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2023 Short/Medium Range Severe Weather Discussion


Chicago Storm
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7 hours ago, CheeselandSkies said:

That *is* a pretty powerhouse system being depicted on the NAM. Not too often you see tornado-favorable soundings valid for 15Z (10 AM) in this neck of the woods.

nam_2023072500_039_42.11--88.47.png

That’s what I’m saying pretty intrigued to say the least. DTX had a really nice discussion last night. Waiting on a more detailed one from KIWX 

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2 hours ago, A-L-E-K said:

friday evening looking solid

Was about to post on this but then got super busy at work (live severe wx cut-ins among other things).

Interesting tension among first whiff CAM solutions...3K NAM has a rather volatile :twister:environment over S WI/N IL at 00Z Friday Saturday, but no convection. FV3 meanwhile has a huge derecho blowing through.

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Just now, CheeselandSkies said:

Was about to post on this but then got super busy at work (live severe wx cut-ins among other things).

Interesting tension among first whiff CAM solutions...3K NAM has a very volatile :twister:environment over S WI/N IL at 00Z Friday, but no convection. FV3 meanwhile has a huge derecho blowing through.

It’s like pulling power ball numbers when it comes to what your gonna get this time of year. Been a fun past couple weeks

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18Z NAM at FH054 remains quite interesting for Friday evening at FH054 with very strong low-level curvature in the forecast hodographs, a modest/breakable cap, and >5,000 j/kg MLCAPE in parts of S WI/N IL.

The surface chart appears to depict the reason for these enhanced hodographs as a sort of secondary surface low near the MS river, out ahead of the main one which it depicts over the IA/NE border.

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4 minutes ago, CheeselandSkies said:

Kind of surprised SPC couldn't at least muster a 2% :twister:prob zone on the Day 2, given >100j/kg 3CAPE and 250-350 m2/s2 inflow layer SRH on NAM forecast soundings for 00Z Saturday, unless they're totally disbelieving the model; or don't believe storms will form in that environment.

In addition to that, the 12Z HRRR fires storms in southern WI Friday afternoon/evening, which last night's 00Z (first run to be in range) wasn't doing.

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1 hour ago, CheeselandSkies said:

Kind of surprised SPC couldn't at least muster a 2% :twister:prob zone on the Day 2, given >100j/kg 3CAPE and 250-350 m2/s2 inflow layer SRH on NAM forecast soundings for 00Z Saturday, unless they're totally disbelieving the model; or don't believe storms will form in that environment.

They introduced a 2% in the 1730Z update. MS River at WI/IL line to western third of Lake Erie.

Depending on MCV placement/timing, I could see tomorrow becoming one of those sneaky summer sig :twister:events for somewhere in our region. Given the forecast heat, LCL could become an issue, but dewpoints should be in the 70s. This could be a case where a little cloud cover might actually help if you're looking for a chase.

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1 hour ago, SolidIcewx said:

May 8th 2009 style?

Tomorrow looks legit, I could see MDT level output especially if the HRRR is right. If we don't get any junk convection over IL tonight, our atmosphere is going to be jet fuel tomorrow, even with it the 00z HRRR is gas.

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17 minutes ago, Stebo said:

Tomorrow looks legit, I could see MDT level output especially if the HRRR is right. If we don't get any junk convection over IL tonight, our atmosphere is going to be jet fuel tomorrow, even with it the 00z HRRR is gas.

It’s definitely pure jet fuel that’s for sure. I’ll be back home tomorrow so hope for a good storm at least even tho the area has taken a beating as of late. 00Z is Hawt:sizzle:

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47 minutes ago, Stebo said:

Tomorrow looks legit, I could see MDT level output especially if the HRRR is right. If we don't get any junk convection over IL tonight, our atmosphere is going to be jet fuel tomorrow, even with it the 00z HRRR is gas.

Wow, just checked 00z and yeah, would be a higher end event for most of the sub. Southeast Wisconsin just absolutely mutilated. Check out some of the UD Helicity Swaths maxing out the scale over Grafton and West Bend. Impressive.

HRRR probably a pretty realistic outcome with the instability in place and the 50kt LLJ punching from the west around dark. Going to be a busy night.

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Just now, Harry Perry said:

Wow, just checked 00z and yeah, would be a higher end event for most of the sub. Southeast Wisconsin just absolutely mutilated. Check out some of the UD Helicity Swaths maxing out the scale over Grafton and West Bend. Impressive.

HRRR probably a pretty realistic outcome with the instability in place and the 50kt LLJ punching from the west around dark. Going to be a busy night.

The NAMs are pretty good as well, NAM12 has nearly 5000 J/kg SBCAPE before storms form around 00z.

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28 minutes ago, Harry Perry said:

Wow, just checked 00z and yeah, would be a higher end event for most of the sub. Southeast Wisconsin just absolutely mutilated. Check out some of the UD Helicity Swaths maxing out the scale over Grafton and West Bend. Impressive.

HRRR probably a pretty realistic outcome with the instability in place and the 50kt LLJ punching from the west around dark. Going to be a busy night.

Batten down the palms.

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