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Southeast February Mid/Long Range Discussion II


Marion_NC_WX

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Kind of hard seeing this coming much further west than the 12z Euro run, that was running up along the coast. There appears to be another system coming in the west which is going to push everything east, at least that's what I see happening, but I guess if we get a super phase it could.

12zgfsensemble500mbHGHTNA120.gif

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Classic split stream system on the Euro. Get ready for runs and runs of waffling with the rain/snow line. Taking the storm track litrally and accounting for model biases and their usual lack of underestimating dynamical cooling, this is borderline for RDU with probably my house in NE Raleigh getting a rain/snow mix and western parts of the Triangle and the western piedmont/foothills/mountains doing well, like someone mentioned earlier a Dec 2009 type event, where I literally saw 30 minutes of snow mixed with rain and then rain and 33.

Anyway, folks all options are on the table with this system and with the lack of strong CAD and it being mid February, it will be all dependent on the track and dynamics for who gets the snow. The GFS is a strung out mess, the Canadian is further south than the Euro. So hopefully we get a fun week of tracking.

Is this the event that is being talked about?

namussfc2009121812.gif

It looks like this was mostly a rain event for KCLT. Hickory had a mixed bad of precip, with a mostly SN event for the mountains. Setup looks similar to what the models are hinting at.

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Is this the event that is being talked about?

namussfc2009121812.gif

It looks like this was mostly a rain event for KCLT. Hickory had a mixed bad of precip, with a mostly SN event for the mountains. Setup looks similar to what the models are hinting at.

Yeah, that's what I was thinking too, wonder how we can get the 5h maps of this, very curious to see what the west looked like and where exactly the 50-50 low, looks like there was one.

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wxwatcher91 from NE thread has a great write up on all the players on the table, looks very complicated.

http://www.americanwx.com/bb/index.php/topic/32665-219-east-coast-winter-storm-threat/page__view__findpost__p__1367521

Good find, I am just going to quote his post over here if that's ok... Even with so many pieces involved in the overall evolution of a potential storm next weekend, interesting that a somewhat consistent solution has held serve; Gulf low moving to somewhere off the SE Coast.

The last 24 hours of model runs have certainly had a few interesting outcomes / trends.

A number of factors here that need to be considered for this forecast problem.

1) The Friday trough ... amplitude, speed, etc. ... that is our "50/50" low

2) Shortwave diving through the Midwest around the same general vortex on Saturday morning 2/18

... some model runs actually keyed in on this s/w to phase (or attempt phasing) with the southern energy

3) More s/w energy in Manitoba within the west side of the vortex that may or may not amplify into a lobe off the vortex.

... this is where the vortex gets stretched, which is a decent idea considering upper level flow on the south side of the vortex accelerates from ~40kt over the Midwest to 150kt+ blasting off the east coast.

4) The southern energy ...amplitude, speed, etc. ... pretty classic Gulf coast low in formation on all the model guidance.

5) Shortwave in the Central Plains Saturday morning

... this has generally been the "popular choice" for the models at this point for the key northern s/w.

6) Shortwave upstream of (5) in southern Canada

... I think a few runs this weekend wanted to key in on this one, but that idea has flown. Now the Euro wants to phase it into the western vortex energy (3)...

7) Another pesky s/w coming onshore in the west kicking things eastward, and preventing an amplified western ridge.

shortwaves.png

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Yep that last panel looked good. Makes you wonder what craziness the DGEX is going to spit out this evening.

Literally, ~1' for areas in and around Danville - Richmond, SE VA gets crushed too

18zdgex850mbTSLPp06_county144.gif

850 low track, N GA through the upstate to near RDU then east of ORF, good for NW NC, southern 1/3 of VA, great track for Richmond

18zdgex850mbHGHTUS144.gif

18zdgex850mbHGHTUS150.gif

DGEX though, but obviously not an outlier

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One thing to point out, as we approach spring, the length of day is getting longer(+2.03 min each day as of today). Which means, the angle of the sun in relation to the ground is increasing. We have gained about a hour of daylight since the Winter Solstice. If snow happens during the day, ratios could be impacted by the sun.

