Alert archive / Texas / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 202
The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2007, 1:26 PM CDT for 16 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2007, 1:26 PM CDT (18:26 UTC)
- Expired
- Apr 30, 2007, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Austin County, TX, Brazoria County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Goliad County, TX, Gonzales County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Matagorda County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Austin/San Antonio radar (KEWX), 130 km from the middle of the area, began a volume at 18:27 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
- 30%
- One or more gusts of 65 knots or more
- 20%
- 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
- 50%
Warnings issued inside it
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 1:26 PM CDT | Severe Thunderstorm Warning | EWX | Fayette | 79 min |
| Apr 30, 1:32 PM CDT | Flash Flood Warning | EWX | Karnes | 118 min |
| Apr 30, 2:04 PM CDT | Severe Thunderstorm Warning | HGX | Washington | 56 min |
| Apr 30, 2:06 PM CDT | Severe Thunderstorm Warning | EWX | Karnes | 54 min |
| Apr 30, 2:16 PM CDT | Tornado Warning | HGX | Colorado | 44 min |
| Apr 30, 2:22 PM CDT | Flash Flood Warning | EWX | Gonzales | 113 min |
| Apr 30, 2:23 PM CDT | Tornado Warning | HGX | Washington | 37 min |
| Apr 30, 2:55 PM CDT | Flash Flood Warning | EWX | DeWitt | 2 hr |
| Apr 30, 2:58 PM CDT | Severe Thunderstorm Warning | HGX | Colorado | 32 min |
| Apr 30, 3:00 PM CDT | Flash Flood Warning | EWX | Fayette, Lavaca | 2 hr |
| Apr 30, 3:12 PM CDT | Flash Flood Warning | EWX | Karnes | 2 hr |
| Apr 30, 3:19 PM CDT | Severe Thunderstorm Warning | EWX | Gonzales | 56 min |
| Apr 30, 4:34 PM CDT | Flash Flood Warning | HGX | Austin, Colorado | 71 min |
| Apr 30, 4:59 PM CDT | Flash Flood Warning | EWX | DeWitt, Lavaca | 3 hr |
| Apr 30, 5:31 PM CDT | Flash Flood Warning | EWX | Karnes | 2 hr |
| Apr 30, 6:30 PM CDT | Severe Thunderstorm Warning | EWX | DeWitt | 45 min |
| Apr 30, 6:58 PM CDT | Severe Thunderstorm Warning | EWX | Lavaca | 47 min |
| Apr 30, 7:14 PM CDT | Severe Thunderstorm Warning | EWX | DeWitt | 16 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
Corpus Christi, TX (KCRP), launched 12:00Z, 6.4 hours before the alert went out and 216 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
- 2122 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 471 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 7:25 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Crockett, Culberson, Jeff Davis, Loving and 11 more | 65 min |
| Apr 29, 7:48 PM CDT | Tornado Watch | SPC | Bandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more | 7 hr |
| Apr 29, 8:35 PM CDT | Mesoscale Discussion | SPC | Baylor, Callahan, Coke, Coleman, Concho, Ector and 24 more | 115 min |
| Apr 29, 10:42 PM CDT | Mesoscale Discussion | SPC | Bandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more | 63 min |
| Apr 30, 2:10 AM CDT | Mesoscale Discussion | SPC | Bandera, Crockett, Dimmit, Edwards, Frio, Kerr and 12 more | 95 min |
| Apr 30, 2:47 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 10 more | 3 hr |
| Apr 30, 2:51 AM CDT | Severe Thunderstorm Watch | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more | 5 hr |
| Apr 30, 4:46 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more | 119 min |
| Apr 30, 12:37 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bee, Caldwell, DeWitt, Dimmit and 15 more | 83 min |
| Apr 30, 1:22 PM CDT | Mesoscale Discussion | SPC | Camp, Collin, Dallas, Delta, Fannin, Franklin and 14 more | 113 min |
| Apr 30, 3:01 PM CDT | Tornado Watch | SPC | Dimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more | 7 hr |
| Apr 30, 3:23 PM CDT | Mesoscale Discussion | SPC | Grimes, Harris, Houston, Leon, Liberty, Madison and 4 more | 97 min |
| Apr 30, 5:38 PM CDT | Mesoscale Discussion | SPC | Archer, Armstrong, Baylor, Borden, Briscoe, Callahan and 42 more | 2 hr |
| Apr 30, 6:18 PM CDT | Mesoscale Discussion | SPC | Dimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more | 57 min |
| Apr 30, 6:37 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more | 83 min |
Nearby
Severe Thunderstorm Watches in Texas, 2007Every severe thunderstorm watch in 2007
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.