Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 1346
The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2011, 6:21 PM CDT for 12 counties in Arkansas; 4 counties in Oklahoma; 21 counties in Texas. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2011, 6:21 PM CDT (23:21 UTC)
- Expired
- Jun 21, 2011, 7:15 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 37 counties
Franklin County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Montgomery County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Yell County, AR, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX
The radar
The Western Arkansas radar (KSRX), 166 km from the middle of the area, began a volume at 23:21 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, 11.4 hours before the alert went out and 210 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 0 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.6
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 |
|---|---|---|---|---|
| Jun 20, 9:46 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 9 hr |
| Jun 21, 3:15 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Franklin, Madison and 2 more | 60 min |
| Jun 21, 6:43 PM CDT | Severe Thunderstorm Watch | SPC | Conway, Garland, Howard, Johnson, Little River, Logan and 10 more | 6 hr |
| Jun 20, 7:56 PM CDT | Mesoscale Discussion | SPC | Carter, Cleveland, Cotton, Creek, Garvin, Grady and 17 more | 94 min |
| Jun 21, 3:43 PM CDT | Mesoscale Discussion | SPC | Anderson, Bosque, Camp, Cass, Cherokee, Coryell and 32 more | 62 min |
| Jun 21, 4:58 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Angelina, Bell, Bosque, Brewster, Brown and 84 more | 10 hr |
| Jun 21, 6:59 PM CDT | Mesoscale Discussion | SPC | Angelina, Cherokee, Hardin, Houston, Jasper, Liberty and 10 more | 61 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.