Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 913
The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 9:41 PM CDT for 9 counties in Texas. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2017, 9:41 PM CDT (02:41 UTC)
- Expired
- May 28, 2017, 10:45 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
Counties Brooks County, TX, Duval County, TX, Jim Hogg County, TX, Jim Wells County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Webb County, TX, Zapata County, TX
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 00:00Z, 2.7 hours before the alert went out and 175 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
- 2745 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1028 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
043 ACUS11 KWNS 290241 SWOMCD SPC MCD 290241 TXZ000-290345- Mesoscale Discussion 0913 NWS Storm Prediction Center Norman OK 0941 PM CDT Sun May 28 2017 Areas affected...South TX Concerning...Severe Thunderstorm Watch 297... Valid 290241Z - 290345Z The severe weather threat for Severe Thunderstorm Watch 297 continues. SUMMARY...Isolated severe threat continues in the short term across the northwestern half of WW297. DISCUSSION...Thunderstorms have been slow to advance east across Webb/La Salle Counties this evening. However, additional convection upstream is approaching this nearly stationary activity and some southeastward movement may occur over the next hour or so. Considerable moisture/instability reside across south TX and an MCS may ultimately evolve across this region. ..Darrow.. 05/29/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CRP...EWX...BRO... LAT...LON 28279983 28739804 27019803 26539984 28279983
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Hardin, Jasper, Newton, Orange, Tyler | 6 hr |
| May 28, 7:19 PM CDT | Mesoscale Discussion | SPC | Duval, Jim Hogg, La Salle, Live Oak, McMullen, Webb and 1 more | 56 min |
| May 28, 7:34 PM CDT | Mesoscale Discussion | SPC | Cherokee, Gregg, Harrison, Houston, Nacogdoches, Panola and 5 more | 56 min |
| May 28, 7:40 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 10 more | 8 hr |
| May 28, 9:16 PM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Newton, Orange, Sabine, Tyler | 59 min |
| May 29, 2:02 AM CDT | Mesoscale Discussion | SPC | Aransas, Brooks, Cameron, Duval, Hidalgo, Jim Wells and 6 more | 118 min |
Nearby
Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017
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.