Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 339
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 3:00 AM CDT for 26 counties in Arkansas; Choctaw County, McCurtain County, Pushmataha County, Oklahoma; 48 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2011, 3:00 AM CDT (08:00 UTC)
- Expired
- Apr 4, 2011, 5:30 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 77 counties
Clark 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, Jefferson County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada 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, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Bosque County, TX, Bowie County, TX, Brown County, TX, Callahan County, TX, Camp County, TX, Cass County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, McLennan County, TX, Mills 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, Runnels County, TX, Smith County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 118 km from the middle of the area, began a volume at 08:02 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 00:00Z, 8.0 hours before the alert went out and 107 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
- 1169 J/kg
- Mixed-layer CIN
- -459 J/kg
- Mixed-layer LCL
- 1778 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 297 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 3, 9:51 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Madison, Washington | 84 min |
| Apr 4, 1:29 AM CDT | Mesoscale Discussion | SPC | Benton, Carroll | 91 min |
| Apr 4, 3:44 AM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 37 more | 7 hr |
| Apr 4, 5:48 AM CDT | Mesoscale Discussion | SPC | Baxter, Clark, Clay, Cleburne, Conway, Craighead and 41 more | 117 min |
| Apr 4, 7:22 AM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 42 more | 7 hr |
| Apr 4, 7:44 AM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more | 8 hr |
| Apr 4, 10:25 AM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Apr 4, 10:53 AM CDT | Tornado Watch | SPC | Ashley, Chicot | 7 hr |
| Apr 3, 8:15 PM CDT | Mesoscale Discussion | SPC | Nowata, Washington | 60 min |
| Apr 4, 11:20 AM CDT | Mesoscale Discussion | SPC | Angelina, Chambers, Hardin, Harris, Jasper, Jefferson and 11 more | 115 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.