Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 694

May 13, 200420 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 13, 2004, 5:54 PM CDT for 20 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 13, 2004, 5:54 PM CDT (22:54 UTC)
Expired: May 13, 2004, 7:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center

Counties Brown County, TX, Callahan County, TX, Coleman County, TX, Concho County, TX, Eastland County, TX, Haskell County, TX, Jones County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Young County, TX

The radar

The San Angelo radar (KSJT), 61 km from the middle of the area, began a volume at 22:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

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

Severe Thunderstorm Watch 203May 13, 6:55 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 10.9 hours before the alert went out and 218 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2743 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

008 
ACUS11 KWNS 132254
SWOMCD
SPC MCD 132254 
TXZ000-140030-

MESOSCALE DISCUSSION 0694
NWS STORM PREDICTION CENTER NORMAN OK
0554 PM CDT THU MAY 13 2004

AREAS AFFECTED...CNTRL TX

CONCERNING...TORNADO WATCH 200...

VALID 132254Z - 140030Z

KSJT RADAR SHOWS A COLD FRONT...OUTFLOW...DRYLINE INTERSECTION
MOVING SWD JUST NE OF KSJT.  CONVERGENCE VCNTY THIS TRIPLE POINT HAS
BEEN FORCING PARCELS TO CONVECT AND FEEDING SWRN PORTION OF A LINE
OF TSTMS ACROSS NRN PARTS OF WT 200.  THESE TSTMS APPEAR TO BE
SLIGHTLY ELEVATED AND WILL BECOME INCREASINGLY SO AS THEY MOVE EWD
INTO NCNTRL TX.

MEANWHILE...TSTMS CONTINUE TO DEVELOP EAST OF THE WESTWARD MOVING
OUTFLOW BOUNDARY...WITH THE STRONGEST STORM OVER MASON COUNTY. 
WEDGE OF VERY UNSTABLE AIR SEEMS TO BE FEEDING THIS STORM FROM THE
KJCT AREA.  

THE TORNADO THREAT IS LIKELY LIMITED ATTM...THOUGH AIR MASS ACROSS
PORTIONS OF KIMBLE COUNTY SEEMINGLY REMAINS IN THE WARM SECTOR.
GIVEN DEEP LAYER SHEAR OF 35-40 KTS...THREAT OF ORGANIZED TSTMS WITH
LARGE HAIL AND PERHAPS DAMAGING WINDS WILL EXIST...MAINLY ACROSS SRN
PARTS OF THE WW THROUGH 00 UTC.

WT 200 IS SET TO EXPIRE AT 00 UTC.  BY THAT TIME...IT APPEARS THE
SEVERE THREAT WILL BE TRANSLATING INTO SOUTH TX WHERE THE AIR MASS
REMAINS VERY UNSTABLE. WHILE WW/S MAY BE REORIENTED ACROSS THE
SOUTH PARTS OF CURRENT WW AND POINTS SWD...NRN HALF OF WW WILL NOT
BE REISSUED.

..RACY.. 05/13/2004

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

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

30490098 33380004 33349834 30479929

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 12, 8:04 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Fisher, Foard, Hardeman and 13 more	86 min
May 13, 3:52 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bastrop, Brazos, Burleson and 27 more	83 min
May 13, 8:30 AM CDT	Tornado Watch	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more	6 hr
May 13, 9:54 AM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more	96 min
May 13, 10:20 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Cottle, Dickens, Foard and 10 more	115 min
May 13, 10:45 AM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	6 hr
May 13, 12:10 PM CDT	Tornado Watch	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fayette and 22 more	6 hr
May 13, 12:26 PM CDT	Mesoscale Discussion	SPC	Bandera, Brown, Callahan, Coke, Coleman, Concho and 26 more	2 hr
May 13, 12:48 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Haskell, Knox and 4 more	117 min
May 13, 12:55 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	6 hr
May 13, 1:38 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 15 more	97 min
May 13, 2:30 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more	6 hr
May 13, 2:48 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Haskell, Wichita	87 min
May 13, 2:57 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	2 hr
May 13, 3:34 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more	86 min
May 13, 5:22 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 17 more	53 min
May 13, 6:55 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Mason and 6 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2004 Every 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; radar from the NEXRAD Level II archive.