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Tn Valley Severe Weather


jaxjagman
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Just now, jaxjagman said:

meh,oretty boring,seems like the cap was strong enough here

Well that line developing coming out of KY that is likely to hit Nashville East means business.  Going to be some wind damage from that line almost certain. Multiple broad rotation signatures along it now showing up. 

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4 minutes ago, Matthew70 said:

Well that line developing coming out of KY that is likely to hit Nashville East means business.  Going to be some wind damage from that line almost certain. Multiple broad rotation signatures along it now showing up. 

More east of Nashville it seems like

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Regrettably I could not get on here over the weekend. Looks like the Memphis area got slammed on Sunday. Chattanooga had a good line of storms, but no major wind. 

Yes those MCSs are notoriously hard to predict. High-res CAMs were garbage until the night before. That's actually not bad for summer MCSs. Models just can't get a handle 36-48 hours out like synoptic winter/spring. 00Z so about 18 hours ahead, models got the East Tennessee MCS blowing on outflow out of Kentucky.

Models did a little better with West Tennessee a full day and a half ahead because the focal point was a little closer to the synoptic system. In contrast East Tennessee was mesoscale driven by that outflow from previous convection. Fun forecasting.

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Trying to think what was worse from that MCS,the MCS or the winds that came from the OFB,that was some impressive winds when the OFB strolled through about a half hr ago,just about hit my BMW,should have taken a pic but my son dragged the huge brach into the woods in my back yard :(

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Sorry about the typo above,i  never seen something like this before,..lol.Pretty sure  now when the MCS came by the tree got struck by lightning and when the OFB came trough the winds were even more impressive from the OFB than the the MCS and took it down,Pretty cool still :)

 

 

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41 minutes ago, Jesse from KY said:

Question: What is the likelihood, based on what you've seen in the models and trends, of an upgrade for SE KY? For Friday and Saturday.

Looks nothing but wind and maybe hail,the lower levels look meh.Typical summer time storms ,be a long shot to get a upgrade..IMO

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We had another round of storms last evening.Had my lawn people clean up my yard yesterday and now it dont even look like they touched it this morning again.Had some stronger winds last night.Short range models have been nothing but bad the last few days,so who knows about today.

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Short range models are whiffing again

 URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 427
   NWS Storm Prediction Center Norman OK
   1205 PM CDT Sat Jul 1 2023

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northern Arkansas
     Southern Illinois
     Far southwest Indiana
     Western Kentucky
     Southeast Missouri
     Western Tennessee

   * Effective this Saturday afternoon and evening from 1205 PM
     until 900 PM CDT.

   * Primary threats include...
     Scattered damaging winds likely with isolated significant gusts
       to 80 mph possible
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible
     A tornado or two possible

   SUMMARY...Several areas of storm clusters are expected to persist
   and regenerate this afternoon. A couple of these should develop
   bowing structures capable of producing damaging winds and a brief
   tornado or two.

   The severe thunderstorm watch area is approximately along and 125
   statute miles east and west of a line from 10 miles west northwest
   of Salem IL to 5 miles south of Jonesboro AR. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU7).
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 URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 428
   NWS Storm Prediction Center Norman OK
   1225 PM CDT Sat Jul 1 2023

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northern Alabama
     Northwest Georgia
     Far southwest North Carolina
     Middle to southeast Tennessee

   * Effective this Saturday afternoon and evening from 1225 PM
     until 800 PM CDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph possible
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...Slow-moving multicell clusters should spread
   east-southeast this afternoon with a primary threat of scattered
   damaging winds.
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Day 2 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1228 PM CDT Sat Jul 01 2023

   Valid 021200Z - 031200Z

   ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS SUNDAY INTO SUNDAY
   NIGHT ACROSS MUCH OF TENNESSEE...KENTUCKY...WEST
   VIRGINIA...VIRGINIA...MARYLAND AND DELAWARE...PARTS OF SOUTHERN
   OHIO... PENNSYLVANIA AND NEW JERSEY...WESTERN NORTH
   CAROLINA...NORTHERN GEORGIA...ALABAMA AND MISSISSIPPI...AND EASTERN
   ARKANSAS...

