Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 263

April 4, 2004Brewster County, Terrell County, Val Verde County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2004, 1:23 PM CDT for Brewster County, Terrell County, Val Verde County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 4, 2004, 1:23 PM CDT (18:23 UTC)
Expired: Apr 4, 2004, 3:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Brewster County, TX, Terrell County, TX, Val Verde County, TX

The radar

The Midland/Odessa radar (KMAF), 212 km from the middle of the area, began a volume at 18:26 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 42Apr 4, 2:10 PM CDT

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 6.4 hours before the alert went out and 199 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: 100 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 261 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.

599 
ACUS11 KWNS 041824
SWOMCD
SPC MCD 041823 
TXZ000-042030-

MESOSCALE DISCUSSION 0263
NWS STORM PREDICTION CENTER NORMAN OK
0123 PM CDT SUN APR 04 2004

AREAS AFFECTED...SW TX INCLUDING THE DAVIES MOUNTAINS SND SRN
TRANSPECOS REGION

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 041823Z - 042030Z

STORMS EXPECTED TO INTENSIFY THIS AFTERNOON OVER THE DAVIS MOUNTAINS
AND SRN PORTIONS OF THE TRANSPECOS REGION. LARGE HAIL AND DAMAGING
WIND GUSTS WILL BE THE PRIMARY THREATS. AREA WILL CONTINUE TO BE
MONITORED FOR POSSIBLE WW.

THIS AFTERNOON AN OUTFLOW BOUNDARY WITH ONGOING CONVECTION EXTENDS
FROM NEAR MIDLAND SWWD TO NEAR MARFA. A QUASISTATIONARY FRONT
EXTENDS FROM N OF DEL RIO...NWWD TO NEAR FORT STOCKTON WHERE IT
INTERSECTS THE OUTFLOW BOUNDARY. LOW LEVEL MOISTURE WITH SURFACE
DEWPOINTS IN THE 50S PERSIST E OF THE OUTFLOW BOUNDARY AND S OF THE
FRONT. BREAKS IN THE CLOUDS OVER THE MOUNTAINS AND STEEP LAPSE RATES
WILL CONTRIBUTE TO DESTABILIZATION IN THIS AREA WITH MLCAPE FROM 500
TO 1000 J/KG EXPECTED. SHORT TERM TRENDS HAVE BEEN FOR STORMS ALONG
THE OUTFLOW BOUNDARY TO DECREASE. ADDITIONAL STORMS MAY DEVELOP AND
INTENSIFY ALONG THIS BOUNDARY AS DOWNSTREAM ATMOSPHERE DESTABILIZES.
OTHER STORMS WILL LIKELY INCREASE OVER THE MOUNTAINS AS SURFACE
HEATING ENHANCES OROGRAPHIC FORCING AND AS TAIL END OF VORT MAX
LIFTS NWD THROUGH SW TX. SHEAR PROFILES WILL REMAIN SUFFICIENT FOR
ORGANIZED STORMS INCLUDING BOW ECHOES AND SUPERCELLS.

..DIAL.. 04/04/2004

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

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

29860252 29070317 29560429 29910428 30470302 30780252
31070227 30580172 29760095

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 4:40 AM CDT	Mesoscale Discussion	SPC	Crane, Crockett, Culberson, Ector, Jeff Davis, Kinney and 8 more	3 hr
Apr 4, 11:38 AM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Dimmit, Duval, Hidalgo, Jim Hogg and 9 more	3 hr
Apr 4, 12:41 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bexar, Caldwell, DeWitt, Dimmit, Frio and 7 more	3 hr
Apr 4, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Dimmit, Duval, Frio, Jim Wells, Karnes and 8 more	6 hr
Apr 4, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	Brewster, Presidio, Terrell	6 hr
Apr 4, 3:30 PM CDT	Mesoscale Discussion	SPC	Atascosa, Duval, Jim Wells, Karnes, La Salle, Live Oak and 3 more	2 hr
Apr 4, 5:32 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bastrop, Bee, Bexar, Burleson and 19 more	118 min
Apr 4, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Bee, Brooks, Duval, Goliad and 15 more	4 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.