Alert archive / Texas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 289
The Storm Prediction Center issued this severe thunderstorm watch at May 12, 2011, 9:02 AM CDT for 59 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 12, 2011, 9:02 AM CDT (14:02 UTC)
- Expired
- May 12, 2011, 3:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 59 counties
Anderson County, TX, Austin County, TX, Bastrop County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, Coryell County, TX, Dallas County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fayette County, TX, Fort Bend County, TX, Freestone County, TX, Galveston County, TX, Grimes County, TX, Hamilton County, TX, Harris County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Houston County, TX, Jackson County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Matagorda County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Navarro County, TX, Parker County, TX, Polk County, TX, Robertson County, TX, San Jacinto County, TX, Somervell County, TX, Tarrant County, TX, Travis County, TX, Trinity County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 18 km from the middle of the area, began a volume at 14:02 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 9:11 AM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Comal, Gillespie, Hays, Kendall and 3 more | 64 min |
| May 12, 9:17 AM CDT | Severe Thunderstorm Warning | HGX | Burleson | 43 min |
| May 12, 9:18 AM CDT | Severe Thunderstorm Warning | FWD | Bell, Coryell, Lampasas | 57 min |
| May 12, 9:26 AM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Lee, Travis, Williamson | 49 min |
| May 12, 9:46 AM CDT | Severe Thunderstorm Warning | EWX | Atascosa, Bexar, Blanco, Caldwell, Comal, Frio and 5 more | 59 min |
| May 12, 9:48 AM CDT | Severe Thunderstorm Warning | EWX | Fayette, Lee | 29 min |
| May 12, 10:15 AM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Caldwell, Hays, Lee, Travis, Williamson | 45 min |
| May 12, 10:24 AM CDT | Flash Flood Warning | EWX | Caldwell, Hays, Travis, Williamson | 3 hr |
| May 12, 10:37 AM CDT | Severe Thunderstorm Warning | EWX | Atascosa, Bastrop, Caldwell, DeWitt, Fayette, Gonzales and 4 more | 53 min |
| May 12, 10:58 AM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Caldwell, Fayette, Gonzales, Lavaca, Lee and 1 more | 47 min |
| May 12, 11:17 AM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 43 min |
| May 12, 11:28 AM CDT | Severe Thunderstorm Warning | EWX | Atascosa, Bastrop, Caldwell, DeWitt, Fayette, Gonzales and 3 more | 47 min |
| May 12, 11:32 AM CDT | Tornado Warning | EWX | Fayette, Gonzales, Lavaca | 28 min |
| May 12, 11:46 AM CDT | Severe Thunderstorm Warning | HGX | Austin, Burleson, Washington | 44 min |
| May 12, 11:56 AM CDT | Severe Thunderstorm Warning | HGX | Colorado | 49 min |
| May 12, 12:30 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Brazos, Burleson, Fort Bend, Grimes, Harris and 2 more | 45 min |
| May 12, 12:48 PM CDT | Severe Thunderstorm Warning | HGX | Colorado, Fort Bend, Wharton | 42 min |
| May 12, 1:37 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Brazoria, Fort Bend, Harris, Matagorda, Waller and 1 more | 53 min |
| May 12, 2:16 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Trinity, Walker | 3 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 2.0 hours before the alert went out and 251 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
- 1960 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 567 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 259 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 11.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:43 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Blanco, Bowie, Burnet, Camp and 20 more | 62 min |
| May 11, 11:25 PM CDT | Mesoscale Discussion | SPC | Austin, Bandera, Bastrop, Bexar, Brazos, Burleson and 27 more | 65 min |
| May 12, 2:57 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 25 more | 33 min |
| May 12, 3:18 AM CDT | Severe Thunderstorm Watch | SPC | Bandera, Dimmit, Edwards, Frio, Kerr, Kinney and 7 more | 5 hr |
| May 12, 7:27 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bee, Bexar, Brooks, Dimmit and 26 more | 33 min |
| May 12, 7:52 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Bandera, Bee, Bexar, Brooks and 33 more | 9 hr |
| May 12, 8:46 AM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Bosque, Brazos, Burleson, Caldwell and 22 more | 59 min |
| May 12, 11:43 AM CDT | Mesoscale Discussion | SPC | Anderson, Aransas, Austin, Bee, Brazos, Burleson and 33 more | 92 min |
| May 12, 1:46 PM CDT | Mesoscale Discussion | SPC | Fannin, Grayson, Lamar | 119 min |
| May 12, 3:17 PM CDT | Severe Thunderstorm Watch | SPC | Cooke, Fannin, Grayson, Lamar, Montague, Red River | 7 hr |
| May 12, 6:30 PM CDT | Mesoscale Discussion | SPC | Cooke, Fannin, Grayson, Lamar | 90 min |
Nearby
Severe Thunderstorm Watches in Texas, 2011Every severe thunderstorm watch 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.