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March 6-8th Ocean Storm Discussion Part II


free_man

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The countdown to NCEP guidance caving begins...will it be 12z?

 

It looks like the Euro/GGEM/Ukie are all in pretty close agreement...some minor differences aside...the SREF/GFS are in the other camp. NAM I won't even discuss yet as it is likely to show a whiff and a full blown blizzard at some point in the next few runs, though its 06z solution was kind of in the middle of the two camps.

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The countdown to NCEP guidance caving begins...will it be 12z?

 

It looks like the Euro/GGEM/Ukie are all in pretty close agreement...some minor differences aside...the SREF/GFS are in the other camp. NAM I won't even discuss yet as it is likely to show a whiff and a full blown blizzard at some point in the next few runs, though its 06z solution was kind of in the middle of the two camps.

At least we all are on the same page with the NCEP products being "out to lunch" for the most part with this one.  Funny, we all hope they are correct though.

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GFS is probably getting over phase happy with the NE energy. All models actually have it, but GFS just take it to an extreme and nearly threatens the BM with the track. NAM doesn't look terrible. Its actually pretty close to the EC ensemble solution

Will, yeah I'd agree. My only point on the op Euro is that it's as predictably underamped as the GFS is overamped but the majority tends to view overamping as a bigger crime vs being too suppressed. To me long as the tendencies are known one can adjust which I think is what NCEP has wisely done to this point in going 2/3 Euro, 1/3 GFS.

I think these two Euro maps are only 1 run apart. The heavier precip and the low came a lot further north. Still nowhere near the GFS but the sensible impacts on the SE coast are significantly different. A tick of the op towards the Ens and it's even moreso.

I view the breaking down of ridging over New England as the largest and most debatable (unlikely) aspect of the GFS.

That said one thing should be mentioned which is the RGEM moving pretty dramatically towards the idea of a m/l feature spinning through New England. You can see the changes in the RGEM in just 6 hours below. I don't follow the off hour CMC guidance very closely but it's an interesting change and a total break towards the GFS idea of separating the two as they try to exit our region.  It's also faster with the main feature coming through the TN valley.

post-3232-0-48674100-1362403344_thumb.jp

post-3232-0-14797900-1362403356_thumb.jp

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I am not sure which scenario Kevin is looking forward to more, the Gfs being wrong and going on a 24hr gfs bash~a~thon or it being right and getting a snowstorm but having to put the gfs bashing on the back burner for yet another year?

:)

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I'm with Rollo on this one, either way is there a meteorological reason the GFS can't be right besides is the gfs?

Well, quite a few here have spelled out exactly why we think the GFS is incorrect.  I'm not bashing it, just not taking it's solution serious in this scenario.

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toggling the Euro 850 winds it came North 100 plus miles from 12Z. this certainly is an interesting storm to track.

 

The RGEM made a significant departure towards reduced heights on the 6z run.  If it went beyond 48 hours I suspect it would have been much farther north than the earlier runs.  NavGEM edged a little north too, not much but enough to clip NYC or close to it.

 

I'm with Rollo on this one, either way is there a meteorological reason the GFS can't be right besides is the gfs?

 

I think the entire winter the GFS has overdone every system that was progged as a fringe job by the others.   But the Euro has been predictable the other way.  Figuring out where the middle ground will be is the difficult part.  The GFS has done a good job at sniffing out the northward potential but is always overdone.  Maybe this is the time that it isn't, but a forecaster would be nuts to believe that until it's supported by something else.

 

We have always heard the Ensembles being NW of the OP Euro at this range as a red flag for later N movement.  If we took 2/3 Euro and 1/3 GFS ensembles it's a good hit.  If we took 2/3 euro and 1/3 OP models it's a decent hit.  NCEP elected for the latter, and as a result has a decent amount of QPF into New England.  It won't work that way though, one camp is about to cave towards compromise, I think the euro ENS are a good place to start for now.  The discussion I have about the GFS being right is mainly academic over whether or not it should get more credit than it does for sniffing out systems but being predictably overdone.

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Will, yeah I'd agree. My only point on the op Euro is that it's as predictably underamped as the GFS is overamped but the majority tends to view overamping as a bigger crime vs being too suppressed. To me long as the tendencies are known one can adjust which I think is what NCEP has wisely done to this point in going 2/3 Euro, 1/3 GFS.

.

Over-amping is worse because of the potential impacts to a large population that solution has in this case. Out to sea is out to sea regardless of whether its too suppressed or not. The impact is generally the same for most in terms of sensible weather.

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I am not sure which scenario Kevin is looking forward to more, the Gfs being wrong and going on a 24hr gfs bash~a~thon or it being right and getting a snowstorm but having to put the gfs bashing on the back burner for yet another year?

:)

I so want it to be right. More than anything. We all do. But there's realism and fantasy
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This whole thing just makes me feel uneasy. If the GFS caves substantially...that's a big disappointment in the model when every ensemble has a sig hit 72 hrs out. 3 days is not an eternity. I expect the euro to come north a bit anyways. I would welcome a 50/50 split for sure and say I was wrong.

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This whole thing just makes me feel uneasy. If the GFS caves substantially...that's a big disappointment in the model when every ensemble has a sig hit 72 hrs out. 3 days is not an eternity. I expect the euro to come north a bit anyways. I would welcome a 50/50 split for sure and say I was wrong.

If the GFS caves substantially to the euro that would be a horrible fail for a D3 solution. The gfs even figured sandy out by 72 hours.

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