Alert archive / Texas / Mesoscale Discussions in 2023
Mesoscale Discussion 2139
The Storm Prediction Center issued this mesoscale discussion at Sep 11, 2023, 11:29 PM CDT for 20 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 11, 2023, 11:29 PM CDT (04:29 UTC)
- Expired
- Sep 12, 2023, 1:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 683
Counties Concho County, TX, Crockett County, TX, Gillespie County, TX, Glasscock County, TX, Irion County, TX, Kerr County, TX, Kimble County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Pecos County, TX, Reagan County, TX, San Saba County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Tom Green County, TX, Upton County, TX
The radar
The San Angelo radar (KSJT), 29 km from the middle of the area, began a volume at 04:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Midland Regional, TX (KMAF), launched 00:00Z, 4.5 hours before the alert went out and 195 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 749 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 2662 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.5
The text
As transmitted.
803
ACUS11 KWNS 120429
SWOMCD
SPC MCD 120429
TXZ000-120630-
Mesoscale Discussion 2139
NWS Storm Prediction Center Norman OK
1129 PM CDT Mon Sep 11 2023
Areas affected...southwest into central Texas
Concerning...Severe Thunderstorm Watch 683...
Valid 120429Z - 120630Z
The severe weather threat for Severe Thunderstorm Watch 683
continues.
SUMMARY...Strong to severe wind gusts remain possible with outflow
moving out of the Permian Basin toward parts of central Texas.
DISCUSSION...Multiple severe wind gusts have been measured over the
past two hours as storms developed southeastward out of NM. The
primary outflow surge remains intact and has moved through the MAF
area, and currently extends southwestward toward FST. A separate,
southward-moving outflow regime exists ahead of the western surge,
with robust storms from SJT eastward toward BWD. In between the two
outflows, around 1000 J/kg MLCAPE exists per objective analysis,
with minimal CIN. Given the strong lift with the surging and
possibly intersecting outflow later tonight, much of the area within
WW 683 will experience wind gusts over 40 kt, with a few severe
gusts expected.
..Jewell.. 09/12/2023
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FWD...EWX...SJT...MAF...
LAT...LON 30570326 31050239 31610189 32050146 32160111 31810067
31649984 31659906 31729871 31409844 30979843 30649855
30129871 29879910 30250116 30570326SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 7:36 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Brown, Callahan, Coke, Coleman and 25 more | 114 min |
| Sep 11, 8:58 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Brown, Callahan, Coke, Coleman, Concho and 29 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 2023Every mesoscale discussion in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.