Severe Weather Threat May 17-19, 2025

[Shakespeare 2016]

Embedded violent tornadoes are a rare occurrence, and usually need extreme kinematics to occur, or a mesoscale interaction.
Or both.

The supercell to its south is reinforcing the RFD enough to where the inflow notch of the tornado producing supercell is actually forced up against the RFD push. Which is what induced the tornado genesis.
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What causes violent tornadoes to be embedded in lines and squall lines?

 

[Shakespeare 2016]

I can't think of a single tornado embedded in a line that was given a violent rating ever, although I'm sure there has been. What notable examples exist of an QLCS violent tornado?

I think there was one that occured in 1981.

 

[tornado examiner]

I can't think of a single tornado embedded in a line that was given a violent rating ever, although I'm sure there has been. What notable examples exist of an QLCS violent tornado?

The canton Texas EF4 2017, and greenfield 2024. Harrisburg Illinois from 2012
All embedded violent tornadoes.

 

[Shakespeare 2016]

The canton Texas EF4 2017, and greenfield 2024. Henryville Indiana from 2012
All embedded violent tornadoes.

Were they!

 

[Tanner]

I can't think of a single tornado embedded in a line that was given a violent rating ever, although I'm sure there has been. What notable examples exist of an QLCS violent tornado?

Harrisburg Illinois in February of 2012 was part of a quasi-linear supercell complex.

 

[Tennie]

I think there was one that occured in 1981.

IIRC, there was an anticyclonic QLCS tornado that got rated F4. It might even be the same one you're probably referring to--I may have to check back on that after this event is over.

 

[jiharris0220]

I can't think of a single tornado embedded in a line that was given a violent rating ever, although I'm sure there has been. What notable examples exist of an QLCS violent tornado?

It doesn’t specifically have to be in a QLCS, any coagulation of storms, if there’s a tornado inside the mess, then it’s an embedded tornado.

Greenfield, Joplin, Cookville, just to name the popular ones were all embedded tornadoes.

 

[Shakespeare 2016]

https://en.wikipedia.org/wiki/1981_West_Bend_tornado#:~:text=In the early morning hours,of a typical severe storm.

 

[jiharris0220]

What causes violent tornadoes to be embedded in lines and squall lines?

The current example I posted above, where a supercell merges with another one to its north/east which can cause a very storm RFD surge and create a convergence signature which can lead to a strong tornado.

 

[Shakespeare 2016]

IIRC, there was an anticyclonic QLCS tornado that got rated F4. It might even be the same one you're probably referring to--I may have to check back on that after this event is over.

You beat me to it.

 

[Grand Poo Bah]

Tornado or no Hartshorne still has 100 mph+ sustained winds moving in which will very much not be a good time.

 

[Tennie]

https://en.wikipedia.org/wiki/1981_West_Bend_tornado#:~:text=In the early morning hours,of a typical severe storm.

That's the one I was thinking of in my previous post:

IIRC, there was an anticyclonic QLCS tornado that got rated F4. It might even be the same one you're probably referring to--I may have to check back on that after this event is over.

 

[Kds86z]

 

[Ebaad Jaffery]

How’s the dry line look now?

 

[AJS]

They really aren’t giving up on this threat.

 

[slenker]

I was about to disagree with the 155-170 MPH call until I saw those hodographs. Wow.

 

[jiharris0220]

They really aren’t giving up on this threat.

I mean, what happened a couple of minutes ago is a good reason.

 

[AJS]

I mean, what happened a couple of minutes ago is a good reason.

Good point. That was pretty crazy. Been a while since i’d seen an embedded signature that intense.

 

[tornado examiner]

Another tornado possibly otg with that storm.

 

[WhirlingWx]