Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 833
The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2021, 2:50 AM CDT for La Salle County, McMullen County, Webb County, Texas. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2021, 2:50 AM CDT (07:50 UTC)
- Expired
- Jun 1, 2021, 4:15 AM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 232
Counties La Salle County, TX, McMullen County, TX, Webb County, TX
The radar
The Corpus Christi radar (KCRP), 172 km from the middle of the area, began a volume at 07:49 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, 7.8 hours before the alert went out and 189 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
- 721 J/kg
- Mixed-layer CIN
- -121 J/kg
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted.
830
ACUS11 KWNS 010751
SWOMCD
SPC MCD 010750
TXZ000-010915-
Mesoscale Discussion 0833
NWS Storm Prediction Center Norman OK
0250 AM CDT Tue Jun 01 2021
Areas affected...Portions of south TX
Concerning...Severe Thunderstorm Watch 232...
Valid 010750Z - 010915Z
The severe weather threat for Severe Thunderstorm Watch 232
continues.
SUMMARY...Isolated strong/gusty winds remain possible with a small
cluster of storms.
DISCUSSION...Strong velocities at low to mid levels have been noted
from KDFX over the past 1-2 hours with a small cluster of convection
moving slowly east-southeastward across south TX. Even though no
severe wind or damage reports have been received as of 0750Z
(Cotulla TX/KCOT recently measured a wind gust to 37 kt), isolated
strong/gusty winds will remain possible in the short term. Stronger
MLCIN likely exists to the south of this activity per recent
mesoanalysis estimates, and recent tracking of the cluster suggests
a more east-southeastward motion. The environment downstream remains
at least somewhat conducive for surface-based storms, with around
1000 J/kg of MLCAPE, 35-40 kt of deep-layer shear, and a moist
low-level airmass present. But, the lack of even more boundary-layer
instability may continue tend to limit the threat for severe wind
gusts to some extent across Severe Thunderstorm Watch 232.
..Gleason.. 06/01/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CRP...
LAT...LON 28049967 28189932 28599919 28619834 28039831 27409881
27349949 27689977 27779990 28049967SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 7:17 PM CDT | Severe Thunderstorm Watch | SPC | Dimmit, Edwards, Kinney, Maverick, Real, Uvalde and 2 more | 8 hr |
| May 31, 10:07 PM CDT | Mesoscale Discussion | SPC | Dimmit, Maverick, Zavala | 83 min |
| Jun 1, 12:09 AM CDT | Severe Thunderstorm Watch | SPC | Brooks, Duval, Jim Hogg, Jim Wells, La Salle, McMullen and 2 more | 6 hr |
| Jun 1, 12:44 AM CDT | Mesoscale Discussion | SPC | Dimmit, La Salle, Maverick, Zavala | 91 min |
| Jun 1, 2:14 PM CDT | Mesoscale Discussion | SPC | Dallam, Hartley | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2021Every mesoscale discussion in 2021
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.