Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 2439

November 23, 200426 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 2:14 PM CST for 26 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Nov 23, 2004, 2:14 PM CST (20:14 UTC)
Expired: Nov 23, 2004, 4:45 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center

All 26 counties

Briscoe County, TX, Childress County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Hockley County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Motley County, TX, Scurry County, TX, Stonewall County, TX, Swisher County, TX, Terry County, TX

The radar

The Lubbock radar (KLBB), 66 km from the middle of the area, began a volume at 20:15 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 nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.2 hours before the alert went out and 162 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: 1028 m above ground
0-6 km bulk shear: 98 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 75 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.

750 
ACUS11 KWNS 232015
SWOMCD
SPC MCD 232014 
TXZ000-OKZ000-232245-

MESOSCALE DISCUSSION 2439
NWS STORM PREDICTION CENTER NORMAN OK
0214 PM CST TUE NOV 23 2004

AREAS AFFECTED...SOUTH PLAINS OF NW TX

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 232014Z - 232245Z

THREAT FOR ISOLD/MARGINALLY SEVERE HAIL MAY EXIST THIS AFTERNOON IN
ASSOCIATION WITH UPPER LOW TRANSITIONING ACROSS WEST TX. GIVEN
EXPECTED MARGINAL/ISOLD NATURE...WW IS NOT ANTICIPATED.

WATER VAPOR IMAGERY PORTRAYS CORE OF UPPER TROUGH TRANSITIONING EWD
FROM FAR SE NM INTO WEST TX. IN SPITE OF 50 DEG F SFC TEMPS ACROSS
THE SOUTH PLAINS OF NW TX...DEGREE OF MID LEVEL COOLING ASSOCIATED
WITH UPPER TROUGH -- AS EVIDENT IN -7 DEG C CHANGE AT 500MB BETWEEN
12Z AND 18Z MAF RAOB -- WILL CONTRIBUTE TO STEEPENING LOW TO MID
LEVEL LAPSE RATES THROUGH THE AFTERNOON. SUFFICIENT CLOUD BEARING
SHEAR...MUCAPE OF 500-750 J/KG...AND LAPSE RATES OF 8C/KM OF GREATER
IN 700-500 MB LAYER SUGGEST ISOLD/MARGINALLY SEVERE HAIL MAY BE
POSSIBLE WITH THE MOST VIGOROUS TSTMS THIS AFTERNOON.

..GUYER.. 11/23/2004

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

ATTN...WFO...OUN...SJT...LUB...AMA...MAF...

34120281 34710151 34910038 34669965 33589937 32599986
32770122 33180267

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 22, 6:03 PM CST	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 16 more	2 hr
Nov 22, 10:30 PM CST	Mesoscale Discussion	SPC	Borden, Coke, Crockett, Dawson, Fisher, Garza and 21 more	2 hr
Nov 22, 11:00 PM CST	Tornado Watch	SPC	Andrews, Borden, Coke, Crane, Crockett, Dawson and 22 more	6 hr
Nov 23, 2:58 AM CST	Mesoscale Discussion	SPC	Borden, Coke, Crockett, Fisher, Glasscock, Howard and 11 more	92 min
Nov 23, 4:10 AM CST	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 19 more	5 hr
Nov 23, 7:06 AM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bastrop, Bell, Blanco and 46 more	84 min
Nov 23, 7:19 AM CST	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Denton and 13 more	86 min
Nov 23, 7:40 AM CST	Mesoscale Discussion	SPC	Dallam	6 hr
Nov 23, 8:45 AM CST	Tornado Watch	SPC	Anderson, Austin, Bastrop, Bell, Blanco, Brazos and 47 more	6 hr
Nov 23, 9:15 AM CST	Mesoscale Discussion	SPC	Collin, Dallas, Delta, Denton, Fannin, Grayson and 5 more	3 hr
Nov 23, 9:45 AM CST	Tornado Watch	SPC	Angelina, Austin, Brazoria, Calhoun, Chambers, Colorado and 25 more	5 hr
Nov 23, 10:37 AM CST	Mesoscale Discussion	SPC	Anderson, Austin, Bastrop, Bell, Blanco, Brazos and 47 more	113 min
Nov 23, 11:38 AM CST	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Calhoun, Chambers, Colorado and 25 more	2 hr
Nov 23, 12:15 PM CST	Mesoscale Discussion	SPC	Carson, Dallam, Hansford, Hartley, Hutchinson, Moore and 3 more	5 hr
Nov 23, 12:16 PM CST	Mesoscale Discussion	SPC	Bosque, Brown, Coke, Coleman, Concho, Coryell and 22 more	2 hr
Nov 23, 12:48 PM CST	Mesoscale Discussion	SPC	Anderson, Bastrop, Bell, Blanco, Brazoria, Brazos and 58 more	117 min
Nov 23, 2:00 PM CST	Tornado Watch	SPC	Anderson, Angelina, Austin, Bowie, Brazoria, Brazos and 42 more	7 hr
Nov 23, 3:15 PM CST	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bexar, Blanco, Bosque, Brown and 40 more	5 hr
Nov 23, 3:21 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bowie, Brazoria, Brazos and 42 more	114 min
Nov 23, 5:30 PM CST	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 64 more	6 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.