Alert archive / Texas / Tornado Watches in 2010
Tornado Watch 647
The Storm Prediction Center issued this tornado watch at Sep 7, 2010, 12:12 PM CDT for 51 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2010, 12:12 PM CDT (17:12 UTC)
- Expired
- Sep 7, 2010, 8:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 51 counties
Anderson County, TX, Austin County, TX, Bosque County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Collin County, TX, Colorado County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fort Bend County, TX, Freestone County, TX, Galveston County, TX, Grimes County, TX, Harris County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Jackson County, TX, Johnson County, TX, Kaufman County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Matagorda County, TX, McLennan County, TX, Montgomery County, TX, Navarro County, TX, Parker County, TX, Polk County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, San Jacinto County, TX, Somervell County, TX, Tarrant County, TX, Trinity County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wise County, TX
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 30%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 5%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 20%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 12:38 PM CDT | Flash Flood Warning | HGX | Harris | 3 hr |
| Sep 7, 1:32 PM CDT | Severe Thunderstorm Warning | HGX | Liberty, Montgomery, San Jacinto, Walker | 43 min |
| Sep 7, 1:53 PM CDT | Flash Flood Warning | HGX | Colorado, Jackson, Matagorda, Wharton | 112 min |
| Sep 7, 2:51 PM CDT | Tornado Warning | FWD | Johnson, Tarrant | 24 min |
| Sep 7, 3:24 PM CDT | Tornado Warning | FWD | Collin | 36 min |
| Sep 7, 3:46 PM CDT | Flash Flood Warning | HGX | Brazoria, Fort Bend, Matagorda, Wharton | 59 min |
| Sep 7, 4:18 PM CDT | Tornado Warning | FWD | Wise | 27 min |
| Sep 7, 4:57 PM CDT | Flash Flood Warning | FWD | Delta, Lamar | 2 hr |
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, 5.2 hours before the alert went out and 234 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
- 1740 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 531 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 8:06 PM CDT | Tornado Watch | SPC | Aransas, Bee, Brooks, Calhoun, Cameron, Goliad and 10 more | 9 hr |
| Sep 6, 10:13 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Hidalgo, Kenedy, Willacy | 3 hr |
| Sep 6, 11:50 PM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brooks, Calhoun, Cameron, Goliad and 10 more | 115 min |
| Sep 7, 3:38 AM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brazoria, Calhoun, Fort Bend, Goliad and 8 more | 97 min |
| Sep 7, 4:37 AM CDT | Tornado Watch | SPC | Aransas, Austin, Bee, Brazoria, Calhoun, Colorado and 19 more | 8 hr |
| Sep 7, 11:41 AM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brazoria, Calhoun, Fort Bend, Goliad and 8 more | 94 min |
| Sep 7, 6:00 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Bastrop, Bell, Bosque and 78 more | 2 hr |
| Sep 7, 6:37 PM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Brown, Burnet, Callahan, Coleman and 20 more | 3 hr |
Nearby
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.