn't or partial phase (or worse) still on the table?

I think Eastern areas are really locked in.

I think for areas west it's still up in the air how well we do.

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I do find it a little odd that across the board the op runs are more  amplified compared to their ensembles. It’s been that way for a few runs now also. 

They should be more amplified they run at a higher resolution
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1 minute ago, MDScienceTeacher said:

Really ?? I thought the ensembles have the same number of grid points as the op?  And each member just gets initialized with slightly screwed data to find out how reliable the run is?

No it’s lower resolution, it takes like hours upon hours of a super computer just to do the euro run once, to run 50 permutations they have to lower it I think just because of computing power limits. 

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I find it odd those making the case there is a de-amplification trend on the EPS skipped the 6z run. That was actually the most amplified run there’s been!  But sure if we ignore the more amplified runs it’s a trend lol. IMO we need another run or two to see if it’s a legit trend. 
 

I do find the disconnect going on between the op and ensembles across all guidance to be odd. If it was just one run I’d be even more worried we just had a fluke where all the ops spit out an unlikely outlier solution. But it’s been for several runs now across all guidance and the math on that makes it being a fluke astronomically unlikely. There is something in the physics between the ensembles and the operational causing this. 
 

All I’ll say is anecdotally I’ve noticed a disconnect like this a few times inside 120 hours. Outside that always go with the ensembles. But inside day 5 lately the operational have actually been better. At least in situations recently when the op spit out an undesirable run and we were clinging to a better ensemble, it never saved us.  Oddly this was in reverse recently when the ops were less amplified and is northerners climbed to some ensemble runs with better snow lol. 
 

I would need someone more familiar with the physics behind why there might be the more less amplified divide between the ops and ens to give a more substantive analysis over which is more likely missing something. 
 

normally you take the ensemble because of the fact it’s weighting multiple members to account for a fluke outcome on the op. But at this range and given the phenomenon is across all guidance for multiple runs I don’t think it’s a fluke it’s a clear difference between the two and I don’t know what’s causing it but given the relative accuracy of the ops lately and their higher resolution I’d be inclined to side there. Unless there is a case to be made their higher resolution is tricking them into an erroneously over amped solution. 

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