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2/14-2/15 Potential Major Winter Storm


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1 minute ago, Stebo said:

There is going to be a lot more ice than the nam is showing if it's running into as cold of atmosphere that should be in place. Also too the low looks too far north in relation to the 500mb maps. Lastly Nam at this range cut last night's storm through the state only to be spectacularly wrong.

Took the words right out of my mouth, but still concerned lol.

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12 minutes ago, roardog said:

If anything close to the Nam happened, there would be drifts to the tops of houses around here with the amount of snow already on the ground. lol

I wanna see some of that!

APX with a graphic for 6+ but not mentioning this "storm"

1295706267_2025-02-13APXGraphic.png.2dc18c95c62b89cc9f6b0d1e242e0823.png

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Klot not biting yet...great write up

 

Saturday through Thursday:

In the wake of the lead shortwave trough and slug of warm air
advection driven precipitation Friday night, attention will turn to
the large positively tilted upper trough moving across the
region Saturday and Saturday night. The 12z operational ECMWF
and GFS both depict precipitation breaking out somewhere in the
region Saturday afternoon and evening near the northern terminus
of the vort max associated with this trough.

While the "look" of the QPF in the models suggests the presence
of a developing TROWAL-driven deformation zone, that doesn`t
seem to be the case with still an open wave at 700mb and a very
baggy, weak closed low at 850mb. A deeper dive into what is
driving this precipitation points toward some progressive mid-
level frontogenesis, with some pretty substantial differences
among the models and their respective ensembles regarding the
placement of this QPF with non-trivial number of EPS and GFS
ensemble members dry along with the 12z NAM. ECMWF and GFS both
show a brief window of favorable upper jet support as 300mb jet
streak on the leeward side of the trough strengths, but then our
area quickly ends up in the convergent left entrance region of
the jet.

Hard to rule out some mesoscale driven banded beefier precipitation
developing associated with the corresponding mid-level front. The
GFS does show some rather strong transient 700-500mb frontogenesis
over the region Saturday afternoon and evening. The operational
ECMWF would suggest a flaring up of f-gen driven precipitation
Saturday evening, which would stand a better chance to be snow,
which could theoretically prove to be a better chance at some
accumulations as temps would colder by then.

The other realistic scenario for Saturday into Saturday evening
would be very little measurable precipitation with just some
drizzle and/or freezing drizzle. Given the exceedingly low
confidence, opted to stick with straight NBM output which has
snow and rain across the area Saturday afternoon and Saturday
night. The categorical (>80%) NBM pops are higher than what I
would have gone with, but confidence is lacking to lower them,
particularly with so many models showing precipitation.

By late Saturday night into Sunday morning, polar front jet is
progged to begin phasing with the subtropical jet with a healthy
northern stream shortwave digging into the backside of this
trough. Steepening low-level lapse rates in the strengthening
cold air advection regime along with this approaching trough
could set the stage for some snow showers late Saturday night
into Sunday, mainly the first half of the day.



- Izzi
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2 hours ago, sbnwx85 said:

I need that NAM run about 25 miles southwest. Splits my county in half between 9" of snow to the north and 3" to the south.

Watch it get so amped and screw us. Ha. I would give my right testicle for 0z nam to verify. Definitely steps in right direction. Hoping it continues on models tomorrow. But still feel jackpot may be I80 north. Peoria has nearly a 13in deficit. I need this. Lol

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Euro is about 5 to 6 millibars weaker with the surface low compared to the GFS. Takes about the same path though. The good news: that surface low on the 00z Euro is stronger than on the 12z Euro. Overall, it’s a step in the right direction.

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1 hour ago, Cary67 said:

Speculation on how far NW this could step?

With this trending evolution, we're probably looking at a Des Moines-Dubuque-Madison-Sheboygan-N/L Michigan northern max, for the heart of a potential snowfall axis.

The bigger concern would probably be an added trend to this new evolution, which would result in SE shifts or a slower evolution until late (See the 0z UKMET).

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7 minutes ago, sbnwx85 said:

Euro is about 5 to 6 millibars weaker with the surface low compared to the GFS. Takes about the same path though. The good news: that surface low on the 00z Euro is stronger than on the 12z Euro. Overall, it’s a step in the right direction.

Euro wanting to always crush dreams. It couldn't play nice and jump on board. 0z very encouraging but I'm still remaining highly skeptical. Hopefully models continue this tomorrow. 

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