Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 984
The Storm Prediction Center issued this mesoscale discussion at May 30, 2012, 4:52 PM CDT for 23 counties in Texas. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- May 30, 2012, 4:52 PM CDT (21:52 UTC)
- Expired
- May 30, 2012, 6:15 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 23 counties
Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Eastland County, TX, Fisher County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, McCulloch County, TX, Menard County, TX, Mitchell County, TX, Nolan County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Scurry County, TX, Shackelford County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Tom Green County, TX
The radar
The San Angelo radar (KSJT), 59 km from the middle of the area, began a volume at 21:54 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
Midland Regional, TX (KMAF), launched 12:00Z, 9.9 hours before the alert went out and 203 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
- 1761 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 1809 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
964
ACUS11 KWNS 302152
SWOMCD
SPC MCD 302152
TXZ000-302315-
MESOSCALE DISCUSSION 0984
NWS STORM PREDICTION CENTER NORMAN OK
0452 PM CDT WED MAY 30 2012
AREAS AFFECTED...W CNTRL TX
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 302152Z - 302315Z
PROBABILITY OF WATCH ISSUANCE...95 PERCENT
SUMMARY...ISOLATED SUPERCELLS ARE LIKELY TO FORM AND PERSIST OVER
THE NEXT FEW HOURS...WITH A DISTINCT GIANT HAIL...DAMAGING WIND AND
ISOLATED TORNADO THREAT.
DISCUSSION...STORMS ARE BEGINNING TO ERUPT ALONG THE DRYLINE WHERE
TEMPERATURES EXCEED 100 F. MEANWHILE...SELY SURFACE WINDS ARE
MAINTAINING MID 60S F DEWPOINTS...CREATING EXTREME INSTABILITY WHEN
COUPLED WITH STEEP LAPSE RATE PROFILES ALOFT.
THE TURNING WINDS WITH HEIGHT ARE ALSO FAVORABLE FOR
SUPERCELLS...AND DESPITE MARGINAL T/TD SPREADS INITIALLY....A
TORNADO OR TWO IS POSSIBLE. LOCALLY SIGNIFICANT DAMAGING WINDS MAY
ALSO OCCUR BENEATH THESE SUPERCELLS.
..JEWELL/CORFIDI.. 05/30/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...EWX...SJT...LUB...MAF...
LAT...LON 31190156 31780108 32460096 32880099 33399997 33059951
32269862 31659870 30929866 30749906 30709984 30690031
31190156SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 8:54 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Denton, Hood, Jack, Johnson and 6 more | 96 min |
| May 29, 11:28 PM CDT | Mesoscale Discussion | SPC | Cooke, Fannin, Grayson, Lamar, Montague | 62 min |
| May 30, 12:43 AM CDT | Severe Thunderstorm Watch | SPC | Camp, Collin, Cooke, Dallas, Delta, Denton and 19 more | 7 hr |
| May 30, 2:43 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Camp, Cass, Clay, Collin and 37 more | 92 min |
| May 30, 5:07 AM CDT | Mesoscale Discussion | SPC | Anderson, Camp, Cherokee, Collin, Dallas, Denton and 28 more | 83 min |
| May 30, 2:58 PM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Dickens, Donley and 8 more | 62 min |
| May 30, 3:38 PM CDT | Tornado Watch | SPC | Baylor, Briscoe, Childress, Collingsworth, Cottle, Dickens and 15 more | 5 hr |
| May 30, 5:11 PM CDT | Tornado Watch | SPC | Brown, Burnet, Callahan, Coke, Coleman, Comanche and 27 more | 6 hr |
| May 30, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Cooke, Denton, Jack and 5 more | 8 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.