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January 8th-9th threat


BullCityWx
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There's a whole lot going on with respect to the strength and track of the wave based on how it interacts with the upstream kicker wave coming into Colorado behind it and the configuration and strength of the downstream 50/50 low with various spokes rotating around it (pretty typical though with model wars and how they are handling pieces at 500mb).

For 00z, the UKMet is well south with the track of the wave thru GA like the GFS v16, but the wave is strong and it has more amplitude, which can be seen by the 558 height line reaching up just to the south of Long Island.  Wave on the GFS's doesn't have as much amplitude there

dzQRO2P.png

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2 minutes ago, wncsnow said:

Euro looks very similar to 12Z run

It looks similar to GFS v16 at 500mb, just not as strong.  Spoke revolving around the 50/50 low drops due south into NY/VT, and that collapses the amplitude of the height field off the Mid-Atlantic coast, so the wave just slides east off NC.  Who knows which model is correct, but the west to east slider like GFS v16 and Euro are what many in NC east of the Mtns and Foothills would want, and the more amped CMC/UKMet is what the Mtns/N Foothills/into VA would want.

29D8Pjt.gif

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This mornings nam run.

Nicely organized cut off ULL with a surface LP near Pensacola FL.

nam_z500_vort_us_29.png

Surface reflection has a primary near Pensacola with a secondary right off Jacksonville.

Very nice setup. 

Edit:

850lp. Near Pensacola.  Secondary off of Jacksonville. Baroclinic zone right at FL/GA line.

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47 minutes ago, FLweather said:

This mornings nam run.

Nicely organized cut off ULL with a surface LP near Pensacola FL.

nam_z500_vort_us_29.png

Surface reflection has a primary near Pensacola with a secondary right off Jacksonville.

Very nice setup. 

Edit:

850lp. Near Pensacola.  Secondary off of Jacksonville. Baroclinic zone right at FL/GA line.

As you know, that'll get 'er done. 

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GSP overnight long term discussion: 

 

.LONG TERM /THURSDAY THROUGH SUNDAY/...
As of 320 am EST Monday: The latest numerical model solutions
feature decent agreement on a strong, closed ~545 dm 500
mb low center spinning slowly east across the Deep South by Thursday
night. Deep moisture will return from the west through the day on
Thursday ahead of this system but with the best upper jet support
east of the low crossing the region Thursday night. The
associated 850 mb low center track is currently forecast to pass
just southeast of the western Carolinas on Friday, and this track
is a classical setup for heavy snow potential in and near the
southern Appalachians. With the surface wave likely redeveloping and
deepening along the southeast coast, a deformation zone
well northwest of the surface to 850 mb low centers will likely
produce strong frontogenetical forcing over our region at times. Any
banding of the precipitation could lay down very heavy snowfall in
affected areas, especially if the forcing pivots from west-east to
north-south as the low pulls away. For now, will keep precipitation
types as rain versus snow, but there could certainty be some mixed
ptypes issues with this system, especially on the onset side of the
things. An HWO mention for at least the mountains is certainty
worthy and any increase in confidence will require a mention out
along I-40 as well with below guidance temperatures featured.
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GSP overnight long term discussion: 

 
.LONG TERM /THURSDAY THROUGH SUNDAY/...As of 320 am EST Monday: The latest numerical model solutionsfeature decent agreement on a strong, closed ~545 dm 500mb low center spinning slowly east across the Deep South by Thursdaynight. Deep moisture will return from the west through the day onThursday ahead of this system but with the best upper jet supporteast of the low crossing the region Thursday night. Theassociated 850 mb low center track is currently forecast to passjust southeast of the western Carolinas on Friday, and this trackis a classical setup for heavy snow potential in and near thesouthern Appalachians. With the surface wave likely redeveloping anddeepening along the southeast coast, a deformation zonewell northwest of the surface to 850 mb low centers will likelyproduce strong frontogenetical forcing over our region at times. Anybanding of the precipitation could lay down very heavy snowfall inaffected areas, especially if the forcing pivots from west-east tonorth-south as the low pulls away. For now, will keep precipitationtypes as rain versus snow, but there could certainty be some mixedptypes issues with this system, especially on the onset side of thethings. An HWO mention for at least the mountains is certaintyworthy and any increase in confidence will require a mention outalong I-40 as well with below guidance temperatures featured.


The mention of heavy snow several days out is always nice.


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1 minute ago, BornAgain13 said:

Surprised no one commented on the 12z NAM and where it was heading...

It looks to have a nice result with the position of the upper low and surface reflection. Moisture looks a bit meager at 84 but should be fine. 

850hv.conus.png

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