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Mid to Long Term Discussion 2017


buckeyefan1

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1 minute ago, NCSNOW said:

Good trends tonight. Thanks Grit, nc_hailstorm and jon for pbp.

NP. Thanks grit for the Euro PBP! Stormvista is fast. lol

Huge trends, EPS should be good considering the differences at 500mb when comparing 12z to 00z tonight...worlds apart. 

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Warning...lots of images, but...

Key feature in 00z GFS being a blockbuster is a slower progression of the wave east, doesn't actually start moving out until 140hrs or so...allows it to narrowly miss the ridge that builds over Texas, allowing the s/w to stay suppressed and eventually bomb out.

eneQ5Bb.gif

 

Euro also has the ridge, compare the 00z GFS with the Euro

P1SsRnJ.png

KbrpmYv.png

 

Then look at the 18z GFS and the 12z Euro from yesterday

 

18z GFS

ko08u8n.png

12z Euro

mLcQ8s4.png

Feature also present in latest CMC, albeit west.

YKvx7oV.png

 

 

and the GEFS ensembles

LnvSdNI.png

 

versus the 18z GEFS ensembles

T214Se4.png

 

Not sure if it actually matters, but it's a trend I'm seeing build on the modeling...it's late, forgive me. This may actually end up being a bad thing in the long run if the energy hangs out west too long. Something to watch on the means. I have no doubt the EPS will produce a decent ridge over Texas around 1/8, good news is no SER with this feature.

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RAH discussion:

The forecast for the end of the week has become increasingly
uncertain. In previous days, the models depicted a broad, positively-
tilted trough aloft from a vortex near Hudson bay WSWwd to the West
Coast, and a flat subtropical ridge centered across FL and Cuba.
00Z/31 guidance maintains the vortex near Hudson Bay, but now
separates an upper low from the positively-tilted trough, which
meanders near the Pac NW coast, while the rest of the trough
progresses into the Ern U.S., poleward of a much more suppressed
subtropical ridge well into the Caribbean.

Related differences at the surface now favor a more prominent/bodily
Ewd movement of arctic high pressure from the Plains to the
Appalachians --suggestive of cold and dry conditions Thu-Fri--
whereas the previous solutions favored a more elongated arctic
surface high that remained centered over the Rockies/Plains, and
allowed for moisture return into a milder regime across the
Southeastern and Middle Atlantic states. Given this recent
significant change in guidance, this forecast package will simply
trend toward a drier and cooler end of the week
.

**looks like RAH is at least going for the colder look.

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This is what happens when I start to doubt things and take a break...

0z GFS jumped right back closer to its runs a couple of days back with a strong PV establishing the cold and building HP over the east.  It keeps the first wave intact to give us a nice one. 6z weaker and more sheared out but it's there.

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6 hours ago, griteater said:

192 - weak pac waves shearing out into S Plains.  850 0 deg from Georgetown, SC to Memphis to S Oklahoma.  Initial sfc high is off MA coast, but strong now positioned over MN.  Very light snow in W TN to northern half of SC

I still believe suppression is the least of our worries.  In this pattern I will take my chances with the euro and ukmet. This has room to come north in future runs.

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4 minutes ago, odell.moton said:

Is it me and maybe I'm looking at it wrong but the gfs this morning has seem to back off of the snow it was showing last night


Sent from my iPhone using Tapatalk

You're correct ... moisture is lower on 06z run. Look for flucuations like this until things can get sorted out.

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