   ...SUMMARY...
   Scattered strong thunderstorms, and a couple of evolving clusters of
   storms, will pose a risk for severe wind and hail in a corridor from
   the Mid South and lower Ohio and Tennessee Valley east-northeastward
   into the Mid Atlantic region Sunday through Sunday night

   ...Synopsis...
   Models indicate that split flow across the eastern Pacific into
   western North America may become more amplified into and through
   this period.  Within this regime, significant cyclogenesis is
   forecast to proceed later today through Sunday across the Canadian
   Prairies, with a trailing cold front advancing southeast of the
   international border, across much of the Northwest and northern
   Rockies into the northern Great Plains by 12Z Monday.

   While mid-level ridging builds downstream of the cyclone, across
   northwestern Ontario, southern Hudson and James Bays into adjacent
   portions of Quebec, positively tilted mid-level troughing in a
   branch to the south is forecast to shift slowly east-northeastward
   across the lower Great Lakes and Ohio Valley.  It appears that this
   will be accompanied by a broad weak surface low, migrating along a
   diffuse surface frontal zone (initially extending from the northern
   Mid Atlantic and Ohio Valley into the southern Great Plains), and
   developing surface troughing to the lee of the Blue Ridge.

   ...Mid Atlantic/Ohio and Tennessee Valleys into Ark-La-Tex...
   Along and just south of the weak frontal zone, the boundary-layer
   may be initially impacted by a considerable amount of remnant
   convective outflow.  How the associated outflow boundaries evolve
   through midday Sunday remains unclear, but insolation along and to
   their south likely will contribute to steepening low-level lapse and
   moderate to large CAPE in the presence of seasonably high moisture
   content.  This appears likely to occur beneath a belt of 30-40+ kt
   (perhaps stronger where augmented by prior convection)
   west-southwesterly flow in the 850-500 mb layer, which may prove
   conducive to renewed strong and organizing convective development
   Sunday afternoon and evening.  Isolated supercell structures are
   possible initially, posing a risk for severe hail, before
   potentially damaging wind gusts with evolving clusters becomes the
   more prominent hazard.
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We got rocked up on the Plateau(hwy111), had a cell pop up right over us in front of the main line. I'm not sure if we were hit with a microburst or what but it was the worst wind and hail I have experienced since the 2011 outbreak (lived in South knox then). So many old growth trees came down in the area, this event will leave a scar

 

https://streamable.com/3ap17d

 

 

 

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We have the answers. @Jesse from KY Enhanced both Saturday and Sunday. SPC was likely waiting for boundary placement before forecasting corridors of more straight line wind. This is my first time on the board in a while. Work was a whip last week.

I was kind of expecting a small 5% Tor Sunday since they did Saturday. Sunday has greater flow aloft, though Saturday did have the more obvious outflow boundary. 

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  • 2 weeks later...
  • 3 weeks later...

Potential severe in the eastern Valley tomorrow. Slight tornado potential prior to MCS formation.
https://www.spc.noaa.gov/products/outlook/day2otlk.html

Excerpt:

...TN Valley to the Carolinas/Southeast vicinity...
Thunderstorm clusters are expected to develop from Middle/eastern TN into northern AL/GA by early afternoon. Strong instability with MLCAPE values generally from 2000-4000 J/kg and effective shear magnitudes greater than 40 kt will support vigorous updrafts. Further south from the surface low, deep-layer flow (above 1 km) will generally be unidirectional from the west. Some modest backed low-level flow is forecast, which could support a tornado or two, but convection is expected to grow upscale into a bowing MCS fairly quickly as storms spread east across eastern TN/northern GA and the Carolinas during the afternoon/evening. Convection should gradually weaken as it approaches the coastal Carolinas after dark. Some uncertainty exists with regards to severe potential with southward extent. Deep-layer flow weakens with southward extent, but if southward propagating cluster develops, some wind risk can be expected into southern AL/GA given degree of instability and a very moist airmass/water-loaded downdrafts.

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