Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 710

April 29, 200521 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2005, 4:10 PM CDT for 21 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2005, 4:10 PM CDT (21:10 UTC)
Expired
Apr 29, 2005, 6:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 21 counties

Anderson County, TX, Bastrop County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Cherokee County, TX, Comal County, TX, Fayette County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Madison County, TX, Milam County, TX, Robertson County, TX, Travis County, TX, Trinity County, TX, Walker County, TX, Washington County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.2 hours before the alert went out and 252 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 2005-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1015 joules per kilogram.LCLLFCEL10008507005003002001001 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 Worth, TX at 12:00Z on 2005-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 square meters per square second.1939587897Sfc1 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
1015 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
605 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
207 m²/s²
0-3 km storm-relative helicity
227 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 292111
SWOMCD
SPC MCD 292110 
TXZ000-292315-

MESOSCALE DISCUSSION 0710
NWS STORM PREDICTION CENTER NORMAN OK
0410 PM CDT FRI APR 29 2005

AREAS AFFECTED...ERN INTO SCNTRL TX

CONCERNING...CONVECTIVE TRENDS 

VALID 292110Z - 292315Z

WILL CONTINUE TO MONITOR VIS SATELLITE TRENDS ACROSS ERN INTO SCNTRL
TX...A CONDITIONAL THREAT FOR ISOLD SEVERE HAIL/WIND WOULD EXIST
LATE THIS AFTERNOON GIVEN INITIATION.

CU FIELD CONTINUES TO DEEPEN ALONG COLD FRONT IN ERN TX...WITH THE
RELATIVELY MORE AGGRESSIVE CU FIELD OCCURRING NEAR THERMAL
LOW/DRYLINE/COLD FRONT INTERSECTION IN SCNTRL TX NEAR TPL/AUS. GIVEN
STRONG ELEVATED WARM LAYER /EVIDENT IN 12Z RAOBS/ ON SRN PERIPHERY
OF MID LEVEL JET...ISOLD TSTM INITIATION STILL REMAINS UNCERTAIN.
NEVERTHELESS...AS SEEN IN 18Z RUC POINT SOUNDINGS...FRONTAL FORCING
COMBINED WITH WELL MIXED AIRMASS /ON PERIPHERY OF 90F SFC TEMPS IN
SCNTRL TX/ MAY PROMOTE A FEW ISOLD STORMS REMAINDER OF THE
AFTERNOON...WITH ATTENDANT ISOLD SEVERE THREAT.

..GUYER.. 04/29/2005

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

ATTN...WFO...SHV...HGX...FWD...EWX...

29919672 29459820 29739839 30779742 31559609 32409534
31859464 30929524 30199614

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 2:28 PM CDTMesoscale DiscussionSPCBowie, Cass107 min
Apr 29, 3:35 PM CDTTornado WatchSPCCass, Marion7 hr
Apr 29, 6:29 PM CDTMesoscale DiscussionSPCHarrison, Marion, Panola, Sabine, San Augustine, Shelby91 min

Nearby

Mesoscale Discussions in Texas, 2005Every mesoscale discussion in 2005

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.