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June 5th-September 1st, 2023 | Severe Storm Sequence


Iceresistance

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Clouds taking their sweet time getting out of the way here in Ohio. Just now really starting to get some decent clearing here in Findlay. Suppose there’s still plenty of time to get some fuel before things chug this way. Will be an interesting afternoon/evening watching this develop. 

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 Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1130 AM CDT Sun Jun 25 2023

   Valid 251630Z - 261200Z

   ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS PARTS OF THE
   MIDWEST/CENTRAL OH VALLEY TO THE MID/DEEP SOUTH...

   ...SUMMARY...
   Scattered to numerous severe storms are expected through tonight
   across a broad portion of the Midwest/Ohio Valley into the Mid and
   Deep South. The greatest threat for tornadoes, at least a couple of
   which could be strong, appears to be in the eastern Indiana, western
   Ohio, and northern Kentucky vicinity during the late afternoon to
   early evening.

   ...Central Great Lakes/OH Valley to the Mid/Deep South...
   Shortwave trough over the Upper MS Valley will shift east into Lower
   MI tonight. Attendant surface cyclone will similarly track east from
   west-central WI into west-central Lower MI. Arcing cold front will
   have greater eastward advancement across parts of the Midwest, with
   trailing portion drifting south-southeast across the Mid-South. A
   broad swath of severe potential remains evident ahead of this front,
   likely yielding scattered areas of severe storms and embedded
   mesoscale corridors of more numerous reports.

   Ongoing convection persists across southeast KY into middle/eastern
   TN and will probably continue along the gradually eastward-shifting,
   north/south-oriented MLCAPE gradient. An isolated damaging wind
   threat should exist downstream across the southern Appalachians. A
   scattered wind/hail threat may emerge within multicell clusters that
   can regenerate westward later this afternoon over the TN Valley and
   persist into this evening.

   Potential for more numerous severe events appears to be focused
   within two bimodal corridors along/ahead of the front. The first is
   in the vicinity of eastern IN/western OH/northern KY border.
   Scattered thunderstorms will increase during the next few hours in
   the Lake MI vicinity arcing south across IN and then southwest
   across the Lower OH Valley. In the wake of the morning convection in
   KY, trailing outflow appears to have finally stalled across western
   KY and far southwest IN. How far to the northeast recovery can occur
   in its wake is uncertain, but it is plausible that it may be able to
   reach the IN/OH/KY border area by late afternoon/early evening. With
   a plume of mid 70s surface dew points to the west of this outflow,
   large buoyancy with MLCAPE of 3000-3500 J/kg will become common.
   Despite gradual weakening of the strong mid-level jetlet attendant
   to the shortwave trough, the leading edge of 50+ kt 500-mb
   westerlies should overlay the Lower OH Valley portion of the front.
   This setup will likely yield the best CAPE/shear/SRH parameter space
   near the IN/OH/KY border area where a few intense supercells are
   expected, capable of producing strong tornadoes and destructive
   hail/wind. Quicker upscale growth into clusters/QLCS is expected
   with northern extent where deep-layer wind profiles will be less
   favorable for maintaining discrete supercell structures. This
   activity should eventually outpace/become pinched off from the large
   buoyancy plume emanating from the Lower OH Valley.

   A second area of potentially destructive hail and wind should
   emanate along the AR portion of the front. The 12Z LZK sounding had
   a very favorable thermodynamic profile with a mean-mixing ratio of
   18 g/kg and mid-level lapse rates of 8-8.5 C/km. With 74-77 F
   surface dew points common to the south of the front, very large
   buoyancy of 3500-4000 J/kg will be prevalent by late afternoon.
   Scattered thunderstorms will develop across northern AR and quickly
   become supercells within the gradient of mid/upper
   west-northwesterly flow. This type of orientation semi-parallel to
   the front should support upscale growth during the evening. Most
   morning CAMs are consistent in suggesting an MCS will evolve
   southeast across the Lower MS Valley with an enhanced threat for
   damaging winds.

   ..Grams/Squitieri.. 06/25/2023

 

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 URGENT - IMMEDIATE BROADCAST REQUESTED
   Tornado Watch Number 374
   NWS Storm Prediction Center Norman OK
   1235 PM CDT Sun Jun 25 2023

   The NWS Storm Prediction Center has issued a

   * Tornado Watch for portions of 
     Indiana
     Far southern Lower Michigan
     Northwest Ohio
     Lake Michigan

   * Effective this Sunday afternoon and evening from 1235 PM until
     700 PM CDT.

