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Tn Valley Severe Weather


jaxjagman
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URGENT - IMMEDIATE BROADCAST REQUESTED
   Tornado Watch Number 75
   NWS Storm Prediction Center Norman OK
   950 AM CDT Tue Apr 2 2024

   The NWS Storm Prediction Center has issued a

   * Tornado Watch for portions of 
     Southern Kentucky
     Western and middle Tennessee

   * Effective this Tuesday morning and afternoon from 950 AM until
     300 PM CDT.

   * Primary threats include...
     A few tornadoes likely with a couple intense tornadoes possible
     Widespread damaging winds and isolated significant gusts to 75
       mph likely
     Scattered large hail events to 1.5 inches in diameter likely

   SUMMARY...A loose cluster of storms in western Tennessee is expected
   to evolve into a couple of supercells while spreading
   east-northeastward toward southern Kentucky and middle Tennessee
   through midday and early afternoon.  The environment ahead of the
   storms will be favorable for tornadoes, a couple of which could be
   strong (roughly EF2), as well as damaging gusts up to 75 mph and
   large hail of 1-1.5 inches in diameter.

   The tornado watch area is approximately along and 50 statute miles
   north and south of a line from 20 miles north of Jackson TN to 45
   miles north of Crossville TN. For a complete depiction of the watch
   see the associated watch outline update (WOUS64 KWNS WOU5).
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3 minutes ago, Runman292 said:

Is it just me, or does it seem like this system is going to arrive in East TN faster than the 6 PM time frame that the local Mets are saying?

RAP and HRR shows more that will develop later on so we'll see

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Newest update from MRX:

Forecast is on track this morning with severe weather potential expected later this afternoon and evening. Surface obs show a region of low to mid 60s dewpoints stretching from northern AL, through Middle TN, and southeast TN. With additional surface heating through the afternoon, models continue to show MLCAPE around 1000 J/Kg being likely combined with low level shear of 30+kt and bulk shear of around 50 to 60 kt. Model guidance shows fairly large, curved hodographs bringing a potential of mixed mode supercells and QLCS storms through the evening.

Many of the CAMs this morning are having a difficult time resolving ongoing convection across the Tennessee and Ohio Valleys. In particular, the HRRR does not seem to be doing a great job with initialization at this time. With the available guidance, you can find a CAM to fit your priors of a very active severe weather event to a more quiet event. The main thing to focus on is that we will have sufficient instability and shear for severe weather - including damaging winds, large hail, and tornadoes - later this afternoon and evening. The severe weather risk remains unchanged with the potential for a fairly widespread severe event across portions of the Tennessee and Ohio Valleys late this afternoon through the early overnight hours.

 

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I’m wondering, concerned with the potential that the cluster complex in MTn lays down a boundary on its SE flank that could back low level winds more. I am worried about the plateau region into upper ETn including Knoxville. This area doesn’t look like it will see any crap showers and the sun continues to poke through at times.


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MRX has released their AFD early:

Discussion:

 

The main impact in the forecast period will the the probability for severe thunderstorms later this afternoon through the early overnight hours. Much of the CAM guidance this morning has struggled with ongoing convection with a wide variety of potential outcomes for storm mode and evolution through the overnight hours. However, models have consistently shown 500 to 1500 J/Kg of MLCAPE late this afternoon into the early overnight hours with strong effective bulk shear of 60 to 60 kt with effective low-level shear around 30 kt. Hodographs are showing the potential for some significant length and curvature at times which would create a favorable environment for supercell structures that could coalesce into a QLCS line later this evening with embedded rotation. Current satellite and observations show a wide area of upper divergence across northern Mississippi and West Tennessee that will continue to transition eastward with the upper jet through the evening. Stronger DPVA will result in height falls, moreso after 21z today which will continue to erode the mid-level CAP and increase instability. Current observations show dew points in the low to mid 60s across the Tennessee Valley with a general surge northward through the evening as southwesterly flow increases across the area. All of this points to severe thunderstorms continue to be expected across much of the Tennessee and Ohio Valleys with the potential for damaging winds, hail, and tornadoes.

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Says thats a confirmed tornado

Yep. Watching WBIR they are doing a good job showing radar, velocity and cor. coefficient as to how it’s depicted on radar. Talking debris balls and that it appears to be growing and tightening up.


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Tornado Warning
TNC013-151-022230-
/O.NEW.KMRX.TO.W.0002.240402T2144Z-240402T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Morristown TN
544 PM EDT Tue Apr 2 2024

The National Weather Service in Morristown has issued a

* Tornado Warning for...
  Campbell County in east Tennessee...
  Southeastern Scott County in east Tennessee...

* Until 630 PM EDT.

* At 543 PM EDT, a confirmed large and extremely dangerous tornado
  was located near Huntsville, or 11 miles southeast of Oneida,
  moving northeast at 35 mph.

  This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

  HAZARD...Damaging tornado.

  SOURCE...Public confirmed tornado.

  IMPACT...You are in a life-threatening situation. Flying debris
           may be deadly to those caught without shelter. Mobile
           homes will be destroyed. Considerable damage to homes,
           businesses, and vehicles is likely and complete
           destruction is possible.

* This tornadic thunderstorm will remain over mainly rural areas of
  Campbell and southeastern Scott Counties, including the following
  locations... Jellico, Elk Valley, Indian Mountain State Park,
  Fincastle, Royal Blue, White Oak, Norma, and Caryville.

This includes Interstate 75 in Tennessee between mile markers 138 and
161.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, TAKE COVER NOW! Move
to a basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

 

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