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Texas/Oklahoma 2023 Obs and Discussion


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Should be a different story up there around Eastern TX region tomorrow afternoon - Saturday.

CAMs also starting to show stuff reaching into Southern TX by Saturday now instead of Sunday.

ARWs holding on, and now 0Z HRRR run tonight latching onto those 2 defined mid-level impulses diving south through DFW - HOU regions with some decent sized convective clusters around Houston area later Friday afternoon and Dallas area from the second main impulse Friday night tomorrow.

FDD35391-7F2D-4641-A48C-D6A81012AE5A.thumb.jpeg.fbdfd65826b6424cbbcb9f7cd001ff40.jpeg
 

B847E459-A9E3-4DA6-8A8B-18EFE2D19C25.gif.3449a18c771b7a8ed83eb9b08111d68a.gif

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41 minutes ago, Powerball said:

 


A LOT of that can be thanks to the typical compressional heating effects of the cool front in DFW vicinity near the Red river (not really the heat dome High as 500 MB heights are < 595 on this morning's 12Z upper-air soundings so not lots of subsidence/warming aloft anymore). As there's a cluster of Thunder cells firing now in Wichita Falls area ahead of that 2nd incoming shortwave impulse in OK moving southeast in the established mid-upper level northerly flow aloft.

FB8FF425-1650-4890-BC75-72F08A9A180A.thumb.png.c2a2fe81fde9ae1448691f0748c5b388.png
 

5DFB722B-5ED7-43DB-BD7B-9107B93E2A06.jpeg.044d546655b2aee01872f59c719aa1f5.jpeg
 

https://www.spc.noaa.gov/obswx/maps/500_230908_12.gif

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SPC has MD out for the developing cluster in DFW region: https://www.spc.noaa.gov/products/md/md2116.html

It's also looking a lot better now with organization into an MCC for the most part now on TX centered radar/lightning data map:

52D8111B-19FA-4621-A71B-B62DE59CFA57.thumb.png.08260ad70e320a2a8bfe0cc11b73977e.png
 

Finally nice to see a convective event that's non-tropical and linearly organized like that going on in the state again especially after this summer..

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Quite the storms heading through Tarrant county atm

 

Severe Thunderstorm Warning
TXC251-439-090430-
/O.NEW.KFWD.SV.W.0496.230909T0353Z-230909T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Fort Worth TX
1053 PM CDT Fri Sep 8 2023

The National Weather Service in Fort Worth has issued a

* Severe Thunderstorm Warning for...
  Northeastern Johnson County in north central Texas...
  South central Tarrant County in north central Texas...

* Until 1130 PM CDT.

* At 1052 PM CDT, a severe thunderstorm was located over Crowley,
  moving southeast at 25 mph.

  THIS IS A DESTRUCTIVE STORM FOR AREAS FROM CROWLEY TO BURLESON IN
SOUTHERN TARRANT COUNTY AND NORTHERN JOHNSON COUNTY!

  HAZARD...80 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without
           shelter. Mobile homes will be heavily damaged. Expect
           considerable damage to roofs, windows, and vehicles.
           Extensive tree damage and power outages are likely.

* Locations impacted include...
  Fort Worth, Burleson, Crowley, Everman, Keene, Joshua, Alvarado,
  Rendon, Edgecliff Village, Cross Timber, Edgecliff, Briaroaks,
  Egan, and Lillian.

This includes Interstate 35W between mile markers 29 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection get inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3257 9745 3267 9734 3249 9715 3240 9730
TIME...MOT...LOC 0352Z 325DEG 21KT 3259 9735

THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH

$$
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FA06640E-15F4-4F3D-9923-BE387995CCFF.thumb.jpeg.49e58f8c2b69fb7115e0161a2f31c926.jpeg

- Saw this evening's 0Z Fort Worth upper-air SPC sounding a short while ago and it's very interesting to note how little CAPE & not much atmospheric moisture there is (especially for the time of year) being acted on by this apparently vigorous incoming mid-level shortwave up there in North TX as new clusters are starting to fire up east/southeast of DFW now.

