Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 768
The Storm Prediction Center issued this mesoscale discussion at May 12, 2011, 6:30 PM CDT for 5 states. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- May 12, 2011, 6:30 PM CDT (23:30 UTC)
- Expired
- May 12, 2011, 8:00 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 61 counties
Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Cherokee County, KS, Barry County, MO, Christian County, MO, Douglas County, MO, Greene County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK, Cooke County, TX, Fannin County, TX, Grayson County, TX, Lamar County, TX
The radar
The Tulsa radar (KINX), 126 km from the middle of the area, began a volume at 23:31 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
Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 149 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
- 1116 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 682 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
596
ACUS11 KWNS 122330
SWOMCD
SPC MCD 122330
MOZ000-ARZ000-OKZ000-KSZ000-TXZ000-130100-
MESOSCALE DISCUSSION 0768
NWS STORM PREDICTION CENTER NORMAN OK
0630 PM CDT THU MAY 12 2011
AREAS AFFECTED...FAR NORTHEAST TX AND EASTERN/SOUTH-CENTRAL OK TO
FAR SOUTHEAST KS AND WESTERN AR/SOUTHWEST MO
CONCERNING...SEVERE THUNDERSTORM WATCH 293...
VALID 122330Z - 130100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 293
CONTINUES.
SEVERE TSTM WATCH 293 CONTINUES UNTIL 03Z. LARGE HAIL REMAINS THE
PRIMARY RISK...BUT DAMAGING WINDS/PERHAPS A TORNADO ARE POSSIBLE AS
WELL.
SCATTERED TSTMS CONTINUE TO DEVELOP ALONG AND EAST OF A WEAK COLD
FRONT/DRYLINE THAT EXTENDS NORTHEAST-SOUTHWESTWARD FROM FAR
SOUTHEAST KS INTO EAST-CENTRAL/SOUTHERN OK AND NORTH TX. WHILE MUCH
OF THE WARM SECTOR IS MODERATELY UNSTABLE /2000-3000 J PER KG
MLCAPE/...THE MOST VIGOROUS TSTMS CONTINUE TO DEVELOP FROM
NEAR/NORTH OF I-40 IN FAR EASTERN OK/WESTERN AR...NORTHEASTWARD TO
BETWEEN I-44/I-70 IN SOUTHWEST/WEST-CENTRAL MO. THIS IS PERHAPS AT
LEAST PARTIALLY ATTRIBUTABLE TO MORE APPRECIABLE DPVA WHILE ALSO
BEING MORE REMOVED FROM A DENSE EASTERN TX CIRRUS CANOPY.
REGARDLESS...LARGE HAIL WILL REMAIN THE PRIMARY CONCERN THROUGH
EARLY/MID EVENING...WITH BOUTS OF DAMAGING WINDS AS WELL ESPECIALLY
AS STORMS CONTINUE TO CONGEAL WITHIN A MOIST/STEEP LAPSE RATE
ENVIRONMENT. EVEN WITH A FAVORABLE ENVIRONMENT FOR SUSTAINED
SUPERCELLS...ANY TORNADOES ARE EXPECTED TO BE RATHER BRIEF/ISOLATED
IN NATURE GIVEN THE LOW LEVEL FLOW WEAKNESS NOTED IN REGIONAL
PROFILERS/WSR-88D VWP DATA.
..GUYER.. 05/12/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SGF...SHV...TSA...ICT...FWD...OUN...
LAT...LON 33419772 34549741 35769630 37449462 37139186 33719477
33419772SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:43 PM CDT | Mesoscale Discussion | SPC | Clark, Conway, Faulkner, Garland, Hempstead, Hot Spring and 12 more | 62 min |
| May 12, 1:46 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Franklin, Madison, Sebastian, Washington | 119 min |
| May 12, 3:17 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Conway, Crawford and 20 more | 7 hr |
| May 11, 7:51 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Norton, Rawlins, Sherman, Thomas | 84 min |
| May 11, 8:16 PM CDT | Mesoscale Discussion | SPC | Brown, Nemaha | 59 min |
| May 12, 2:37 PM CDT | Tornado Watch | SPC | Cloud, Jewell, Mitchell, Phillips, Republic, Smith and 1 more | 7 hr |
| May 12, 4:54 PM CDT | Mesoscale Discussion | SPC | Atchison, Douglas, Jefferson, Johnson, Leavenworth, Linn and 2 more | 66 min |
| May 12, 5:31 PM CDT | Severe Thunderstorm Watch | SPC | Linn, Miami | 6 hr |
| May 11, 11:25 PM CDT | Mesoscale Discussion | SPC | Austin, Bandera, Bastrop, Bexar, Brazos, Burleson and 27 more | 65 min |
| May 12, 2:57 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 25 more | 33 min |
| May 12, 3:18 AM CDT | Severe Thunderstorm Watch | SPC | Bandera, Dimmit, Edwards, Frio, Kerr, Kinney and 7 more | 5 hr |
| May 12, 7:27 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bee, Bexar, Brooks, Dimmit and 26 more | 33 min |
| May 12, 7:52 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Bandera, Bee, Bexar, Brooks and 33 more | 9 hr |
| May 12, 8:46 AM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Bosque, Brazos, Burleson, Caldwell and 22 more | 59 min |
| May 12, 9:02 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Austin, Bastrop, Bell, Blanco, Bosque and 53 more | 6 hr |
| May 12, 11:43 AM CDT | Mesoscale Discussion | SPC | Anderson, Aransas, Austin, Bee, Brazos, Burleson and 33 more | 92 min |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Missouri, 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.