Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 401

April 6, 200333 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 4:50 AM CDT for 33 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2003, 4:50 AM CDT (09:50 UTC)
Expired: Apr 6, 2003, 6:45 AM CDT
In force: 115 min
Issued by: the Storm Prediction Center

All 33 counties

Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Eastland County, TX, Edwards County, TX, Fisher County, TX, Foard County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, Kimble County, TX, Knox County, TX, McCulloch County, TX, Menard County, TX, Nolan County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Stonewall County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The watches that followed

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

Severe Thunderstorm Watch 98Apr 6, 5:35 AM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 9.8 hours before the alert went out and 179 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 4479 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 48 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.

434 
ACUS11 KWNS 060950
SWOMCD
SPC MCD 060950 
TXZ000-OKZ000-061145-

MESOSCALE DISCUSSION 0401
NWS STORM PREDICTION CENTER NORMAN OK
0450 AM CDT SUN APR 06 2003

AREAS AFFECTED...NWRN INTO W-CNTRL TX

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 060950Z - 061145Z

TSTM DEVELOPMENT IS EXPECTED ALONG THE DRYLINE OVER THE NEXT 1 TO
HOURS FROM NWRN TX SWD INTO W-CNTRL TX. A WW MAY BE REQUIRED.



LATEST MESOANALYSIS AND IR SATELLITE IMAGERY INDICATE THAT THE
DRYLINE HAS STARTED TO PUSH EWD AND CURRENTLY EXTENDS FROM A LOW
OVER THE LOW ROLLING PLAINS ENE OF LBB SWD TO W OF SJT. RECENT
SJT RADAR IMAGERY SHOWS CONVECTION TRYING TO INITIATE FROM
RUNNELS COUNTY SWWD INTO CROCKET COUNTY. 10Z RUC POINT FORECAST
SOUNDING FOR THE SJT VICINITY INDICATES A FAVORABLE ENVIRONMENT
FOR SEVERE THUNDERSTORMS WITH A MLCAPE OF AROUND 1500 J/KG AND A
LONG LOOPING HODOGRAPH /0-1 KM SRH AROUND 500 M2/S2...0-6 KM
SHEAR OF 50 KTS/. ALTHOUGH FORCING FOR LARGE SCALE ASCENT WILL
REMAIN N OF THE AREA...STRENGTHENING CONVERGENCE ALONG THE
DRYLINE MAY BE SUFFICIENT TO INITIATE CONVECTION.



IF TSTMS CAN DEVELOP A WW WILL LIKELY BE REQUIRED.

..MEAD.. 04/06/2003

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

ATTN...WFO...FWD...OUN...EWX...SJT...LUB...MAF...

30990152 32040102 32970053 33860005 34389917 33719828
31669897 29800013 30050188

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 5, 6:11 PM CST	Mesoscale Discussion	SPC	Baylor, Briscoe, Cottle, Crosby, Dickens, Floyd and 9 more	64 min
Apr 5, 6:35 PM CST	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Delta and 23 more	115 min
Apr 5, 6:40 PM CST	Tornado Watch	SPC	Briscoe, Childress, Cottle, Crosby, Dickens, Fisher and 16 more	5 hr
Apr 5, 8:04 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Collin, Cooke, Dallas and 25 more	116 min
Apr 5, 9:20 PM CST	Mesoscale Discussion	SPC	Archer, Camp, Clay, Collin, Cooke, Dallas and 31 more	55 min
Apr 5, 9:35 PM CST	Tornado Watch	SPC	Archer, Bowie, Camp, Cass, Clay, Collin and 38 more	5 hr
Apr 5, 10:26 PM CST	Mesoscale Discussion	SPC	Baylor, Childress, Cottle, Dickens, Fisher, Foard and 11 more	64 min
Apr 5, 11:43 PM CST	Mesoscale Discussion	SPC	Archer, Camp, Clay, Collin, Cooke, Dallas and 31 more	92 min
Apr 6, 3:13 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Camp, Cass, Cherokee, Clay and 39 more	107 min
Apr 6, 3:39 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Camp, Cass, Cherokee, Clay and 39 more	66 min
Apr 6, 5:35 AM CDT	Severe Thunderstorm Watch	SPC	Wichita	4 hr
Apr 6, 9:12 AM CDT	Mesoscale Discussion	SPC	Anderson, Bosque, Camp, Cass, Cherokee, Collin and 41 more	2 hr
Apr 6, 10:20 AM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Harrison, Marion, Morris, Panola	55 min
Apr 6, 10:30 AM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 14 more	6 hr
Apr 6, 12:03 PM CDT	Mesoscale Discussion	SPC	Gregg, Harrison, Marion, Panola, Rusk	117 min
Apr 6, 12:40 PM CDT	Tornado Watch	SPC	Anderson, Brazos, Burleson, Cherokee, Collin, Cooke and 33 more	5 hr
Apr 6, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Delta, Lamar, Red River	5 hr
Apr 6, 3:00 PM CDT	Mesoscale Discussion	SPC	Anderson, Brazos, Cherokee, Delta, Freestone, Grimes and 21 more	90 min
Apr 6, 3:26 PM CDT	Mesoscale Discussion	SPC	Angelina, Nacogdoches, Sabine, San Augustine, Shelby	2 hr
Apr 6, 3:45 PM CDT	Tornado Watch	SPC	Angelina, Gregg, Hardin, Harrison, Jasper, Liberty and 9 more	5 hr
Apr 6, 5:35 PM CDT	Mesoscale Discussion	SPC	Angelina, Gregg, Hardin, Harrison, Jasper, Liberty and 10 more	115 min
Apr 6, 6:23 PM CDT	Mesoscale Discussion	SPC	Newton, Sabine	97 min

Nearby

Mesoscale Discussions in Texas, 2003 Every 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.