Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 990
The Storm Prediction Center issued this mesoscale discussion at May 30, 2012, 10:15 PM CDT for 28 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 30, 2012, 10:15 PM CDT (03:15 UTC)
- Expired
- May 31, 2012, 12:15 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 28 counties
Blanco County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Fisher County, TX, Gillespie County, TX, Haskell County, TX, Jones County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Nolan County, TX, Runnels County, TX, San Saba County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 55 km from the middle of the area, began a volume at 03:17 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, 3.3 hours before the alert went out and 232 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
- 451 J/kg
- Mixed-layer CIN
- -374 J/kg
- Mixed-layer LCL
- 2223 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -119 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
467 ACUS11 KWNS 310315 SWOMCD SPC MCD 310315 TXZ000-310515- MESOSCALE DISCUSSION 0990 NWS STORM PREDICTION CENTER NORMAN OK 1015 PM CDT WED MAY 30 2012 AREAS AFFECTED...WEST CENTRAL TEXAS CONCERNING...TORNADO WATCH 324... VALID 310315Z - 310515Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 324 CONTINUES. SUMMARY...SEVERE THREAT HAS TRANSITIONED TO MAINLY A LARGE HAIL AND STRONG WIND THREAT FROM EARLIER TORNADO THREAT. STORMS MAY CONTINUE TO PRODUCE LARGE HAIL/GUSTY WINDS FOR THE NEXT FEW HOURS. DISCUSSION...TWO STORMS IN THE WATCH AREA CONTINUE TO BE THE MAIN AREAS OF CONCERN. ONE STORM IS ACROSS THE NRN WATCH AREA IN SOUTHWESTERN THROCKMORTON COUNTY WHILE THE SECOND STORM IS FURTHER SOUTH OVER MASON COUNTY. WHILE BOTH OF THESE STORMS EARLIER HAD TORNADO WARNINGS AND LIKELY TORNADOES OCCURRING...THE THREAT HAS LARGELY TRANSITIONED TO A HAIL AND STRONG WIND THREAT. ADDITIONALLY...IR IMAGERY HAS SHOWN A WARMING OF CLOUD TOPS OVER THE LAST HOUR OR SO AND A GENERAL WEAKENING TREND MAY OCCUR OVER THE NEXT 2-3 HOURS. CONVECTIVE TRENDS WILL BE MONITORED TO EVALUATE THE NEED OF POSSIBLE WATCH EXTENSION OR NEW WW ISSUANCE AS WW 324 EXPIRES AT 05Z. ..LEITMAN.. 05/31/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN...EWX...SJT...LUB... LAT...LON 33410070 33439859 30259807 30260008 33410070
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 7:37 PM CDT | Mesoscale Discussion | SPC | Blanco, Brown, Burnet, Callahan, Coleman, Comanche and 22 more | 113 min |
| May 30, 8:38 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 13 more | 97 min |
| May 31, 6:02 AM CDT | Mesoscale Discussion | SPC | Brazos, Falls, Freestone, Houston, Leon, Limestone and 5 more | 88 min |
| May 31, 9:47 AM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Harris, Jasper, Jefferson, Liberty and 5 more | 58 min |
| May 31, 10:41 AM CDT | Severe Thunderstorm Watch | SPC | Hardin, Jasper, Jefferson, Newton, Orange | 6 hr |
| May 31, 6:21 PM CDT | Mesoscale Discussion | SPC | Brewster, Jeff Davis, Pecos, Presidio, Reeves | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2012Every mesoscale discussion in 2012
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.