Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 903
The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 4:58 PM CDT for 8 counties in Texas. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2011, 4:58 PM CDT (21:58 UTC)
- Expired
- May 23, 2011, 6:00 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
Counties Brown County, TX, Callahan County, TX, Coleman County, TX, Eastland County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Young County, TX
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 10.0 hours before the alert went out and 198 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
- 2692 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 610 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 387 m²/s²
- 0-3 km storm-relative helicity
- 362 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 15.4
The text
As transmitted, in the capitals the NWS used until 2016.
887 ACUS11 KWNS 232159 SWOMCD SPC MCD 232158 TXZ000-232300- MESOSCALE DISCUSSION 0903 NWS STORM PREDICTION CENTER NORMAN OK 0458 PM CDT MON MAY 23 2011 AREAS AFFECTED...W-CNTRL THROUGH NWRN TX CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 232158Z - 232300Z STORMS MAY DEVELOP SWD THROUGH W-CNTRL TX WITH TIME...POSSIBLY TO JUST NE OF SAN ANGELO. SUPERCELLS WITH LARGE HAIL WILL BE LIKELY WITH ISOLATED TORNADOES ALSO POSSIBLE. AREA IS BEING MONITORED FOR A POSSIBLE WW. LATEST VISIBLE IMAGERY INDICATES CUMULUS INCREASING ALONG THE DRYLINE FROM NWRN TX SWD TO NEAR SAN ANGELO. A RETREATING BOUNDARY DEMARCATING MOISTER AND VERY UNSTABLE AIR TO THE EAST WAS ALSO OBSERVED AND WILL LIKELY MERGE WITH THE DRYLINE WITHIN THE NEXT HOUR. AUGMENTED MOISTURE CONVERGENCE WITH THIS PROCESS MAY SUPPORT ADDITIONAL SWD DEVELOPMENT. LOW LEVEL HODOGRAPHS ARE NOT PARTICULARLY LARGE...BUT EFFECTIVE BULK SHEAR PROFILES SUPPORT SUPERCELLS STORM STRUCTURES. ..DIAL.. 05/23/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN...SJT... LAT...LON 31419985 33029962 33409902 33029833 31319908 31419985
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 8:10 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Clay, Collin, Comanche and 34 more | 65 min |
| May 22, 8:59 PM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Collin, Comanche, Coryell, Dallas and 28 more | 2 hr |
| May 23, 9:57 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Dallas, Delta and 30 more | 33 min |
| May 23, 9:59 AM CDT | Severe Thunderstorm Watch | SPC | Bosque, Collin, Comanche, Cooke, Dallas, Delta and 29 more | 6 hr |
| May 23, 12:10 PM CDT | Mesoscale Discussion | SPC | Anderson, Bosque, Bowie, Camp, Cass, Cherokee and 46 more | 65 min |
| May 23, 2:08 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Childress, Cottle, Foard, Hardeman and 11 more | 97 min |
| May 23, 2:30 PM CDT | Tornado Watch | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 8 hr |
| May 23, 6:51 PM CDT | Mesoscale Discussion | SPC | Archer, Clay, Wichita | 84 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.