Though the frequent cloud lightning I'm seeing on webcams in Dallas and Fort Worth right now, is being attributed to those steep mid-level lapse rates near 8 C.

89F6E76F-5077-4661-BBF0-23A36ADBA036.thumb.png.cdabb2c85ef0b2c0d8aa4b610b8445ca.png


----------
This evening's 0Z CAM runs seem to be doing a poor job handling this mesoscale convective event, but do show the current activity making a run down into Houston overnight.

Would not be surprised if it makes it given that it's a pretty vigorous incoming second shortwave the CAMs were showing yesterday. Tomorrow could be interesting further down into Southern TX region.

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Quick hitting 6 am t-shower (I was watching HGX radar, it popped up overhead while more storms were E) at 6 this morning rained on my house for 5 minutes w/ two rumbles.  106*F yesterday broke the record from the prior day which broke the record from the prior day of hottest temp/latest in the year.  Only 99* predicted today in Houston.

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361EDEF8-70D5-498A-A4F1-6B2C9612C60D.thumb.png.da17a49131a4ad45f7658ab5990c5404.png

New convective areas flaring up right now in the northern Hill Country, and just up the road from me here around the Coastal Bend/mid-TX coast (not too far southwest of Houston).

CAM runs from today still aren't showing much going on in the state through tonight and mainly over the western hill country and TX Panhandle later tomorrow. ARWv2 has been showing some cells trying to move into my area down the coast this evening since yesterday evening run.

I suspect the action developing between San Angelo and Dallas right now is being caused by another potent mid-level shortwave. So it has potential to organize into an MCS. If it does, it might reach all the way south to the coastal bend/South TX overnight.

San Antonio, of course, has much better probability of getting hit later this evening.


 

5 hours ago, Ed, snow and hurricane fan said:

Quick hitting 6 am t-shower (I was watching HGX radar, it popped up overhead while more storms were E) at 6 this morning rained on my house for 5 minutes w/ two rumbles.  106*F yesterday broke the record from the prior day which broke the record from the prior day of hottest temp/latest in the year.  Only 99* predicted today in Houston.

 

It was a good amount of thunder cells literally on east side of the metro as I saw on the ABC 13 streaming tower cams around 5:30 this morning. Lightning was pretty bright and fairly frequent almost overhead watching the cam looking east toward downtown. Heard a few good thunder rumbles on the railroad cams on YTube also like on Sampson St.

CC9C58CD-E632-4E24-9C97-C80E19EE1112.thumb.png.2544da7c9dcb50f226845ec38ce433a8.png

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20232550001-20232550356-GOES16-GLM-SP-EX

https://www.spc.noaa.gov/products/md/md2139.html
 

10 hours ago, Ed, snow and hurricane fan said:

Only 96* in Houston and afternoon dew points dropped to 59*.  And it should rain.

p120i.gif


I noticed a slightly more comfortable feeling outside tonight down here and saw DPs are in the 60s despite persistent onshore flow (no front).

Global models not forecasting statewide (large) convective MCS events until about the end of the week when better support aloft for lift with the southern stream flow dives further south into TX pushing the cool front all the way through the state on the weekend. All the convective outflow processes would help push it south faster.

More significant MCS events could start happening a little earlier by Thursday. Maybe Wednesday, as I'm starting to see that in some of the CAMs tonight even into South TX. But at least forecast precip probabilities have been staying pretty high almost everywhere for TX by weekend.

E75C851E-86D0-4585-8611-C9B4E8984E59.jpeg.612d4b0c1894487e784e04964afec8f1.jpeg

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Both globals and CAMs have been showing generally 30 - 35 Kts of Bulk Shear over most of the state during these next couple of days. Which would support at least some stronger updraft intensity and organization. So stronger clusters and a few supercells can't be ruled out.

