Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 2189
The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2011, 3:59 PM CDT for Love County, Oklahoma; 52 counties in Texas. It was in force for 31 min.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2011, 3:59 PM CDT (20:59 UTC)
- Expired
- Sep 18, 2011, 4:30 PM CDT
- In force
- 31 min
- Issued by
- the Storm Prediction Center
All 53 counties
Love County, OK, Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Mills County, TX, Montague County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Runnels County, TX, San Saba County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 89 km from the middle of the area, began a volume at 21:01 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
Fort Worth, TX (KFWD), launched 12:00Z, 9.0 hours before the alert went out and 113 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
- 581 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 1222 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
380
ACUS11 KWNS 182100
SWOMCD
SPC MCD 182059
OKZ000-TXZ000-182130-
MESOSCALE DISCUSSION 2189
NWS STORM PREDICTION CENTER NORMAN OK
0359 PM CDT SUN SEP 18 2011
AREAS AFFECTED...NRN/CNTRL TX
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 182059Z - 182130Z
THUNDERSTORM DEVELOPMENT IS POSSIBLE OVER PORTIONS OF NRN/CNTRL TX
DURING THE NEXT FEW HRS. ENVIRONMENT SUPPORTS SVR STORMS POSING A
THREAT OF LARGE HAIL AND DAMAGING WINDS. WW IS LIKELY.
AT 20Z...SURFACE COLD FRONT EXTENDED SWWD FROM NERN OK INTO PORTIONS
OF CNTRL TX. RECENT VIS SATELLITE IMAGERY SHOWS GENERALLY FLAT CU
FIELD ALONG/AHEAD OF THE FRONT...WITH THE EXCEPTION OF A FEW
TOWERING CUMULUS NEAR THE RED RIVER. THOUGH BOUNDARY LAYER HAS
SLOWLY DESTABILIZED DURING THE AFTERNOON...UPPER VORT LOBE IS
SITUATED IMMEDIATELY ABOVE THE REGION...LEADING TO NEGLIGIBLE
LARGE-SCALE ASCENT. THUS...THUNDERSTORM INITIATION AND SUBSEQUENT
COVERAGE IS UNCERTAIN ATTM DURING THE SHORT TERM.
NEVERTHELESS...ENVIRONMENT IS QUITE MOIST AND UNSTABLE...WITH MLCAPE
VALUES NEAR 2500 J/KG. THIS INSTABILITY COMBINED WITH MODEST
VERTICAL SHEAR PROFILES WOULD BE SUFFICIENT FOR SVR MULTICELL
THUNDERSTORMS...POSING A LARGE HAIL AND DAMAGING WIND THREAT. GIVEN
RECENT TRENDS IN VIS SATELLITE IMAGERY...AREA MAY REQUIRE A WW
DURING THE NEXT HR.
..GARNER.. 09/18/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...TSA...FWD...OUN...EWX...SJT...
LAT...LON 31700069 33189925 33989738 33939504 32609508 30859835
30730024 31700069SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 10:17 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cherokee, Cleveland, Coal and 28 more | 88 min |
| Sep 18, 2:45 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Craig, Delaware, Haskell and 14 more | 2 hr |
| Sep 18, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 24 more | 8 hr |
| Sep 18, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | McCurtain | 7 hr |
| Sep 18, 6:48 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 20 more | 57 min |
| Sep 18, 4:06 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bosque, Brown, Callahan, Coke, Coleman and 51 more | 9 hr |
| Sep 18, 6:18 PM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Comal, Edwards, Hays and 6 more | 57 min |
Nearby
Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Oklahoma, 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.