Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 832
The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2021, 12:44 AM CDT for 4 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2021, 12:44 AM CDT (05:44 UTC)
- Expired
- Jun 1, 2021, 2:15 AM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 231...232
Counties Dimmit County, TX, La Salle County, TX, Maverick County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 102 km from the middle of the area, began a volume at 05:43 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
Del Rio, TX (KDRT), launched 00:00Z, 5.7 hours before the alert went out and 143 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
- 2624 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 922 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 2.8
- Supercell composite
- 11.0
The text
As transmitted.
247
ACUS11 KWNS 010545
SWOMCD
SPC MCD 010544
TXZ000-010715-
Mesoscale Discussion 0832
NWS Storm Prediction Center Norman OK
1244 AM CDT Tue Jun 01 2021
Areas affected...Portions of south-central TX
Concerning...Severe Thunderstorm Watch 231...232...
Valid 010544Z - 010715Z
The severe weather threat for Severe Thunderstorm Watch 231, 232
continues.
SUMMARY...Isolated severe wind gusts remain the primary severe
threat in the short term, but occasional marginally severe hail may
also occur.
DISCUSSION...A small cluster of storms along the Rio Grande should
continue to move slowly southeastward across parts of south-central
TX early this morning. A moist and at least weakly unstable airmass
exists downstream of this convection, with surface temperatures
generally in the mid 70s to low 80s, and dewpoints in the low 70s.
Around 20-25 kt of south-southeasterly flow is feeding into these
storms, and strengthening westerly flow at mid/upper levels is
supporting around 35-40 kt of effective bulk shear. Given the
current cluster/linear mode, isolated severe wind gusts will likely
remain the primary severe threat for the next couple of hours. But,
some potential for marginally severe hail may also exist if an
embedded supercell develops. This cluster is forecast to move from
WW 231 into WW 232 within the next hour or so. WW 231 will be
locally extended in time by WFO EWX to account for the current storm
motion.
..Gleason.. 06/01/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CRP...EWX...
LAT...LON 28770055 29030015 29039952 28669879 28079894 27599966
27889996 28240026 28770055SPC 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, 2:50 AM CDT | Mesoscale Discussion | SPC | La Salle, McMullen, Webb | 85 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.