Alert archive / Texas / Tornado Watches in 2010
Tornado Watch 646
The Storm Prediction Center issued this tornado watch at Sep 7, 2010, 4:37 AM CDT for 25 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2010, 4:37 AM CDT (09:37 UTC)
- Expired
- Sep 7, 2010, 1:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 25 counties
Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Goliad County, TX, Gonzales County, TX, Jackson County, TX, Jim Wells County, TX, Karnes County, TX, Kleberg County, TX, Lavaca County, TX, Live Oak County, TX, Matagorda County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Corpus Christi radar (KCRP), 104 km from the middle of the area, began a volume at 09:38 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 30%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 5:34 AM CDT | Flash Flood Warning | CRP | Aransas, Refugio | 116 min |
| Sep 7, 6:32 AM CDT | Flash Flood Warning | CRP | Calhoun, Victoria | 88 min |
| Sep 7, 8:25 AM CDT | Flash Flood Warning | CRP | Calhoun, Victoria | 80 min |
| Sep 7, 8:55 AM CDT | Flash Flood Warning | HGX | Colorado, Jackson, Matagorda, Wharton | 3 hr |
| Sep 7, 9:28 AM CDT | Tornado Warning | HGX | Fort Bend, Waller | 32 min |
| Sep 7, 10:00 AM CDT | Tornado Warning | HGX | Waller, Washington | 30 min |
| Sep 7, 11:22 AM CDT | Flash Flood Warning | EWX | Atascosa, Bandera, Bexar, Comal, Guadalupe, Karnes and 2 more | 3 hr |
| Sep 7, 11:52 AM CDT | Severe Thunderstorm Warning | HGX | Matagorda | 24 min |
| Sep 7, 11:58 AM CDT | Flash Flood Warning | HGX | Colorado, Jackson, Matagorda, Wharton | 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
Corpus Christi, TX (KCRP), launched 00:00Z, 9.6 hours before the alert went out and 106 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
- 1455 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 760 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 72 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, 11:41 AM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brazoria, Calhoun, Fort Bend, Goliad and 8 more | 94 min |
| Sep 7, 12:12 PM CDT | Tornado Watch | SPC | Anderson, Austin, Bosque, Brazoria, Brazos, Burleson and 45 more | 8 hr |
| 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; radar from the NEXRAD Level II archive.