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Feb 17/18 Storm Threat - Discussion


mahk_webstah

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Yeah, that appears that could be a big hit on the op. GFS from 00z when considering it has progressive bias; correcting for that, its 72-hour position could be corrected a bit SW.  Not solid

 

There is quite a bit of FGEN one the NW side of the low. -10c and -20c squeeze very close together over Maine at 75hrs.

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How much do you usually correct SW to counter the bias?

-skisheep

 

Relative to this run ... the surface and 500mb level cores, about mid way between that positions S of NS at 72 hours, and Cape Cod, give or take.  There may be too much convective dump into the max deepening on the GFS as well...  causing it to swing violently NE into the geopotential medium (heights)

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The NOGAPS even has a big hit for SNE although it develops the wrong low it seems, develops a low off the lead wave that gives some snow to DC/PHL it appears

 

 

Yeah it almost looks like some of those big 12z solutions with how it handles the low. Monster hit though for New England on the NOGAPS.

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So so far in 0z we have UKIE/NAM vs GFS/RGEM/GGEM. Inclined to pick the latter combo, since the NAM has been useless and the UKIE not much better, but hesitant to toss the UKIE considering it was the model that held onto this when everything else lost it. EURO will be huge, if it's GFS/GGEM like, we've got ourselves a storm on our hands, NAM/UKIE like, we've got ourselves some model mayhem on our hands. Basically I'm taking the EURO, when the solution is split, the side it's on usually(but not always) wins.

-skisheep

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So so far in 0z we have UKIE/NAM vs GFS/RGEM/GGEM. Inclined to pick the latter combo, since the NAM has been useless and the UKIE not much better, but hesitant to toss the UKIE considering it was the model that held onto this when everything else lost it. EURO will be huge, if it's GFS/GGEM like, we've got ourselves a storm on our hands, NAM/UKIE like, we've got ourselves some model mayhem on our hands. Basically I'm taking the EURO, when the solution is split, the side it's on usually(but not always) wins.

-skisheep

 

Add the Nogaps in the GGEM camp.

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Wow, GEFS are pretty amped...just a tick E of the benchmark on the mean and potent too. Not waiting up another 5 minutes for QPF though...here's hoping the Euro comes in nice.

 

It's hard to imagine.  The 12hr advantage is huge, especially when discussing a storm this close, and the majority of them too (00z gfs has more skill at 48 hr than the 12z euro at 60 hr).

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Nice, so 4 against 2 now. Throw the 2 useless ones out(NAM and NOGAPS), and it's 3 against 1, although the star player has yet to pick a team.

-skisheep

NOGAPS is soon to be replaced by a better model called NavGem.  It might explain why they haven't made an upgrade on a system that received its last major upgrade in 1998.  NavGem, for some reason, was supposed to go into operation the same day (yesterday) and the Canadian upgrade, and NoGaps will be phased out.

 

 

ETA

 

https://www.fnmoc.navy.mil/wxmap_cgi/cgi-bin/wxmap_DOD_area.cgi?area=fnmoc_namer&set=All

 

NavGem is here...

post-138-0-54078000-1360905534_thumb.gif

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NOGAPS is soon to be replaced by a better model called NavGem.  It might explain why they haven't made an upgrade on a system that received its last major upgrade in 1998.  NavGem, for some reason, was supposed to go into operation the same day (yesterday) and the Canadian upgrade, and NoGaps will be phased out.

 

It already has been replaced.

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