Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 459

April 23, 20048 counties in Oklahoma; 26 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2004, 9:18 PM CDT for 8 counties in Oklahoma; 26 counties in Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2004, 9:18 PM CDT (02:18 UTC)
Expired
Apr 23, 2004, 10:15 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 34 counties

Carter County, OK, Coal County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Stephens County, OK, Brown County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hood County, TX, Jack County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Tarrant County, TX, Taylor County, TX, Wise County, TX, Young County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.3 hours before the alert went out and 162 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 00:00Z on 2004-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1475 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 00:00Z on 2004-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 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
1475 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
895 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.5

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 23, 7:05 PM CDTMesoscale DiscussionSPCAdair, Alfalfa, Atoka, Blaine, Caddo, Canadian and 46 more25 min
Apr 23, 7:35 PM CDTSevere Thunderstorm WatchSPCAdair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 40 more6 hr
Apr 23, 7:48 PM CDTMesoscale DiscussionSPCCarter, Cotton, Jefferson, Johnston, Love, Marshall and 3 more87 min
Apr 23, 7:56 PM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Coal, Haskell, Johnston and 4 more2 hr
Apr 23, 9:43 PM CDTMesoscale DiscussionSPCAdair, Caddo, Canadian, Cherokee, Cleveland, Coal and 38 more62 min
Apr 23, 11:08 PM CDTMesoscale DiscussionSPCCarter, Johnston, Love, Marshall, Murray37 min
Apr 23, 11:33 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Haskell, Hughes, Latimer and 12 more57 min
Apr 24, 1:40 AM CDTSevere Thunderstorm WatchSPCLeFlore, McCurtain, Sequoyah4 hr
Apr 24, 12:28 AM CDTMesoscale DiscussionSPCAtascosa, Austin, Bastrop, Bee, Bexar, Burleson and 25 more92 min
Apr 24, 12:50 AM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Austin, Bastrop, Bee, Caldwell and 27 more5 hr
Apr 24, 3:00 AM CDTMesoscale DiscussionSPCAransas, Austin, Brazoria, Calhoun, Chambers, Colorado and 18 more60 min
Apr 24, 3:45 AM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Calhoun, Chambers, Colorado, Fayette and 21 more5 hr

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.