Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 2148

August 11, 200348 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2003, 6:09 PM CDT for 48 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Aug 11, 2003, 6:09 PM CDT (23:09 UTC)
Expired
Aug 11, 2003, 7:45 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 48 counties

Aransas County, TX, Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Blanco County, TX, Brooks County, TX, Caldwell County, TX, Cameron County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Fayette County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, Kendall County, TX, Kenedy County, TX, Kerr County, TX, Kinney County, TX, Kleberg County, TX, La Salle County, TX, Lavaca County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Nueces County, TX, Real County, TX, Refugio County, TX, San Patricio County, TX, Starr County, TX, Travis County, TX, Uvalde County, TX, Victoria County, TX, Webb County, TX, Willacy County, TX, Wilson County, TX, Zapata County, TX, Zavala County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 11.2 hours before the alert went out and 114 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, Corpus Christi, TX at 12:00Z on 2003-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1123 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, Corpus Christi, TX at 12:00Z on 2003-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 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
1123 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
798 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

970 
ACUS11 KWNS 112309
SWOMCD
SPC MCD 112309 
TXZ000-120045-

MESOSCALE DISCUSSION 2148
NWS STORM PREDICTION CENTER NORMAN OK
0609 PM CDT MON AUG 11 2003

AREAS AFFECTED...SOUTH TEXAS

CONCERNING...SEVERE THUNDERSTORM WATCH 857...

VALID 112309Z - 120045Z

SEVERAL SMALL CLUSTERS OF STRONG/SEVERE THUNDERSTORMS CONTINUE TO
MOVE SSW AT ABOUT 20 KTS IN PART OF S TX COVERED BY WW 857. 
DAMAGING WIND GUSTS HAVE ACCOMPANIED THE FAIRLY STRONG/COLD OUTFLOW
FROM SOME OF THE STORMS.

AIR MASS S OF MAIN COMPOSITE OUTFLOW BOUNDARY...WHICH RUNS ROUGHLY
W/E ACROSS SRN PART OF WW...SHOULD REMAIN CONDUCIVE TO LOCALIZED
STRONG DOWNDRAFT DEVELOPMENT DURING THE NEXT COUPLE OF HOURS. 
AND...A FEW NEW STORMS WILL PROBABLY INITIATE THROUGH SUNSET ALONG
SLOW-MOVING SEA BREEZE FRONT THAT ATTM EXTENDS S FROM WW INTO
HIDALGO COUNTY.  AN ISOLATED STRONG STORM OR TWO MAY ALSO DEVELOP IN
DEEP-MIXED ENVIRONMENT EXTENDING SW FROM WRN PART OF WW TO THE RIO
GRANDE.  THE OVERALL POTENTIAL FOR ADDITIONAL SEVERE ACTIVITY
APPEARS LIMITED ENOUGH...HOWEVER...TO NOT WARRANT A REPLACEMENT WW.

..CORFIDI.. 08/11/2003

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

ATTN...WFO...HGX...CRP...EWX...BRO...

25989716 26139830 26829928 28690035 29270063 30040023
30319865 30249661 28469666 27529740

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 11:31 AM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazoria, Brazos, Burleson, Caldwell and 27 more89 min
Aug 11, 12:05 PM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Colorado, Fort Bend, Galveston, Harris and 8 more6 hr
Aug 11, 2:06 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Cooke, Dallas and 31 more54 min
Aug 11, 2:31 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bee, Bexar and 44 more29 min
Aug 11, 2:35 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 21 more5 hr
Aug 11, 4:45 PM CDTSevere Thunderstorm WatchSPCBosque, Clay, Collin, Comanche, Cooke, Dallas and 17 more5 hr
Aug 11, 5:16 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Brazoria, Brazos, Chambers and 21 more59 min
Aug 11, 5:29 PM CDTMesoscale DiscussionSPCCollin, Dallas, Ellis, Grayson, Navarro, Rockwall2 hr

Nearby

Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

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.