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Severe March 13-15 Central Upper South Severe Threat

Webberweather53

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Once again, this is yet another window that has looked consistently conducive across virtually all the models for the past few days to produce some severe weather across the southern plains &/or Mississippi Valley as a large trough digs into the southwestern US then lifts as it emerges east of the Rockies, coming only 3-4 days on the heels of the preceding system that will also probably produce at least some severe weather.

Seems probable if not likely that the SPC will throw down another 15% risk area within the next day or two somewhere in the south-central plains once large-scale timing and evolution is more agreed upon within the models but it's pretty clear the SPC is already keeping an eye on it.

"a strengthening trough farther west is progged to be digging southward along the West Coast, before shifting more eastward/inland Day 6. At this point, model agreement deteriorates significantly with eastward progression/evolution of this system, and thus forecast confidence remains low during the second half of the period."


This afternoon's 12z ECMWF is by far & away one of the more ominous looking runs at 500mb by day 7, w/ a strong, negatively tilted s/w trough lifting north thru west Texas and Oklahoma.

ecmwf_z500a_us_8 (2).png


GFS generally follows suit just about 6-12 hours earlier than the ECMWF which is part of the reason why we haven't seen a risk area outlined by the SPC yet although there's almost certainly a legitimate severe threat in this period.

gfs_z500a_us_27.png
 
Once again, this is yet another window that has looked consistently conducive across virtually all the models for the past few days to produce some severe weather across the southern plains &/or Mississippi Valley as a large trough digs into the southwestern US then lifts as it emerges east of the Rockies, coming only 3-4 days on the heels of the preceding system that will also probably produce at least some severe weather.

Seems probable if not likely that the SPC will throw down another 15% risk area within the next day or two somewhere in the south-central plains once large-scale timing and evolution is more agreed upon within the models but it's pretty clear the SPC is already keeping an eye on it.

"a strengthening trough farther west is progged to be digging southward along the West Coast, before shifting more eastward/inland Day 6. At this point, model agreement deteriorates significantly with eastward progression/evolution of this system, and thus forecast confidence remains low during the second half of the period."


This afternoon's 12z ECMWF is by far & away one of the more ominous looking runs at 500mb by day 7, w/ a strong, negatively tilted s/w trough lifting north thru west Texas and Oklahoma.

View attachment 17446


GFS generally follows suit just about 6-12 hours earlier than the ECMWF which is part of the reason why we haven't seen a risk area outlined by the SPC yet although there's almost certainly a legitimate severe threat in this period.

View attachment 17447

These constant threats are certainly worrying, really hope same areas that got hit with tornadoes already don’t get much severe wx or don’t get any
 
I guess Saturdays threat has faded for north Alabama will be watching next week now
 
Flood concerns for Nashville extending west into ETN. Those are some beastly 24hr rainfall totals. I’m sure the jackpot zone will change between now and then but yowzah
 
What days for the Tennessee valley and Mississippi valley is the threat the greatest ?? The 14th and 15th ??

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Doesn't look like much of a threat now ....
Really kind of hard to with any models in the day 7+ models, any of them!
 
Damn, I am going to be driving from Dallas to Memphis Thursday and then from Memphis to Amory Friday or Saturday. This will not be fun to drive in.
 
This thread went silent today with the ongoing storms. Where are we with next week's threat?
 
5ee4312236f61c54a1c2bc9cf47541ab.jpg


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Interesting soundings, this is from central Tennessee, this supports low topped supercells/hslc storms, very steep llvl lapses and very large 3CAPE, large helicity, ok curved hodo, sfc dews are a little dry but it’s enough, this one should be interesting 78F8E3C1-0C8E-4DCD-B1E1-A90368B32C87.png
 
Interesting soundings, this is from central Tennessee, this supports low topped supercells/hslc storms, very steep llvl lapses and very large 3CAPE, large helicity, ok curved hodo, sfc dews are a little dry but it’s enough, this one should be interesting View attachment 17618

Can someone point me in the direction of a resource to learn how to read this graphic? It looks like a TREMENDOUS amount of data and I would like to better understand it. I recognize some things, but not all.

Thank you.
 
Concerning sounding from northern TN/KY border, again this screams low topped convection, with large hail and some tornadoes, with low top convection you can have a little bit less of things due to a smaller updraft but we still got lots lots of wind energy anyways, note that very large 3CAPE, would allow for explosive initial updraft growth, along with steep low level lapse rates, and decently steep mid level lapses, based of LCL cloud bases would be decently low, one thing tho is that sfc dews are pretty low, typically tornadoes like 65+ dews but tornadoes can definitely still happen with dews lower than that, hodo is very large and decently curved, looks like there is a little vb in there, and maybe it has a bit of a look that says some linear convection
A780E7F2-82C3-4CF5-BD10-A34B9925952B.png6B687F58-470D-4A0F-9978-B96CE9FCFDD8.jpeg
 
How's the threat looking nws Huntsville not too concerned says dynamics not lining up
 
Probably a slight risk type day. Nothing crazy, but stay weather aware for sure.

I honestly think this day has more potential, this setup lacks junk or crapvection atm, low topped supercells can be as bad as there taller counterparts, in fact low topped supercells does not need as much instability or shear as a taller one would, with this sounding there is very steep low level lapse rates along with strong 3CAPE, decent mid level lapses and a decent dew point although like I said it’s a little low, strong veering winds, good amounts of helicity, dry air aloft along with DCAPE to aid in strong downdrafts, in my opinion this could be worse than last system, storms last system struggled with low sfc based cape/CIN and relying on more MUcape allowing them to be a little more elevated in nature, this is a sounding from southern Missouri, btw this was the 18z 79257F26-B9DE-46CC-B2F6-957AC4F0AC23.png
C2D6100F-F28D-4372-9DB7-8D138C440899.jpeg
 
When we roll into april... instability wont be a problem for these systems ... we should start tapping moisture from the Caribbean origin....

Agree, Also, new NAM took the threat south aswell, and yeah I feel like we’ll get that cool down mid-late March then unfortunately pick back up on severe wx
 

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Yea man the HRRR goes nuts with supercells in New Mexico. Think the SPC only has 2% tornado also lol
Look at that big hail growth zone !?, that supports huge hail, I wouldn’t wanna go chasing in that, those supercells will be mean tommorow even if they don’t produce much tornadoes
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