Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 512

April 30, 200415 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2004, 12:01 PM CDT for 15 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2004, 12:01 PM CDT (17:01 UTC)
Expired
Apr 30, 2004, 2:00 PM CDT
In force
119 min
Issued by
the Storm Prediction Center

Counties Archer County, TX, Baylor County, TX, Eastland County, TX, Erath County, TX, Haskell County, TX, Hood County, TX, Jack County, TX, Jones County, TX, Palo Pinto County, TX, Parker County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 5.0 hours before the alert went out and 195 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 Sill, OK at 12:00Z on 2004-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Sill, OK at 12:00Z on 2004-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 227 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1426 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
227 m²/s²
0-3 km storm-relative helicity
372 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 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, 12:45 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, 5:05 PM CDTSevere Thunderstorm WatchSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 16 more5 hr
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

Mesoscale Discussions in Texas, 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.