Alert archive / Texas / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 134

April 30, 200422 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2004, 5:05 PM CDT for 22 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2004, 5:05 PM CDT (22:05 UTC)
Expired
Apr 30, 2004, 10:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 22 counties

Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Johnson County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Somervell County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 100 km from the middle of the area, began a volume at 22:08 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

18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 30, 5:26 PM CDTSevere Thunderstorm WarningFWDEastland, Erath49 min
Apr 30, 5:43 PM CDTTornado WarningSJTColeman62 min
Apr 30, 5:59 PM CDTSevere Thunderstorm WarningFWDErath, Palo Pinto, Parker46 min
Apr 30, 6:22 PM CDTTornado WarningSJTBrown53 min
Apr 30, 6:41 PM CDTSevere Thunderstorm WarningFWDErath, Hood, Parker64 min
Apr 30, 7:06 PM CDTSevere Thunderstorm WarningFWDComanche54 min
Apr 30, 7:08 PM CDTTornado WarningSJTBrown37 min
Apr 30, 7:22 PM CDTSevere Thunderstorm WarningFWDJohnson, Tarrant53 min
Apr 30, 7:43 PM CDTSevere Thunderstorm WarningFWDBosque, Erath, Hood, Somervell62 min
Apr 30, 7:47 PM CDTSevere Thunderstorm WarningSJTBrown43 min
Apr 30, 7:58 PM CDTSevere Thunderstorm WarningFWDComanche62 min
Apr 30, 8:07 PM CDTSevere Thunderstorm WarningFWDMills53 min
Apr 30, 8:16 PM CDTSevere Thunderstorm WarningFWDJohnson, Tarrant44 min
Apr 30, 8:29 PM CDTSevere Thunderstorm WarningFWDHamilton46 min
Apr 30, 8:42 PM CDTSevere Thunderstorm WarningFWDBosque, Hood, Somervell48 min
Apr 30, 8:57 PM CDTSevere Thunderstorm WarningFWDComanche, Dallas, Hamilton, Tarrant63 min
Apr 30, 9:12 PM CDTSevere Thunderstorm WarningFWDJohnson63 min
Apr 30, 9:24 PM CDTSevere Thunderstorm WarningFWDBosque66 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, 10.1 hours before the alert went out and 270 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.

Skew-T log-pSkew-T log-p diagram, Midland Regional, TX at 12:00Z on 2004-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 627 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Midland Regional, TX at 12:00Z on 2004-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
627 J/kg
Mixed-layer CIN
-191 J/kg
Mixed-layer LCL
1710 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 8:56 PM CDTMesoscale DiscussionSPCCottle, Crosby, Dickens, Foard, Garza, Hardeman and 4 more64 min
Apr 29, 9:28 PM CDTMesoscale DiscussionSPCCooke, Delta, Denton, Fannin, Grayson, Jack and 3 more62 min
Apr 29, 10:27 PM CDTMesoscale DiscussionSPCBaylor, Childress, Clay, Collingsworth, Cottle, Foard and 5 more63 min
Apr 29, 11:05 PM CDTSevere Thunderstorm WatchSPCCooke, Montague4 hr
Apr 30, 2:16 AM CDTMesoscale DiscussionSPCClay, Cooke, Hardeman, Montague, Wichita, Wilbarger59 min
Apr 30, 12:01 PM CDTMesoscale DiscussionSPCArcher, Baylor, Eastland, Erath, Haskell, Hood and 9 more119 min
Apr 30, 12:45 PM CDTTornado WatchSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 14 more8 hr
Apr 30, 2:40 PM CDTMesoscale DiscussionSPCCooke, Denton, Eastland, Erath, Hood, Jack and 6 more2 hr
Apr 30, 4:41 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 12 more94 min
Apr 30, 5:53 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 12 more97 min
Apr 30, 6:08 PM CDTMesoscale DiscussionSPCBailey, Borden, Cochran, Dawson, Gaines, Hockley and 6 more97 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.