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February mid to long range threats discussion


Ji

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no they (we) don't

we are all too familiar with the seasonal trends

and what has become ironic is that even the models have established a trend this season by advertising similar snow scenarios 4+ days out only to fail

I think people read the models wrong, I don't remember any threat since the Thanksgiving one where a majority of models runs over consecutive days on end showed a big snow event.  There have been lots of storms where a random run here or there would show snow.  Or for one day all the models had an event before continuing to shift towards the correct solution.  Take this storm, there has never been 2 straight runs where a majority of models showed us getting big snow.  One run the GFS will...the next run its gone but the GGEM shows it.  If you add up all the runs over a 3 day period maybe about 30 percent show snow.  That is indicative that we have a shot but its less then 50/50.  Problem is people will remember the one run of the Euro, or GFS or GGEM that showed a moster storm, and then when it doesnt happen thing "the models said we were getting snow and we didnt again".  They have never indicated a high probability for any storm.  This is not like 2010 where run after run for days we would get 10"+ on almost every op run.  This is the type of pattern where every individual storm is low probability, but overall not a hostile pattern, if given enough shots one of these might work out.  We have had PLENTY of snowstorms in this pattern in the past. 

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Every cold shot lately is modeled too strong at a distance.

 

Last Friday, my forecast temp Tuesday morning was 1.  It was 17 in reality.

 

Two days ago, my forecast low Friday was 6.  At last check it had risen to 11.  My guess is that it keeps climbing.

 

The storms might be trending north lately because the cold air is trending north of where first modeled.

 

Probably modeled that way with the then existing forecast there'd be a good snow pack on the ground.  There was none, thus it was warmer.  It changed as soon as it was clear we'd have no snow cover to radiate.

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I think the problem if this doesn't work is not that the storm goes "North" its that the whole trough axis may end up too far east.  The reason the initial vort starts north of us is the trough is so far east even though its diving south its coming across to our north.  The h5 energy does eventually end up south of us, and in a good spot, but its fighting the initial system starting too far north due to the trough being very far east.  It has to retrograde the entire thing almost.  One way to work out is the first system is weak and leaves room for the second to go nuts and bomb out to our south but its not a perfect seetup at all. 

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Every cold shot lately is modeled too strong at a distance.

 

Last Friday, my forecast temp Tuesday morning was 1.  It was 17 in reality.

 

Two days ago, my forecast low Friday was 6.  At last check it had risen to 11.  My guess is that it keeps climbing.

 

The storms might be trending north lately because the cold air is trending north of where first modeled.

Yup, That's exactly what's been happening. 5 days ago this upcoming cold shot for tomorrow and Friday was much colder looking. Now it has become a quick 24 shot. Most of the region gets above freezing Friday afternoon. All the modeled cold in the long range is way overdone. Sure it will be cold, especially relative to averages because they are starting to get warmer, but anything extreme is very suspect. I agree with you that the storms are responding accordingly.

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Every cold shot lately is modeled too strong at a distance.

 

Last Friday, my forecast temp Tuesday morning was 1.  It was 17 in reality.

 

Two days ago, my forecast low Friday was 6.  At last check it had risen to 11.  My guess is that it keeps climbing.

 

The storms might be trending north lately because the cold air is trending north of where first modeled.

probably due to an over forecasted block and an under forecasted +NAO

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Eh, somewhat overstated it, but we did have a solidly -AO at times, and relative to this winter, it was pretty mega. I dont think the general public would have ever been made aware of "Polar Vortex"  without the AO being pretty negative at times(and social media of course). 

 

We had an illusion of a -AO despite the scale being positive most of the winter.

2.029 1.475

2014 -0.969 0.044 1.206 0.972 0.464 -0.507 -0.489 -0.372 0.102 -1.134 -0.530 0.413

 

Dec 2013  1.206

Jan 2014  -969

Feb 2014  .044

March 1.206

 

March had that linkage from the EPO into euro pushing cold air over the top all month, so it was an illusion of an -AO. Only one month was negative last year

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We had an illusion of a -AO despite the scale being positive most of the winter.

2.029 1.475

2014 -0.969 0.044 1.206 0.972 0.464 -0.507 -0.489 -0.372 0.102 -1.134 -0.530 0.413

 

Dec 2013  1.206

Jan 2014  -969

Feb 2014  .044

March 1.206

 

March had that linkage from the EPO into euro pushing cold air over the top all month, so it was an illusion of an -AO. Only one month was negative last year

Thanks. Yeah I went back and looked. "illusion" is a good way of putting it.

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Lol 84hr nam analysis

In this pattern, I'd bet 100% on the NAM at 84 hours.  It shifted north last time.  The NAM is an awful model and normally I wouldn't give a warm bucket of piss about it, but this year, it's 100% right.   It's not like everything else hasn't shifted north.  That's how it goes. I just want this to be over.  You all should hope for a +NAO and a SE ridge at this point.  I know I do.   Don't care who is mad about it, this sh*t is for the birds and yet yall do it over and over.

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In this pattern, I'd bet 100% on the NAM at 84 hours.  It shifted north last time.  The NAM is an awful model and normally I wouldn't give a warm bucket of piss about it, but this year, it's 100% right.   It's not like everything else hasn't shifted north.  That's how it goes. I just want this to be over.  You all should hope for a +NAO and a SE ridge at this point.  I know I do.   Don't care who is mad about it, this sh*t is for the birds and yet yall do it over and over.

oh my an experienced person in maryland, well said.

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To me the big slow idea is still probably wrong. There's no great reason for it. De-slow it and it's a real snoozer for us.

 

yes...usually these things consolidate into one main system...which unless it switches back to those older runs where the 2nd system catches up, will probably be warm/mix

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