Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 975
The Storm Prediction Center issued this mesoscale discussion at May 30, 2012, 2:43 AM CDT for Cotton County, Tillman County, Oklahoma; 43 counties in Texas. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- May 30, 2012, 2:43 AM CDT (07:43 UTC)
- Expired
- May 30, 2012, 4:15 AM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 45 counties
Cotton County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Camp County, TX, Cass County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Henderson County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Morris County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Throckmorton County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Wood County, TX, Young County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 98 km from the middle of the area, began a volume at 07:44 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, 7.7 hours before the alert went out and 70 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
- 1364 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 2060 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.6
The text
As transmitted, in the capitals the NWS used until 2016.
950
ACUS11 KWNS 300743
SWOMCD
SPC MCD 300743
TXZ000-OKZ000-300915-
MESOSCALE DISCUSSION 0975
NWS STORM PREDICTION CENTER NORMAN OK
0243 AM CDT WED MAY 30 2012
AREAS AFFECTED...0NRN/CNTRL TX
CONCERNING...SEVERE THUNDERSTORM WATCH 320...
VALID 300743Z - 300915Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 320
CONTINUES.
SUMMARY...SEVERE POTENTIAL CONTINUES...BUT APPEARS TO BE IN THE
PROCESS OF BECOMING INCREASINGLY ISOLATED...AND PRIMARILY IN THE
FORM OF LARGE HAIL. LOCALIZED STRONG WIND GUSTS REMAIN POSSIBLE
HOWEVER ...AT LEAST ANOTHER COUPLE OF HOURS.
DISCUSSION...07Z SURFACE ANALYSIS INDICATES STRONGER 2 HOUR PRESSURE
RISES HAVE SHIFTED SOUTH OF THE RED RIVER...BUT THE ASSOCIATED MESO
HIGH ...CENTERED OVER SOUTHEAST OKLAHOMA...APPEARS TO BE IN THE
PROCESS OF GRADUALLY WEAKENING. BROADER SCALE DAMAGING WIND
POTENTIAL PROBABLY IS DIMINISHING...BUT SCATTERED VIGOROUS
CONVECTIVE DEVELOPMENT CONTINUES...ALONG/NORTH OF WAVES GENERATED
AHEAD OF THE LEADING EDGE OF THE SOUTHWARD ADVANCING OUTFLOW...WHICH
COULD IMPACT THE DALLAS/FORT WORTH METROPLEX DURING THE NEXT COUPLE
OF HOURS. STRONGEST STORMS...WITH GREATEST POTENTIAL FOR LARGE
HAIL...APPEAR TO BE ON THE WESTERN FLANK...PERHAPS ENHANCED BY THE
NOSE OF MODERATELY STRONG WEST CENTRAL/NORTHWEST TEXAS LOW-LEVEL
JET...GRADUALLY VEERING FROM SOUTHERLY TO SOUTHWESTERLY.
..KERR.. 05/30/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...FWD...OUN...SJT...
LAT...LON 34589850 33959781 33619706 33679627 33719551 33619468
33139414 32289471 31909623 32219783 32789885 33319943
34039964 34499920 34589850SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 7:33 PM CDT | Severe Thunderstorm Watch | SPC | Choctaw, Creek, Haskell, Latimer, LeFlore, McIntosh and 11 more | 5 hr |
| May 29, 8:21 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 32 more | 54 min |
| May 29, 9:10 PM CDT | Mesoscale Discussion | SPC | Atoka, Canadian, Carter, Cleveland, Coal, Garvin and 10 more | 95 min |
| May 29, 11:28 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 17 more | 62 min |
| May 30, 12:43 AM CDT | Severe Thunderstorm Watch | SPC | McCurtain | 7 hr |
| May 30, 3:38 PM CDT | Tornado Watch | SPC | Beaver, Harmon | 5 hr |
| May 30, 5:47 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Comanche, Custer, Dewey, Ellis and 10 more | 88 min |
| May 30, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 37 more | 8 hr |
| May 29, 8:54 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Denton, Hood, Jack, Johnson and 6 more | 96 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, 4:52 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Concho, Eastland and 17 more | 83 min |
| May 30, 5:11 PM CDT | Tornado Watch | SPC | Brown, Burnet, Callahan, Coke, Coleman, Comanche and 27 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 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.