Alert archive / Texas / Mesoscale Discussions in 2019
Mesoscale Discussion 521
The Storm Prediction Center issued this mesoscale discussion at May 3, 2019, 6:48 PM CDT for 22 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- May 3, 2019, 6:48 PM CDT (23:48 UTC)
- Expired
- May 3, 2019, 7:45 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 22 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Fayette County, TX, Frio County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Lavaca County, TX, Lee County, TX, Medina County, TX, Travis County, TX, Uvalde County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 63 km from the middle of the area, began a volume at 23:48 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Del Rio, TX (KDLF), launched 12:00Z, 11.8 hours before the alert went out and 211 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
- 478 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 536 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted.
895
ACUS11 KWNS 032348
SWOMCD
SPC MCD 032348
TXZ000-040045-
Mesoscale Discussion 0521
NWS Storm Prediction Center Norman OK
0648 PM CDT Fri May 03 2019
Areas affected...south central Texas
Concerning...Severe Thunderstorm Watch 127...
Valid 032348Z - 040045Z
The severe weather threat for Severe Thunderstorm Watch 127
continues.
SUMMARY...Storms will remain capable of producing damaging wind and
large hail over south central Texas through the evening.
DISCUSSION...Early this evening numerous storms persist over south
central Texas from Austin to near Del Rio. Storms remain within an
environment characterized by moderate instability and effective bulk
shear from 35-45 kt, but low-level hodographs are small. This
environment will continue to support some supercell structures, but
numerous storm mergers are occurring and an upscale linear growth
appears to be in progress. The cap is relatively weak in the
downstream warm sector, and storms will continue to forward
propagate as the cold pools consolidate. Both damaging wind and
large hail remain likely, but damaging wind may become the dominant
threat as storms evolve into a linear mode.
..Dial.. 05/03/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...HGX...CRP...EWX...
LAT...LON 29640043 30089893 30569775 30369685 29439678 28619797
28830030 29640043SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 10:26 PM CDT | Mesoscale Discussion | SPC | Brewster, Dimmit, Kinney, Maverick, Terrell, Val Verde and 2 more | 2 hr |
| May 3, 5:45 AM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Kleberg and 3 more | 60 min |
| May 3, 6:13 AM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 8 more | 5 hr |
| May 3, 7:39 AM CDT | Mesoscale Discussion | SPC | Colorado, DeWitt, Fayette, Lavaca | 66 min |
| May 3, 9:59 AM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 4 more | 16 min |
| May 3, 12:20 PM CDT | Mesoscale Discussion | SPC | Fort Bend, Harris, Waller | 2 hr |
| May 3, 1:26 PM CDT | Mesoscale Discussion | SPC | Andrews, Bailey, Brewster, Cochran, Crane, Dawson and 15 more | 3 hr |
| May 3, 3:26 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Bailey, Borden, Brewster, Castro, Cochran and 25 more | 6 hr |
| May 3, 4:23 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Blanco, Comal, Dimmit and 16 more | 67 min |
| May 3, 4:35 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 31 more | 6 hr |
| May 3, 5:58 PM CDT | Mesoscale Discussion | SPC | Andrews, Bailey, Cochran, Crane, Dawson, Ector and 10 more | 92 min |
Nearby
Mesoscale Discussions in Texas, 2019Every mesoscale discussion in 2019
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.