More statewide convective onset (including southern half) looks to start tomorrow (Wednesday) as most of the latest CAM runs tonight are now depicting.

652A7CCC-9214-4CED-83E0-A7C6F08F1BBE.gif.8c42f5c1191ac9e8a1b7de16980290ab.gif
 

DB5F7AEE-22E8-408D-B991-A02E4CB3866C.jpeg.b8a920618b66ff63eac398053ace5eee.jpeg

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Been skunked two days in a row.  Yesterday I saw the lightning and the dark rain curtain, but nothing.  The line then filled in completely once past.  Trying to will storms to the WNW to move E and not SE.  1.7" PW IMBY as compared to the 2" PW to the W suggests another dry day is possible.

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https://www.spc.noaa.gov/products/md/md2163.html

   Mesoscale Discussion 2163
   NWS Storm Prediction Center Norman OK
   0520 PM CDT Tue Sep 19 2023

   Areas affected...north-central Texas.

   Concerning...Severe Thunderstorm Watch 686...

   Valid 192220Z - 192345Z

   The severe weather threat for Severe Thunderstorm Watch 686
   continues.

   SUMMARY...A supercell across north-central Texas could pose a large
   hail threat this evening.

   DISCUSSION...A supercell formed on the western periphery of mid-day
   elevated convection which moved east across north-central Texas.
   Given only weak CINH near this storm and its radar depiction over
   the last hour, this storm has likely rooted and is surface based in
   a region with around 1000 J/kg MLCAPE. 40+ knots of mid-level
   northwesterly flow (per FWD VWP) has yielded near 50 knots of
   effective shear. This environment will support supercells capable of
   large hail (potentially 2+ inches). If this storm continues to turn
   right, which it has started to do over the last 15 to 30 minutes,
   portions of at least the northern DFW metro area may be impacted by
   large to very large hail this evening. 

   If this storm continues to maintain its current intensity or
   strengthen, an expansion of watch 686 may be needed.

   ..Bentley/Bunting.. 09/19/2023
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Severe Weather Statement
National Weather Service Fort Worth TX
539 PM CDT Tue Sep 19 2023

TXC121-192300-
/O.CON.KFWD.SV.W.0511.000000T0000Z-230919T2300Z/
Denton TX-
539 PM CDT Tue Sep 19 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHWESTERN DENTON COUNTY...

At 539 PM CDT, a severe thunderstorm was located near Krum, or 9
miles west of Denton, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
Denton, Corinth, Sanger, Krum, Shady Shores, Ponder, Stony, and
Bolivar.

LAT...LON 3337 9711 3315 9704 3320 9739 3337 9738
TIME...MOT...LOC 2239Z 325DEG 18KT 3323 9729

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dunn
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Severe Weather StatementNational Weather Service Fort Worth TX539 PM CDT Tue Sep 19 2023TXC121-192300-/O.CON.KFWD.SV.W.0511.000000T0000Z-230919T2300Z/Denton TX-539 PM CDT Tue Sep 19 2023...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDTFOR NORTHWESTERN DENTON COUNTY...At 539 PM CDT, a severe thunderstorm was located near Krum, or 9miles west of Denton, moving southeast at 20 mph.HAZARD...60 mph wind gusts and quarter size hail.SOURCE...Radar indicated.IMPACT...Hail damage to vehicles is expected. Expect wind damage to        roofs, siding, and trees.Locations impacted include...Denton, Corinth, Sanger, Krum, Shady Shores, Ponder, Stony, andBolivar.LAT...LON 3337 9711 3315 9704 3320 9739 3337 9738TIME...MOT...LOC 2239Z 325DEG 18KT 3323 9729HAIL THREAT...RADAR INDICATEDMAX HAIL SIZE...1.00 INWIND THREAT...RADAR INDICATEDMAX WIND GUST...60 MPH$$Dunn


That cell west of OKC is wild. Moving in a completely different direction
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