   * Primary threats include...
     A few tornadoes likely with a couple intense tornadoes possible
     Scattered large hail and isolated very large hail events to 3
       inches in diameter likely
     Scattered damaging winds and isolated significant gusts to 75
       mph possible

   SUMMARY...Initial supercells will develop near the Indiana-Michigan
   border area and arc south through the body of Indiana this
   afternoon. Wind-driven, very large hail is likely with the tornado
   threat increasing towards eastern Indiana and northwest Ohio.

   The tornado watch area is approximately along and 60 statute miles
   east and west of a line from 35 miles southeast of Bloomington IN to
   40 miles northeast of South Bend IN. For a complete depiction of the
   watch see the associated watch outline update (WOUS64 KWNS WOU4).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Tornado Watch means conditions are favorable for
   tornadoes and severe thunderstorms in and close to the watch
   area. Persons in these areas should be on the lookout for
   threatening weather conditions and listen for later statements
   and possible warnings.

   &&

   AVIATION...Tornadoes and a few severe thunderstorms with hail
   surface and aloft to 3 inches. Extreme turbulence and surface wind
   gusts to 65 knots. A few cumulonimbi with maximum tops to 550. Mean
   storm motion vector 25040.

   ...Grams

 

ww0374_radar.gif

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36 minutes ago, BuckeyeGal said:

The storms all broke apart as they moved through Ohio on the 12z 3k NAM. Looked super strange.

Interesting. Did it show them breaking apart and fizzling? Or breaking apart yet maintaining? 
 

Not saying this is (nor is anybody wanting to see anything even close to) the same situation, but the Memorial Day 2019 (Dayton) outbreak was in main part due to storms breaking apart/staying somewhat discreet instead of congealing as forecasted. 
 

Regardless, keep an eye open and stay safe!

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5 minutes ago, NWsnowhio said:

Interesting. Did it show them breaking apart and fizzling? Or breaking apart yet maintaining? 
 

Not saying this is (nor is anybody wanting to see anything even close to) the same situation, but the Memorial Day 2019 (Dayton) outbreak was in main part due to storms breaking apart/staying somewhat discreet instead of congealing as forecasted. 
 

Regardless, keep an eye open and stay safe!

Not sure what happened!

IMG_4309.gif.6288b00e62a92df350c1d981fac97d5d.gif

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  URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 375
   NWS Storm Prediction Center Norman OK
   155 PM EDT Sun Jun 25 2023

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Western to central Lower Michigan
     Lake Michigan

   * Effective this Sunday afternoon and evening from 155 PM until
     700 PM EDT.

   * Primary threats include...
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible
     Scattered damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Clusters with embedded supercells, especially across
   southwest Lower Michigan, will spread east-northeast through the
   afternoon.

   The severe thunderstorm watch area is approximately along and 45
   statute miles east and west of a line from 40 miles northwest of
   Houghton Lake MI to 15 miles southeast of Kalamazoo MI. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU5).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Severe Thunderstorm Watch means conditions are
   favorable for severe thunderstorms in and close to the watch area.
   Persons in these areas should be on the lookout for threatening
   weather conditions and listen for later statements and possible
   warnings. Severe thunderstorms can and occasionally do produce
   tornadoes.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 374...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
   few cumulonimbi with maximum tops to 450. Mean storm motion vector
   24040.

   ...Grams

 

ww0375_radar.gif

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4 minutes ago, BuckeyeGal said:

Not sure what happened!

IMG_4309.gif.6288b00e62a92df350c1d981fac97d5d.gif

I wouldn't put too much faith in that model.  IMO it's not always very accurate with convection.  The HRRR is consistently showing a line blowing up in east IN and moving southeast through OH.  Although more discrete cells look to dive towards southwest OH.

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15 minutes ago, Sam said:

I wouldn't put too much faith in that model.  IMO it's not always very accurate with convection.  The HRRR is consistently showing a line blowing up in east IN and moving southeast through OH.  Although more discrete cells look to dive towards southwest OH.

I figured it was having trouble with convection. It just looked really odd.

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