Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 726
The Storm Prediction Center issued this mesoscale discussion at May 24, 2021, 6:44 PM CDT for 20 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- May 24, 2021, 6:44 PM CDT (23:44 UTC)
- Expired
- May 24, 2021, 8:15 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 201
Counties Armstrong County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Crosby County, TX, Dawson County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Hale County, TX, Hockley County, TX, Hutchinson County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Moore County, TX, Potter County, TX, Randall County, TX, Swisher County, TX, Terry County, TX
The radar
The Lubbock radar (KLBB), 45 km from the middle of the area, began a volume at 23:44 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 11.7 hours before the alert went out and 132 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
- 491 J/kg
- Mixed-layer CIN
- -250 J/kg
- Mixed-layer LCL
- 1035 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
869
ACUS11 KWNS 242344
SWOMCD
SPC MCD 242344
TXZ000-250115-
Mesoscale Discussion 0726
NWS Storm Prediction Center Norman OK
0644 PM CDT Mon May 24 2021
Areas affected...west Texas
Concerning...Severe Thunderstorm Watch 201...
Valid 242344Z - 250115Z
The severe weather threat for Severe Thunderstorm Watch 201
continues.
SUMMARY...Isolated large hail and downburst winds remain likely with
storms developing across west Texas through 01Z. Primary threat will
probably transition to damaging wind toward mid evening.
DISCUSSION...Scattered thunderstorms continue developing along the
dryline across west Texas where the strongest heating, mixing and
convergence has occurred west of the Lubbock area. Farther north the
19Z RAOB from Amarillo showed a pronounced capping inversion, and
thunderstorm development has been delayed due in part to somewhat
cooler surface temperatures. VWP data indicate weak effective bulk
shear on the order of 25 kt supporting mostly multicells. However,
up to 35 kt effective bulk shear with northward extent toward the
Panhandle might support some marginal supercell structures. Visible
satellite imagery shows a westward-moving boundary from the eastern
TX Panhandle southward through northwest TX. This boundary
demarcates the westward surge of higher dewpoints. It is likely that
this feature will eventually merge with some of the outflows
produced by the storms in west TX, at which time a rapid upscale
growth into a liner MCS might occur toward mid evening. The MCS
could be sustained into a portion of the overnight by a
strengthening southerly low-level jet.
..Dial.. 05/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LUB...AMA...MAF...
LAT...LON 32850281 34090240 35280238 35910203 35970140 35630111
34850096 33460107 32900133 32440194 32460250 32850281SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 7:32 PM CDT | Mesoscale Discussion | SPC | Dallam, Deaf Smith, Hartley, Oldham, Sherman | 118 min |
| May 24, 3:07 PM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Borden, Briscoe, Carson, Castro and 38 more | 113 min |
| May 24, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Armstrong, Bailey, Borden, Briscoe, Carson and 34 more | 7 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.