Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 2192
The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2011, 7:58 PM CDT for 30 counties in Texas. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2011, 7:58 PM CDT (00:58 UTC)
- Expired
- Sep 18, 2011, 9:00 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 30 counties
Bosque County, TX, Brown County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hamilton County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kimble County, TX, Lamar County, TX, Lampasas County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Parker County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Sutton County, TX, Tarrant County, TX, Wise County, TX
The radar
The Dyess AFB radar (KDYX), 108 km from the middle of the area, began a volume at 01:00 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 nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 1.0 hours before the alert went out and 185 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
- 2236 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1912 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.2
The text
As transmitted, in the capitals the NWS used until 2016.
167 ACUS11 KWNS 190058 SWOMCD SPC MCD 190058 TXZ000-OKZ000-190200- MESOSCALE DISCUSSION 2192 NWS STORM PREDICTION CENTER NORMAN OK 0758 PM CDT SUN SEP 18 2011 AREAS AFFECTED...PORTIONS OF N AND CNTRL TX CONCERNING...SEVERE THUNDERSTORM WATCH 853... VALID 190058Z - 190200Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 853 CONTINUES. WITH EXCEPTION TO NRN PORTIONS OF THE WW NEAR THE RED RIVER...CONVECTION HAS LARGELY STRUGGLED TO INTENSIFY AND INCREASE IN AREAL COVERAGE ACROSS MUCH OF THE WW AREA. THIS IS PROBABLY DUE TO RATHER WEAK LOW-LEVEL CONVERGENCE ALONG A SLOW-MOVING SFC COLD FRONT...AS WELL AS THE ABSENCE OF ANY SIGNIFICANT FORCED ASCENT ALOFT AS PRIMARY UPPER WAVE REMAINS SITUATED ACROSS ERN OK. LATEST RADAR IMAGERY CONTINUES TO INDICATE STRONGEST CLUSTER OF TSTMS IS LOCATED N/E OF THE DFW METROPLEX AND IS PROGRESSING ESEWD...WITH CONTINUED POTENTIAL FOR DMGG WINDS AND LARGE HAIL. FARTHER S...ISOLATED TSTMS ARE PERSISTING WITHIN AN UNSTABLE AIR MASS...BUT WITH THE LOSS OF DIABATIC HEATING THE ENVIRONMENT SHOULD GRADUALLY BECOME LESS FAVORABLE FOR SUSTAINING A THREAT FOR DMGG WINDS/LARGE HAIL. COLD FRONT IS NOW SITUATED FROM NEAR 6R6-10 W BWD-20 N FTW /PER 00Z SUBJECTIVE ANALYSIS/...WITH DRIER/MORE STABLE AIR SLOWLY ADVECTING SEWD IN ITS WAKE. ..ROGERS.. 09/19/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...FWD...OUN...EWX...SJT... LAT...LON 30260105 33829714 33829507 30259928 30260105
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 10:31 PM CDT | Mesoscale Discussion | SPC | Anderson, Bosque, Cass, Cherokee, Ellis, Freestone and 17 more | 59 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.