Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 279

April 6, 20044 counties in Oklahoma; 28 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2004, 2:19 PM CDT for 4 counties in Oklahoma; 28 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Apr 6, 2004, 2:19 PM CDT (19:19 UTC)
Expired
Apr 6, 2004, 4:15 PM CDT
In force
116 min
Issued by
the Storm Prediction Center
All 32 counties

Cotton County, OK, Jackson County, OK, Jefferson County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Jack County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Motley County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 122 km from the middle of the area, began a volume at 19:18 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.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.3 hours before the alert went out and 264 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, Fort Worth, TX at 12:00Z on 2004-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 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, Fort Worth, TX at 12:00Z on 2004-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.193958Sfc1 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
158 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
484 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
-111 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 5, 10:35 PM CDTSevere Thunderstorm WatchSPCBandera, Bexar, Blanco, Comal, Frio, Gillespie and 13 more6 hr
Apr 5, 11:55 PM CDTMesoscale DiscussionSPCBandera, Blanco, Gillespie, Kendall, Kerr, Llano and 5 more2 hr
Apr 6, 2:42 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Burnet, Comal, Dimmit and 12 more63 min
Apr 6, 7:39 AM CDTMesoscale DiscussionSPCAtascosa, Austin, Bee, Brazoria, Colorado, DeWitt and 14 more66 min
Apr 6, 7:55 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Brazos, Burleson and 20 more5 hr
Apr 6, 9:29 AM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Brazos, Burleson and 20 more91 min
Apr 6, 10:27 AM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 3 more63 min
Apr 6, 11:05 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 20 more5 hr
Apr 6, 12:52 PM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 22 more83 min
Apr 6, 2:43 PM CDTMesoscale DiscussionSPCAransas, Bee, Calhoun, DeWitt, Galveston, Goliad and 9 more62 min

Nearby

Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Oklahoma, 2004Every mesoscale discussion 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.