Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 550
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2011, 1:13 PM CDT for 19 counties in Oklahoma; 43 counties in Texas. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2011, 1:13 PM CDT (18:13 UTC)
- Expired
- Apr 24, 2011, 2:45 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 62 counties
Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Stephens County, OK, Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Fannin County, TX, Fisher County, TX, Grayson County, TX, Haskell County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Knox County, TX, Lamar County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wise County, TX, Young County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 92 km from the middle of the area, began a volume at 18:13 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
Fort Worth, TX (KFWD), launched 12:00Z, 6.2 hours before the alert went out and 75 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
- 1821 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 577 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.6
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 7:04 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Jefferson and 9 more | 86 min |
| Apr 23, 9:08 PM CDT | Mesoscale Discussion | SPC | Adair, Canadian, Cherokee, Cleveland, Craig, Creek and 26 more | 97 min |
| Apr 23, 9:53 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Caddo, Canadian, Carter and 47 more | 7 hr |
| Apr 23, 10:40 PM CDT | Mesoscale Discussion | SPC | Adair | 95 min |
| Apr 24, 2:02 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Cherokee and 42 more | 88 min |
| Apr 24, 4:17 AM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Cherokee, Cleveland, Coal and 29 more | 28 min |
| Apr 24, 2:28 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 31 more | 7 hr |
| Apr 24, 5:34 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Choctaw, Coal, Haskell and 11 more | 26 min |
| Apr 24, 5:36 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Johnston and 7 more | 7 hr |
| Apr 24, 6:23 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Latimer, LeFlore, McCurtain and 2 more | 2 hr |
| Apr 24, 2:19 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 17 more | 3 hr |
| Apr 24, 4:51 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 19 more | 24 min |
| Apr 24, 4:54 PM CDT | Tornado Watch | SPC | Brown, Callahan, Coke, Coleman, Collin, Comanche and 33 more | 7 hr |
| Apr 24, 5:22 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Irion, Kinney, Maverick, Menard and 4 more | 83 min |
Nearby
Mesoscale Discussions in Texas, 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.