Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 730
The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 9:56 AM CDT for 26 counties in Texas. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2011, 9:56 AM CDT (14:56 UTC)
- Expired
- May 11, 2011, 11:30 AM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 26 counties
Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Edwards County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Somervell County, TX, Stephens County, TX, Sutton County, TX, Val Verde County, TX, Young County, TX
The radar
The San Angelo radar (KSJT), 97 km from the middle of the area, began a volume at 14:58 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 (KDRT), launched 12:00Z, 2.9 hours before the alert went out and 249 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
- 2847 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 565 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 3.3
- Supercell composite
- 15.6
The text
As transmitted, in the capitals the NWS used until 2016.
435 ACUS11 KWNS 111456 SWOMCD SPC MCD 111456 TXZ000-111630- MESOSCALE DISCUSSION 0730 NWS STORM PREDICTION CENTER NORMAN OK 0956 AM CDT WED MAY 11 2011 AREAS AFFECTED...CNTRL TX CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 111456Z - 111630Z STORMS MAY UNDERGO SOME INTENSIFICATION AS THEY DEVELOP EWD THROUGH CNTRL TX. INITIAL THREAT IS EXPECTED TO BE DAMAGING WIND AND LARGE HAIL...THOUGH A COUPLE OF TORNADOES CANNOT BE RULED OUT. AREA IS BEING MONITORED FOR A POSSIBLE WW. THIS MORNING STORMS CONTINUE DEVELOPING FROM NE OF SANDERSON TO NEAR ABILENE. THE ATMOSPHERE DOWNSTREAM IS MODERATELY UNSTABLE WITH STEEP MID LEVEL LAPSE RATES. HOWEVER...THE BOUNDARY LAYER HAS NOT UNDERGONE SIGNIFICANT DESTABILIZATION DUE TO TIME OF DAY AND SOME CONVECTIVE INHIBITION PERSISTS. THE STORMS APPEAR TO BE DEVELOPING WITHIN A ZONE OF PRE-FRONTAL CONVERGENCE FORCED BY AN EJECTING LEAD SHORTWAVE TROUGH. THE LLJ WILL GRADUALLY VEER AND SHIFT EWD AS THE IMPULSE CONTINUE NEWD THROUGH THE SRN/CNTRL PLAINS. THE STORMS WILL REMAIN EMBEDDED WITHIN EFFECTIVE SHEAR /35-45 KT/ SUFFICIENT FOR ORGANIZED STORMS WITH DAMAGING WIND AND LARGE HAIL EXPECTED TO BE THE INITIAL PRIMARY THREATS. ..DIAL.. 05/11/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...EWX...SJT... LAT...LON 29660046 30000157 33139902 33259781 31959753 29660046
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 2:28 AM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Borden, Briscoe, Carson, Castro and 31 more | 92 min |
| May 11, 3:29 AM CDT | Severe Thunderstorm Watch | SPC | Andrews, Armstrong, Bailey, Borden, Briscoe, Carson and 46 more | 8 hr |
| May 11, 7:30 AM CDT | Mesoscale Discussion | SPC | Armstrong, Borden, Briscoe, Carson, Childress, Coke and 43 more | 60 min |
| May 11, 10:21 AM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Brown, Burnet, Callahan, Coleman and 52 more | 5 hr |
| May 11, 1:16 PM CDT | Severe Thunderstorm Watch | SPC | Clay | 8 hr |
| May 11, 2:51 PM CDT | Mesoscale Discussion | SPC | Bosque, Bowie, Camp, Cass, Collin, Coryell and 31 more | 84 min |
| May 11, 3:46 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Blanco, Bosque, Bowie, Burnet and 44 more | 8 hr |
| May 11, 6:35 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Morris, Titus | 55 min |
Nearby
Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
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.