Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 521

April 30, 200417 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2004, 7:00 PM CDT for 17 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2004, 7:00 PM CDT (00:00 UTC)
Expired
Apr 30, 2004, 8:30 PM CDT
In force
90 min
Issued by
the Storm Prediction Center

Counties Bosque County, TX, Brown County, TX, Coleman County, TX, Comanche County, TX, Concho 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, San Saba County, TX, Somervell County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.0 hours before the alert went out and 205 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 2004-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2126 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 2004-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
2126 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1074 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
1.3
Supercell composite
6.8

Open this sounding in Storm Lab

The text

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

484 
ACUS11 KWNS 010001
SWOMCD
SPC MCD 010000 
TXZ000-010130-

MESOSCALE DISCUSSION 0521
NWS STORM PREDICTION CENTER NORMAN OK
0700 PM CDT FRI APR 30 2004

AREAS AFFECTED...CENTRAL TX

CONCERNING...SEVERE THUNDERSTORM WATCH 134...

VALID 010000Z - 010130Z

SEVERE THREAT CONTINUES -- PARTICULARLY ACROSS THE NRN HALF OF WW.

LATEST RADAR DATA INDICATES THAT STRONGEST STORM ACROSS WW IS MOVING
RAPIDLY EWD ACROSS BROWN COUNTY ATTM -- AND IS CAPABLE OF PRODUCING
LARGE HAIL AND STRONG WINDS.  THIS STORM CONTINUES TO EXHIBIT
SUPERCELL CHARACTERISTICS...ALTHOUGH NEW CONVECTION DEVELOPING JUST
SOUTH OF THIS STORM WILL LIKELY MERGE WITH AND POSSIBLY DISRUPT
STORM INTENSITY.

ELSEWHERE...CONVECTIVE DEVELOPMENT HAS BEEN SLOW TO OCCUR ACROSS SRN
PORTIONS OF WW DESPITE THE FACT THAT FRONT HAS NOW SURGED SWD AND IS
MOVING INTO SCHLEICHER AND NWRN MENARD COUNTIES.  THIS SUGGESTS THAT
CAP IS SOMEWHAT STRONGER ACROSS THIS REGION AND THAT STORM
DEVELOPMENT OVER SWRN PORTIONS OF WW MAY BE SUPPRESSED.  MOST LIKELY
AREA FOR NEW STORM DEVELOPMENT WILL LIKELY BE ACROSS
MCCULLOUGH...MILLS...AND SAN SABA COUNTIES OVER THE NEXT HOUR OR SO
WHERE INSTABILITY IS MAXIMIZED.

..GOSS.. 05/01/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FWD...EWX...SJT...

32099964 32349886 32419708 30649836 30660053

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 7:22 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Delta and 25 more83 min
Apr 30, 7:40 PM CDTSevere Thunderstorm WatchSPCAnderson, Bowie, Camp, Delta, Ellis, Fannin and 20 more5 hr
Apr 30, 8:14 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Denton, Grayson and 8 more91 min
Apr 30, 9:07 PM CDTMesoscale DiscussionSPCBosque, Brown, Comanche, Coryell, Erath, Hamilton and 8 more53 min
Apr 30, 9:54 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Delta, Ellis, Franklin and 19 more96 min
Apr 30, 10:34 PM CDTMesoscale DiscussionSPCBrown, Coleman, Concho, Crockett, Edwards, Irion and 15 more86 min
Apr 30, 11:35 PM CDTSevere Thunderstorm WatchSPCBlanco, Concho, Crockett, Edwards, Gillespie, Irion and 13 more5 hr
Apr 30, 11:56 PM CDTMesoscale DiscussionSPCChambers, Galveston, Grimes, Hardin, Harris, Jasper and 10 more94 min
May 1, 12:50 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 47 more6 hr
May 1, 1:34 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Comal, Concho and 24 more86 min
May 1, 1:49 AM CDTMesoscale DiscussionSPCAnderson, Bell, Cherokee, Falls, Freestone, Henderson and 5 more86 min
May 1, 2:38 AM CDTMesoscale DiscussionSPCAngelina, Sabine, San Augustine, Shelby37 min
May 1, 3:10 AM CDTSevere Thunderstorm WatchSPCAngelina, Sabine, San Augustine, Shelby6 hr
May 1, 3:28 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Concho, Crockett and 23 more92 min
May 1, 3:41 AM CDTMesoscale DiscussionSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 18 more64 min
May 1, 3:50 AM CDTTornado WatchSPCAngelina, Austin, Bastrop, Brazos, Burleson, Chambers and 25 more6 hr
May 1, 5:13 AM CDTMesoscale DiscussionSPCAnderson, Cherokee, Harrison, Nacogdoches, Panola, Rusk and 1 more92 min
May 1, 5:40 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bee, Bexar, Caldwell, DeWitt, Dimmit and 17 more6 hr
May 1, 6:08 AM CDTMesoscale DiscussionSPCAngelina, Austin, Brazos, Burleson, Chambers, Colorado and 24 more97 min
May 1, 7:24 AM CDTMesoscale DiscussionSPCSabine, San Augustine, Shelby96 min
May 1, 7:33 AM CDTMesoscale DiscussionSPCAtascosa, Bee, Bexar, Caldwell, DeWitt, Dimmit and 16 more87 min
May 1, 7:47 AM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Chambers, Colorado and 23 more88 min
May 1, 9:16 AM CDTMesoscale DiscussionSPCBrazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 3 more59 min
May 1, 9:36 AM CDTMesoscale DiscussionSPCNueces114 min
May 1, 9:45 AM CDTTornado WatchSPCBrazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 6 more5 hr
May 1, 9:55 AM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Kleberg and 3 more5 hr
May 1, 11:15 AM CDTMesoscale DiscussionSPCKenedy2 hr
May 1, 1:14 PM CDTMesoscale DiscussionSPCWillacy2 hr

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.