Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 124
The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2011, 10:34 AM CST for 4 states. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Feb 24, 2011, 10:34 AM CST (16:34 UTC)
- Expired
- Feb 24, 2011, 11:30 AM CST
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 44 counties
Garland County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rusk 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), 143 km from the middle of the area, began a volume at 16:37 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, 4.6 hours before the alert went out and 148 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
- 36 J/kg
- Mixed-layer CIN
- -228 J/kg
- Mixed-layer LCL
- 741 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 282 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
943 ACUS11 KWNS 241634 SWOMCD SPC MCD 241634 ARZ000-LAZ000-TXZ000-OKZ000-241730- MESOSCALE DISCUSSION 0124 NWS STORM PREDICTION CENTER NORMAN OK 1034 AM CST THU FEB 24 2011 AREAS AFFECTED...PARTS OF ERN OK/TX...WRN AR AND NWRN LA CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY VALID 241634Z - 241730Z THUNDERSTORMS ARE GRADUALLY INCREASING IN BOTH AREAL COVERAGE AND INTENSITY WITHIN BROADER WARM CONVEYOR FROM THE I-35 CORRIDOR SOUTH OF THE DFW METROPLEX...NWD INTO OK. THIS ACTIVITY IS EVOLVING WITHIN A VERY STRONGLY SHEARED ENVIRONMENT THAT IS EXPECTED TO ONLY STRENGTHEN INTO THE AFTERNOON HOURS AS LLJ INCREASES IN RESPONSE TO DEEPENING CYCLONE. ALTHOUGH CONSIDERABLE CLOUDINESS IS OBSERVED ACROSS THE WARM SECTOR IT APPEARS LARGE SCALE ASCENT/COOLING WILL GRADUALLY STEEPEN LAPSE RATE ENVIRONMENT ENABLING NEAR-SFC BASED CONVECTION TO ROOT INTO MORE BUOYANT BOUNDARY LAYER PARCELS. SUPERCELLS AND POSSIBLE TORNADOES CAN BE EXPECTED...ESPECIALLY LATER THIS AFTERNOON AS CONVECTION SPREADS INTO THE LOWER MS VALLEY. ..DARROW.. 02/24/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...SHV...TSA...FWD...OUN... LAT...LON 32029634 35599561 35039295 31689387 32029634
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 24, 11:25 AM CST | Tornado Watch | SPC | Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 38 more | 9 hr |
| Feb 24, 2:12 PM CST | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Mississippi, Phillips, Poinsett and 1 more | 93 min |
| Feb 24, 2:34 PM CST | Tornado Watch | SPC | Arkansas, Ashley, Chicot, Clay, Craighead, Crittenden and 14 more | 7 hr |
| Feb 24, 2:39 PM CST | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 31 more | 66 min |
| Feb 24, 5:26 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 39 more | 94 min |
| Feb 23, 8:43 PM CST | Mesoscale Discussion | SPC | Craig, Nowata, Osage, Ottawa, Pawnee, Rogers and 1 more | 62 min |
| Feb 24, 3:07 AM CST | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 17 more | 113 min |
| Feb 24, 4:10 AM CST | Severe Thunderstorm Watch | SPC | Beckham, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more | 7 hr |
| Feb 24, 7:47 AM CST | Mesoscale Discussion | SPC | Cleveland, Cotton, Garvin, Grady, Jefferson, McClain and 3 more | 118 min |
Nearby
Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Oklahoma, 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.