Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 271

April 5, 200413 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2004, 3:51 PM CDT for 13 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Apr 5, 2004, 3:51 PM CDT (20:51 UTC)
Expired: Apr 5, 2004, 5:45 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

Counties Brewster County, TX, Crane County, TX, Culberson County, TX, Hudspeth County, TX, Jeff Davis County, TX, Loving County, TX, Pecos County, TX, Presidio County, TX, Reeves County, TX, Terrell County, TX, Val Verde County, TX, Ward County, TX, Winkler County, TX

The radar

The Midland/Odessa radar (KMAF), 227 km from the middle of the area, began a volume at 20:53 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

Midland Regional, TX (KMAF), launched 12:00Z, 8.9 hours before the alert went out and 227 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: 714 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

474 
ACUS11 KWNS 052052
SWOMCD
SPC MCD 052051 
TXZ000-052245-

MESOSCALE DISCUSSION 0271
NWS STORM PREDICTION CENTER NORMAN OK
0351 PM CDT MON APR 05 2004

AREAS AFFECTED...SWRN TX

CONCERNING...SEVERE THUNDERSTORM WATCH 44...

VALID 052051Z - 052245Z

...LARGE HAIL/ISOLD DAMAGING WIND THREATS CONTINUE ACROSS SWRN TX...


SATELLITE CONTINUES TO SHOW TSTM LINES/CLUSTERS ADVANCING NEWD
ACROSS NERN CHIHUAHUA...NRN COAHUILA AND SWRN TX.  STRONGEST TSTMS
APPEAR TO BE MOVING INTO SRN HUDSPETH...JEFF DAVIS AND PRESIDIO
COUNTIES IN CONJUNCTION WITH THE LEADING EDGE OF STRONGEST LARGE
SCALE ASCENT.  

STRONGEST BOUNDARY LAYER HEATING AND SUBSEQUENT DESTABILIZATION HAS
OCCURRED ACROSS THE BIG BEND REGION SOUTH OF KMRF THIS AFTERNOON. 
AS A RESULT...AS THE STRONGER LARGE SCALE ASCENT SPREADS
EWD...HIGHER PROBABILITIES FOR MORE INTENSE TSTMS SHOULD DEVELOP
ESEWD WITH TIME TOWARD THE BIG BEND REGION.  HOWEVER...LARGE HAIL
COULD ALSO OCCUR WITH STORMS FARTHER NORTH TOWARD THE NM BORDER. 
THESE STORMS WOULD LIKELY BE MORE ELEVATED AND SHORT LIVED AS
COMPARED TO THE TSTMS FARTHER SOUTH.

AS INFERRED BY VSBL SATELLITE ACROSS NERN CHIHUAHUA...VERTICAL SHEAR
WILL BE ENOUGH FOR SUPERCELLS. WHILE INITIAL DEVELOPMENT HAS PROVEN
TO BE DISCRETE...INDICATIONS ARE THAT SHORT LINE SEGMENTS ARE
BEGINNING TO FORM.  GIVEN THE COOL PROFILE...THE STRONGEST
CELLS/EMBEDDED SUPERCELLS...WILL LIKELY YIELD LARGE HAIL AND PERHAPS
AN ISOLD DAMAGING WIND GUST.

..RACY.. 04/05/2004

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

ATTN...WFO...EWX...SJT...MAF...EPZ...

28960363 31970633 31970293 28980034

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 8:40 PM CDT	Mesoscale Discussion	SPC	Brooks, Jim Hogg, Kleberg, Nueces, Starr, Zapata	2 hr
Apr 4, 10:21 PM CDT	Mesoscale Discussion	SPC	Aransas, Brooks, Hidalgo, Jim Hogg, Kenedy, Kleberg and 3 more	114 min
Apr 5, 1:09 PM CDT	Mesoscale Discussion	SPC	Brewster, Culberson, Hudspeth, Jeff Davis, Pecos, Presidio and 2 more	96 min
Apr 5, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	Brewster, Crane, Culberson, Hudspeth, Jeff Davis, Loving and 7 more	6 hr
Apr 5, 6:05 PM CDT	Mesoscale Discussion	SPC	Brewster, Crockett, Edwards, Kinney, Maverick, Real and 3 more	2 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.