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January 5-6 Thing II: STORM MODE


stormtracker
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16 minutes ago, Newman said:

Only looking 36hrs out into the Ohio Valley, we're talking QPF differences of 1-2" in some locations between the HRRR (long-range, I know), the NAM, and the RGEM. The NAM and RGEM being drastically different arises from their depiction of the mid-level vort sliding through, of which the NAM is much more potent and neutrally tilted to allow for a healthy PVA regime, the RGEM is simply flatter and less robust. Looking at H5 trends between the two, it seems they are converging closer together without an all-out "fold" of one model to the other. I suppose we'll see, the Sterling NWS AFD is excellent if you haven't checked it out. Also to note... there are some timing differences to make note of, but not *that* large between these models to expect such huge differences

models-2025010418-f036.qpf_acc-imp.us_ov.gif.460927f713b28854d8d2b830e0d69c81.gif

Yeah this is absolutely nuts. This close to gametime, not sure I remember this much divergence. 

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2 minutes ago, stormtracker said:

All in all, doesn't seem to be anything different that jumps out.  Little less coastal enhancement

The vort weakens more than the 12z run which probably explains why its both colder and worse with the coastal. Result is a smidge colder and an asshair drier (for around DC at least)

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Just now, yoda said:

DC metro is all snow this run... no sleet 

 

Just now, BTRWx's Thanks Giving said:

I see the Low quite a bit south compared to 6Z.

 

Just now, LP08 said:

More expansive accumulation south, per snow maps

Cool.  I'll just wait for the WB snow maps.  F SV

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1 minute ago, SnowenOutThere said:

The vort weakens more than the 12z run which probably explains why its both colder and worse with the coastal. Result is a smidge colder and an asshair drier (for around DC at least)

This right here... You can see it on the H5 at H48 on the 18z... on the 12z it is still closed off... but no earth shattering changes... will be interesting to see the 18z Euro and the 0z suite.

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1 minute ago, WxUSAF said:

Perhaps a little betwixt the 850 and and 700mb lift?

Was expecting maybe a subsidence zone between the two maximas with how strong the h7 lift north and h85 lift south are on some of the CAM’s. Gfs is more like the American mesos and NAM than the south camp. Northern expanse of precip for m/d folks is better this run.  

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