Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 2302
The Storm Prediction Center issued this mesoscale discussion at Nov 8, 2011, 1:03 PM CST for 4 states. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Nov 8, 2011, 1:03 PM CST (19:03 UTC)
- Expired
- Nov 8, 2011, 2:00 PM CST
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 67 counties
Calhoun County, AR, Clark County, AR, Columbia County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, Van Buren County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Webster Parish, LA, Choctaw County, OK, McCurtain County, OK, Anderson County, TX, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 88 km from the middle of the area, began a volume at 19:07 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
Shreveport, LA (KSHV), launched 12:00Z, 7.1 hours before the alert went out and 88 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
- 12 J/kg
- Mixed-layer CIN
- -185 J/kg
- Mixed-layer LCL
- 496 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 296 m²/s²
- 0-3 km storm-relative helicity
- 361 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
385
ACUS11 KWNS 081904
SWOMCD
SPC MCD 081903
ARZ000-LAZ000-TXZ000-OKZ000-082000-
MESOSCALE DISCUSSION 2302
NWS STORM PREDICTION CENTER NORMAN OK
0103 PM CST TUE NOV 08 2011
AREAS AFFECTED...SERN OK...WRN/CENTRAL AR...NERN TX AND NWRN LA
CONCERNING...TORNADO WATCH 875...
VALID 081903Z - 082000Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 875 CONTINUES.
STRONGEST FORCING ASSOCIATED WITH UPPER WAVE IN THE TX PANHANDLE WAS
MOVING EWD THROUGH CENTRAL/NRN AR. DESPITE WEAK INSTABILITY
...MUCAPES FROM 250-500 J/KG...DEEP/LOW LEVEL SHEAR AT 50KT/40 KT
RESPECTIVELY ARE SUPPORTIVE OF ROTATING STORMS/BOWS...WITH WIND
DAMAGE AND EVEN A TORNADO OR TWO EXPECTED AS THE STORMS SHIFT EWD
THROUGH THE AFTERNOON.
FURTHER SWWD...A COLD FRONT WAS NEAR A DUA-AUS LINE...WITH A
A WEAK E-W ORIENTED FRONT LOCATED IN CENTRAL AR. EAST AND SOUTH OF
THESE FRONTS...TEMPERATURES HAD WARMED INTO THE LOWER/MID
70S...RESULTING IN STRONGER INSTABILITY...MUCAPES AROUND 1500 J/KG.
CONVECTION HAS INCREASED IN COVERAGE AND INTENSITY DURING THE PAST
HOUR AS THE AIR MASS HAS DESTABILIZED. WITH ADDITIONAL HEATING AND
DEEP LAYER SHEAR AT 40-50 KT...A FEW SUPERCELLS ARE LIKELY TO EVOLVE
THROUGH THE AFTERNOON. THE STRONG WIND FIELDS SUGGEST WIND DAMAGE
SHOULD BE THE PRIMARY THREAT...THOUGH 20-30 KT LOW LEVEL SHEAR AND A
MOIST ENVIRONMENT WILL ALSO SUPPORT TORNADOES.
..IMY.. 11/08/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SHV...TSA...HGX...FWD...OUN...
LAT...LON 31169527 31399643 34109584 34519487 35469373 35649218
35169192 34069223 31419351 31189429 31169527SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 8, 1:17 AM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 16 more | 118 min |
| Nov 8, 9:38 AM CST | Mesoscale Discussion | SPC | Crawford, Franklin, Sebastian | 67 min |
| Nov 8, 10:31 AM CST | Mesoscale Discussion | SPC | Baxter, Clark, Cleburne, Columbia, Conway, Dallas and 31 more | 29 min |
| Nov 8, 10:49 AM CST | Tornado Watch | SPC | Clark, Cleburne, Columbia, Conway, Dallas, Faulkner and 25 more | 7 hr |
| Nov 8, 3:48 PM CST | Mesoscale Discussion | SPC | Clark, Cleburne, Columbia, Conway, Faulkner, Garland and 18 more | 87 min |
| Nov 8, 5:09 PM CST | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 7 more | 66 min |
| Nov 8, 5:30 PM CST | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 17 more | 7 hr |
| Nov 7, 7:43 PM CST | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Creek and 22 more | 62 min |
| Nov 7, 8:28 PM CST | Tornado Watch | SPC | Adair, Caddo, Canadian, Carter, Cherokee, Cleveland and 36 more | 8 hr |
| Nov 7, 11:20 PM CST | Mesoscale Discussion | SPC | Carter, Cherokee, Cleveland, Cotton, Craig, Creek and 22 more | 85 min |
| Nov 8, 2:12 AM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 4 more | 93 min |
| Nov 7, 6:44 PM CST | Tornado Watch | SPC | Bosque, Camp, Collin, Cooke, Coryell, Dallas and 24 more | 2 hr |
| Nov 7, 8:53 PM CST | Mesoscale Discussion | SPC | Borden, Coke, Fisher, Glasscock, Haskell, Howard and 9 more | 2 hr |
| Nov 7, 9:16 PM CST | Tornado Watch | SPC | Borden, Callahan, Coke, Coleman, Concho, Crane and 31 more | 8 hr |
| Nov 8, 1:44 PM CST | Mesoscale Discussion | SPC | Austin, Chambers, Grimes, Hardin, Harris, Jasper and 10 more | 61 min |
| Nov 8, 1:59 PM CST | Tornado Watch | SPC | Chambers, Grimes, Hardin, Harris, Houston, Jasper and 12 more | 6 hr |
| Nov 8, 3:53 PM CST | Mesoscale Discussion | SPC | Angelina, Grimes, Hardin, Harris, Jasper, Liberty and 7 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Louisiana, 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.