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February 14th-16th Winter Storm Threat


Thundersnow12

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Haven’t started a thread in years it seems like so figured why not. 

I am almost more interested in this system over the early week system given the ceiling for this one looks to be much higher with a lot of potential. 

Model guidance been showing this system for a few days now in some fashion and 0z runs so far took it up a notch. Obviously a lot to work out but the baroclinic zone ahead of this potentially ejecting wave looks very impressive as modeled currently. 

I did a write up for ISC this past Tuesday about this pattern potentially being very active and snowy so it’s nice to see models latching onto ideas of bigger systems. 

http://www.illinoisstormchasers.com/forecasts/middle-of-february-could-turn-very-active-with-multiple-snow-systems-potentially-affecting-illinois

 

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I am somewhat concerned with the amount of moisture on some models being oversold. There's only a short turnaround between the system on Tuesday and the next one arriving late Thursday. I just don't there's enough separation in between them to seriously entertain the idea of a high-end moisture laden system like the GFS and CMC are showing. The lee cyclogenesis with this system is impressive, however, with some models bottoming out in the mid 980s. So even if the moisture is being overdone, this could still be a significant system in the wind department.

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35 minutes ago, hlcater said:

I am somewhat concerned with the amount of moisture on some models being oversold. There's only a short turnaround between the system on Tuesday and the next one arriving late Thursday. I just don't there's enough separation in between them to seriously entertain the idea of a high-end moisture laden system like the GFS and CMC are showing. The lee cyclogenesis with this system is impressive, however, with some models bottoming out in the mid 980s. So even if the moisture is being overdone, this could still be a significant system in the wind department.

I disagree. The cold front sweeps into the GOM early-mid week but it does become wide open for business pretty quickly as the high moves off the SE coast allowing for favorable trajectories. There is an impressive baroclinic zone being modeled, very warm 850s to the south of the front and PWATs well over an inch get into the southern Midwest and dews in the mid 50s advect up the Mississippi River.

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6 minutes ago, Thundersnow12 said:

I disagree. The cold front sweeps into the GOM early-mid week but it does become wide open for business pretty quickly as the high moves off the SE coast allowing for favorable trajectories. There is an impressive baroclinic zone being modeled, very warm 850s to the south of the front and PWATs well over an inch get into the southern Midwest and dews in the mid 50s advect up the Mississippi River.

Not to mention it doesn't dig too deep into the Gulf and the pattern is fairly zonal and progressive. The deepest part of the Gulf goes untouched.  If this continues on the north side of the baroclinic zone is going to clean up this month in snow.

Every front that gets into the Gulf including the one associated with this system only gets about half way in, then goes back north. The Southern part of the Gulf remains with dp above 70. I would say in a pattern like this if we rolled forward a month would be gangbusters for severe weather. Even at face value I would expect some severe with the next couple of systems across the south.

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I remember as a kid in Toledo watching it down poor rain for hours and then all of a sudden, in the middle of the night, it switched to snow and we picked up 10".  I don't remember what the actual storm did, but i'm guessing it was a situation similar to what this one could do.  Pulls cold air in as it strengthens going by to one's south.  I'm not foretasted to be in that area, but with some changes occurring with other telleconnections suggest this one may trend south as we progress through the week.  We shall see!  

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Love this! .... from Izzi ...
 

Quote

the Thursday/Friday time frame. Highest confidence aspect of the forecast for this system at this distance is that what the medium range models are showing now should change, possibly multiple times, over the next couple/few days.

 

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If it was beyond 10 days I would understand, but a high-end storm at 5 days out shouldn't just go away. Have the models always been this bad or is it something I've just noticed within the last couple years? Still it seems like the only big dogs whether winter, severe or tropical anymore are relative sneak attacks (like Michael for example, about 36 hours before landfall I along with most other weather watchers both amateur and professional thought mid-range Cat 3 was a reasonable ceiling if everything went right for the storm).

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