Alert archive / Texas / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 769
The Storm Prediction Center issued this severe thunderstorm watch at Aug 20, 2004, 3:40 PM CDT for 26 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2004, 3:40 PM CDT (20:40 UTC)
- Expired
- Aug 20, 2004, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Bandera County, TX, Concho County, TX, Crane County, TX, Crockett County, TX, Ector County, TX, Edwards County, TX, Gillespie County, TX, Glasscock County, TX, Irion County, TX, Kerr County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Medina County, TX, Menard County, TX, Midland County, TX, Reagan County, TX, Real County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Uvalde County, TX, Val Verde County, TX
The radar
The San Angelo radar (KSJT), 74 km from the middle of the area, began a volume at 20:42 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.
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 |
|---|---|---|---|---|
| Aug 20, 3:50 PM CDT | Severe Thunderstorm Warning | SJT | Tom Green | 40 min |
| Aug 20, 4:28 PM CDT | Severe Thunderstorm Warning | SJT | Tom Green | 62 min |
| Aug 20, 5:29 PM CDT | Severe Thunderstorm Warning | SJT | Menard | 61 min |
| Aug 20, 5:34 PM CDT | Severe Thunderstorm Warning | SJT | Concho | 56 min |
| Aug 20, 6:18 PM CDT | Flash Flood Warning | SJT | Menard | 3 hr |
| Aug 20, 6:53 PM CDT | Flash Flood Warning | SJT | Tom Green | 3 hr |
| Aug 20, 7:21 PM CDT | Severe Thunderstorm Warning | SJT | Kimble, McCulloch, Mason | 54 min |
| Aug 20, 8:14 PM CDT | Flash Flood Warning | SJT | McCulloch | 3 hr |
| Aug 20, 9:58 PM CDT | Severe Thunderstorm Warning | SJT | Tom Green | 62 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
Midland Regional, TX (KMAF), launched 12:00Z, 8.7 hours before the alert went out and 147 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
- 1144 J/kg
- Mixed-layer CIN
- -162 J/kg
- Mixed-layer LCL
- 1023 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 199 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 1:27 AM CDT | Mesoscale Discussion | SPC | Borden, Cottle, Crosby, Dawson, Dickens, Fisher and 16 more | 93 min |
| Aug 20, 3:02 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 29 more | 2 hr |
| Aug 20, 6:25 PM CDT | Mesoscale Discussion | SPC | Bandera, Concho, Crane, Crockett, Ector, Edwards and 19 more | 95 min |
Nearby
Severe Thunderstorm Watches in Texas, 2004Every severe thunderstorm watch in 2004
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.