Jump to content
  • Member Statistics

    17,508
    Total Members
    7,904
    Most Online
    joxey
    Newest Member
    joxey
    Joined

Jan 23/24 2016 obs/nowcast - the fight for the North


RUNNAWAYICEBERG

Recommended Posts

  • Replies 1.8k
  • Created
  • Last Reply

I think we need to be careful with the post mortem about this storm.

 

No denying the NAM performed pretty well, but I think a lot of people are getting sucked into the QPF. That is one of the most poorly modeled variables, so putting a lot of weight on it is more often than not going to lead you astray.

 

Go back in the forecast thread (maybe even the first one) and you'll see posts about why, despite the QPF the Euro showed, that the banding signal gave plenty of hope to SNE. We're talking around 5 days out.

 

So while the Euro QPF was too far south it's banding was north, and while the NAM QPF was north, it's banding was in line with the Euro. The forecasts weren't as far off as you might think.

 

Mid levels matter.

 

Yep. Good post. Look no further to last Feb on 2/15 when the mid levels screamed S+, but QPF was meh. Models will always be better with the mid level feature etc and QPF takes a back seat since it's prone to so man variables.

Link to comment
Share on other sites

Yea, OceanSt. Agree. There's different ways to look at it and also depends on which weenie backyard is being measured. But from a met standpoint ie model verification, you are correct. 

 

I did mention inside 48hrs that the euro was too far se with its qpf distrubtion but prob is right with his mid level evolution. While the nam was picking up on the meso features it was too far north with qpf prinouts. 

 

Once again, a blend was the way to go. If that seems like a cop out, oh well...i just think each piece of guidance has its strengths and weaknesses. Sometimes one model may technically scour a coup but I didnt think it happenned with this storm.  

 

Although I do believe JMA did pretty well lol. But we know its always hyping up big EC storms and this just happened to fall into its strengths. 

Link to comment
Share on other sites

Yea, OceanSt. Agree. There's different ways to look at it and also depends on which weenie backyard is being measured. But from a met standpoint ie model verification, you are correct. 

 

I did mention inside 48hrs that the euro was too far se with its qpf distrubtion but prob is right with his mid level evolution. While the nam was picking up on the meso features it was too far north with qpf prinouts. 

 

Once again, a blend was the way to go. If that seems like a cop out, oh well...i just think each piece of guidance has its strengths and weaknesses. Sometimes one model may technically scour a coup but I didnt think it happenned with this storm.  

 

Although I do believe JMA did pretty well lol. But we know its always hyping up big EC storms and this just happened to fall into its strengths. 

 

I don't think that's a cop out.

 

I think that's the way to lead into an event. If you take model QPF verbatim, you'll often get burned on the edges.

 

This is a great event to argue snowfall probabilities. I mean we all knew NYC had a chance for something big, but maybe you don't want to forecast it right away. So maybe you have a 50/50 chance of 18+ or something like that, despite forecasting 8-12".

Link to comment
Share on other sites

that Norwich number?

 

 

Yeah - I sort of groaned when I saw it but we actually got 2 reports from Norwich... one of 4" and one of 5" so maybe it's valid.

 

Also, there definitely was a sucker hole from Norwich SW to Westbrook/Old Saybrook. Only about 5" here.

 

Only 6.3" here so 5" (or slightly less) is totally possible NNE in Norwich...

Link to comment
Share on other sites

Wasn't around for this one so can't be sure of my total, but an averaging of the reports near me in the PNS, Logan's total, my estimates of the compacted snowpack and my roommates unscientific estimate comes to around 6", so that's what we'll go with. Nice to have everything whitened up and wintry for my return ;)

Link to comment
Share on other sites

If you tossed qpf.. And looked at just its Banding and fronto.. It was pretty damn good

 

 

It was quite good in the 48-72 time range in showing further north ML centers (which ended up being huge for NJ/E PA/NYC)...verbatim it was too far north though. But the other guidance was too far south...esp the Euro. It was barely getting PHL into the good ML fronto (and QPF on a few runs were even worse...but if you ignore the QPF, it was still barely getting that good zone into Philly).

 

For a few runs there you could say the NAM was 1 part too far north while the Euro was 2 parts too far south.

Link to comment
Share on other sites

It was quite good in the 48-72 time range in showing further north ML centers (which ended up being huge for NJ/E PA/NYC)...verbatim it was too far north though. But the other guidance was too far south...esp the Euro. It was barely getting PHL into the good ML fronto (and QPF on a few runs were even worse...but if you ignore the QPF, it was still barely getting that good zone into Philly).

For a few runs there you could say the NAM was 1 part too far north while the Euro was 2 parts too far south.

Yeah I think it's fair to say it outperformed the Euro by a fair amount.
Link to comment
Share on other sites

Yeah I think it's fair to say it outperformed the Euro by a fair amount.

 

 

For here it didn't...but if you look at the entire corridor from PHL to SNE, then I would agree. At least for that period when the Euro was well south...Euro did creep north at the end.

Link to comment
Share on other sites

If you tossed qpf.. And looked at just its Banding and fronto.. It was pretty damn good

 

Considering our forecast from 72 hours out pretty much worked out I'd say we did OK. 

 

There was definitely a signal that NYC/LI could get jacked and that the south coast would have to watch. No question about it. Up here I think it was pretty clear from the beginning that that was going to be really tough to do. 

Link to comment
Share on other sites

Considering our forecast from 72 hours out pretty much worked out I'd say we did OK.

There was definitely a signal that NYC/LI could get jacked and that the south coast would have to watch. No question about it. Up here I think it was pretty clear from the beginning that that was going to be really tough to do.

I think your teams forecast was good but you had huge doubts in here and posted in the first locked model thread that you thought IJD would end up drier and the south coast wetter. I understand how the forecast cycle works out but the signal for a bigger deal in interior CT was showing up.
Link to comment
Share on other sites

There are going to be a lot of disappointed weenies when they lock in the NAM for the next 10 storms and wind up with about 10% of the snow they're expecting.

What I learned from this storm were two things: first, that the NAM is a lot better than all of the other models and second, that models always underestimate QPF.

What was it you were saying?

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...