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often heard you can't trust the 18z

Statistically, there is very little difference between any of the model runs. Of course, if one looks at models every six hours, he can certainly get a little information overload, though!

Anyways, this looks like something interesting to track, for sure. I hope it comes far enough east to get Raleigh, but if not I will definitely be heading home this weekend if GSO looks like it's going to get hit.

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Generally a good sign when the euro picks up on it day 8-9 loses it and then it comes back day 5-6. Looking like this may be the one to watch. Am interested to watch tonight as this system comes in. Wouldn't be surprised at all to see a nice dusting-inch in a few places.

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Quick glance, about half of the 18z mems are big hits for the 95 corridor, DC - BOS, even a couple mid-low 970's super bombs in there. Don't really see any that look good for the SE, mainly a VA north deal based on a simple consensus. Still several more days of back and forth, would not be surprised to see this trend towards a big hit for our friends up north if the phasing potential is realized. Also would not be surprised to see it slide OTS, not really impacting areas north of VA as a phase takes place too late or not at all. Temps are certainly dependent on track (and strength), I don't like that pesky area of low pressure showing up on some of the models near the great lakes. If that energy can somehow play out differently, I could see high pressure wedging into the great lakes/OH valley area from the northern plains, aided by the flow in SE Canada, that could possibly be a source of cold air that does not start showing up until 3-4 days out.

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Quick glance, about half of the 18z mems are big hits for the 95 corridor, DC - BOS, even a couple mid-low 970's super bombs in there. Don't really see any that look good for the SE, mainly a VA north deal based on a simple consensus. Still several more days of back and forth, would not be surprised to see this trend towards a big hit for our friends up north if the phasing potential is realized. Also would not be surprised to see it slide OTS, not really impacting areas north of VA as a phase takes place too late or not at all. Temps are certainly dependent on track (and strength), I don't like that pesky area of low pressure showing up on some of the models near the great lakes. If that energy can somehow play out differently, I could see high pressure wedging into the great lakes/OH valley area from the northern plains, aided by the flow in SE Canada, that could possibly be a source of cold air that does not start showing up until 3-4 days out.

Yeah, just looking too, I imagine our NE friends are liking that. That energy over the lakes would be a deal killer for us.

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often heard you can't trust the 18z

Statistically, there is very little difference between any of the model runs. Of course, if one looks at models every six hours, he can certainly get a little information overload, though!

Anyways, this looks like something interesting to track, for sure. I hope it comes far enough east to get Raleigh, but if not I will definitely be heading home this weekend if GSO looks like it's going to get hit.

Load of info on this subject. tl:dr no difference in 18Z and 6z vs 0 and 12Z

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From all my years of experience posting on these boards and following the models, I can tell you that the one thing I hate is an RIC bullseye 6 days out. It has happened before and never works out.

We're sort of outcasts here. Don't really fit in the MA thread nor this one. Here's hoping we all get in on the action though!

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From all my years of experience posting on these boards and following the models, I can tell you that the one thing I hate is an RIC bullseye 6 days out. It has happened before and never works out.

We're sort of outcasts here. Don't really fit in the MA thread nor this one. Here's hoping we all get in on the action though!

No one ever wants to be bullseye outside of 24 hrs

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From all my years of experience posting on these boards and following the models, I can tell you that the one thing I hate is an RIC bullseye 6 days out. It has happened before and never works out.

We're sort of outcasts here. Don't really fit in the MA thread nor this one. Here's hoping we all get in on the action though!

Your in a good as spot as any, if this phases and really hugs the coast NE you would think RIC would still do good, if it misses the phase and is OTS then nobody is going to get hit so what does it matter. If I could pick one spot to be in I would probably pick Richmond.

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