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February 19-20 Major Winter Storm Threat


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There will likely be an area of enhancement in NE NC/SE VA as the SLP strengthens. This is due to the PJ wave dropping in behind and re-energizing it. We've seen this scenario many times. THe GFS/EURO/GGM are all showing it now. Also the models have clued in on the strength of the blocking and are now shunting this OTS after hitting NC/VA which does make a lot of sense when you look at the broad pattern below:

 

1739955600-9W0BPLJStpo.png

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The GFS, though still the warmest at mid levels, continues to chisel away at the warm nose from below. You’re starting to see the ZR area collapse and more sleet. This was discussed the past few days as a trend with miller-As and we’re now seeing it on the model. What was once a thick warm nose across a lot of the piedmont is now looking like a relatively narrow transition zone (expected) with more sleet than ZR

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19 minutes ago, HKY_WX said:

The worries regarding QPF will be short-lived when we get into the short-range. Especially given the consistency of the EURO with totals over 1". TheSTJ wave is amplified and doesn't shear out. It will likely be the opposite as the PJ wave drops in behind it and phases with it. How close to the coast is the million dollar question. Precip type is still the main issue in my mind for NC and where the SN/IP/ZR lines setup. That's still very much in question. As the models resolve the track of the low, the mid-levels (900mb-700mb) will be impacted and dictate that.

So are you thinking QPF will increase as we get closer to the storm vs the model QPF output we are seeing now? Once the models figure out the exact track of the low pressure will we see this translate to more of a widespread precip on the surface maps?

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20 minutes ago, GaWx said:

12Z CMC qpf: RDU 0.5-0.6” all wintry is a major winter storm there

IMG_3023.thumb.png.0f6c25de7e049974aa560179e0a3d2c3.png
 

sleet: a lot parts of E NC

IMG_3025.thumb.png.b2047aeeddb4e9ffd2019bce1d5a5cd6.png

I’m not going to speak for everyone bc the storm has definitely trended a little weaker and this is an IMBY post but RDU has probably been the biggest benefactor of trends since yesterday. It’s gone from a plain rain/ice look to crippling ice storm to now better chance of a sleet/snow event. QPF has gone down but I can speak for everyone when I say we’ll take that as a trade off for colder mid levels. Now we don’t want this to trend strung out but imo thats not likely. It wants to strengthen on the coast. Starting to think the triad-southeastern VA and the top two counties of NC below the border will be the sweet spot. There will likely be a nasty cutoff south of there. Not buying the all snow idea in Raleigh unless drastic changes occur the next couple days, it will be a mixed bag 

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8 minutes ago, WXNewton said:

So are you thinking QPF will increase as we get closer to the storm vs the model QPF output we are seeing now? Once the models figure out the exact track of the low pressure will we see this translate to more of a widespread precip on the surface maps?

I've just observed a bias this winter on the GFS specifically where it shears out STJ s/w's too quickly. It will likely be wrong with what it's currently showing. It doesn't make much sense in comparison to the pattern aloft. Eastern areas will see more QPF than western areas just by nature of being closer to the moisture source, but there will also be mixing issues further east. The only way I could see this busting for western NC is if the lead wave does indeed shear out/trend weaker and the main show is associated with the Atlantic low as the PJ re-energizes it. That said, I would need to see the EURO show this and it hasn't up to this point.

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12Z UK: slightly colder vs 0Z with RDU area near snow/sleet line vs almost all sleet on 0Z early. Thus, the snow maps on Pivotal for N Wake county should be pretty accurate this time for 10:1. S Wake: not quite as accurate

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7 minutes ago, Brick Tamland said:

Right now it looks like the Canadian. UK and Euro vs the GFS as far as more snow versus ice for Wake and points north in NC. That is if the current Euro run holds serve.

Yeah but we can we really trust the Canadian?  They booed our national anthem. 

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12 minutes ago, Brick Tamland said:

image.thumb.png.9c7e918b5df6511c8cbb8ff95c2dc92a.png

Thanks, Brick. For Fayetteville, that 2.9” is really mainly 0.7” of ZR/icestorm with 850s +3+ and sfc temps starting near 32 and falling to high 20s.

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Just now, NorthHillsWx said:

I’ll take my 2-4” glacier and call it a season lol. Very bad trends west of triangle and in most of Virginia 

A hell of a year for the I-95 corridor in the central eastern/northeastern part of the state. Probably the best winter in decades if this one pans out. 

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If this keeps up, its going to be an central/eastern NC/VA Snowstorm special. Crazy trends the last 24 hours. Models are feeling the push of the blocking in Canada. Prepare for crazy NAM/HRRR runs the next couple nights. Get your whiskey ready.

 

 

EC Trend.gif

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