Alert archive / Texas / Mesoscale Discussions in 2020
Mesoscale Discussion 721
The Storm Prediction Center issued this mesoscale discussion at May 24, 2020, 11:23 PM CDT for 17 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 24, 2020, 11:23 PM CDT (04:23 UTC)
- Expired
- May 25, 2020, 1:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 224...225
Counties Aransas County, TX, Bee County, TX, Brooks County, TX, Calhoun County, TX, Cameron County, TX, Goliad County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Starr County, TX, Victoria County, TX, Willacy County, TX
The radar
The Corpus Christi radar (KCRP), 62 km from the middle of the area, began a volume at 04:24 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
Corpus Christi, TX (KCRP), launched 00:00Z, 4.4 hours before the alert went out and 65 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
- 2479 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 921 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
- 47 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
The text
As transmitted.
540
ACUS11 KWNS 250423
SWOMCD
SPC MCD 250423
TXZ000-250630-
Mesoscale Discussion 0721
NWS Storm Prediction Center Norman OK
1123 PM CDT Sun May 24 2020
Areas affected...South Texas and Texas Coastal Plains
Concerning...Severe Thunderstorm Watch 224...225...
Valid 250423Z - 250630Z
The severe weather threat for Severe Thunderstorm Watch 224, 225
continues.
SUMMARY...A wind damage and isolated large hail is expected to
continue into the overnight period across south Texas and the middle
Texas Coastal Plain.
DISCUSSION...Latest radar imagery shows a well-developed linear MCS
from near the Rio Grande extending northward into eastern sections
of the Texas Hill Country. The large-scale bow and associated cold
pool is moving into a strongly unstable airmass with the RAP
estimating MLCAPE along the lower to middle Texas Coast in the 2500
to 3000 J/kg range. The line is being forced by an upper-level
trough and associated mid-level speed max moving through southwest
Texas. The line will continue eastward the Texas Coast and should
affect far south Texas where the instability and moderate deep-layer
shear should keep a wind damage threat going. An isolated tornado
and large hail threat will also be possible within rotating cells
embedded in the line.
..Broyles.. 05/25/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...HGX...CRP...EWX...BRO...
LAT...LON 26099755 26119713 26279695 26819702 27369697 27999659
28319645 28689653 28959710 28859748 28409781 27909810
27469848 27149891 26939910 26769908 26519895 26449884
26169808 26099755SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 7:05 PM CDT | Severe Thunderstorm Watch | SPC | Blanco, Brown, Burnet, Callahan, Coleman, Comal and 19 more | 5 hr |
| May 24, 8:21 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bastrop, Bee, Bexar, Brooks and 26 more | 114 min |
| May 24, 8:43 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Foard, Hall, Hardeman and 1 more | 2 hr |
| May 24, 9:05 PM CDT | Severe Thunderstorm Watch | SPC | Aransas, Bastrop, Bee, Caldwell, Calhoun, DeWitt and 16 more | 7 hr |
| May 24, 10:41 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more | 4 hr |
| May 25, 1:50 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Red River | 85 min |
| May 25, 3:19 PM CDT | Mesoscale Discussion | SPC | Maverick | 116 min |
| May 25, 5:04 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Kenedy and 4 more | 116 min |
Nearby
Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020
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.