Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 311
The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2011, 8:17 PM CDT for 64 counties in Texas. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Mar 29, 2011, 8:17 PM CDT (01:17 UTC)
- Expired
- Mar 29, 2011, 10:15 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 64 counties
Aransas County, TX, Atascosa County, TX, Austin County, TX, Bandera County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Brazoria County, TX, Caldwell County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Galveston County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Hays County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Jim Wells County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Kleberg County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Live Oak County, TX, Matagorda County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Montgomery County, TX, Nueces County, TX, Orange County, TX, Polk County, TX, Real County, TX, Refugio County, TX, San Jacinto County, TX, San Patricio County, TX, Travis County, TX, Tyler County, TX, Uvalde County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Webb County, TX, Wharton County, TX, Wilson County, TX, Zavala County, TX
The radar
The Corpus Christi radar (KCRP), 112 km from the middle of the area, began a volume at 01:21 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
Corpus Christi, TX (KCRP), launched 00:00Z, 1.3 hours before the alert went out and 114 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
- 2075 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 749 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.2
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 |
|---|---|---|---|---|
| Mar 29, 8:34 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 12 more | 7 hr |
| Mar 29, 10:15 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Austin, Bee, Bexar, Brazoria and 42 more | 90 min |
| Mar 29, 10:47 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Dimmit, Duval, Jim Hogg, La Salle, Webb and 1 more | 4 hr |
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.