Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 406
The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2011, 1:27 AM CDT for 42 counties in Texas. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2011, 1:27 AM CDT (06:27 UTC)
- Expired
- Apr 11, 2011, 3:00 AM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 42 counties
Anderson County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Collin County, TX, Comanche County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Freestone County, TX, Gillespie County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McLennan County, TX, Mills County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, San Saba County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Williamson County, TX, Wood County, TX
The radar
The Ft Hood radar (KGRK), 95 km from the middle of the area, began a volume at 06:31 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, 6.5 hours before the alert went out and 151 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
- 637 J/kg
- Mixed-layer CIN
- -268 J/kg
- Mixed-layer LCL
- 1994 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 10, 7:02 PM CDT | Severe Thunderstorm Watch | SPC | Bosque, Brown, Callahan, Coleman, Collin, Comanche and 41 more | 8 hr |
| Apr 10, 9:09 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Cooke and 21 more | 66 min |
| Apr 10, 11:39 PM CDT | Tornado Watch | SPC | Anderson, Bandera, Bell, Blanco, Bosque, Burnet and 28 more | 7 hr |
| Apr 11, 1:49 AM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Delta, Franklin, Gregg and 14 more | 4 hr |
| Apr 11, 4:19 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 7 more | 56 min |
Nearby
Mesoscale Discussions in Texas, 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.