Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 776

May 10, 201225 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 10, 2012, 2:07 PM CDT for 25 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
May 10, 2012, 2:07 PM CDT (19:07 UTC)
Expired
May 10, 2012, 4:00 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 25 counties

Aransas County, TX, Atascosa County, TX, Bee County, TX, Brooks County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Frio County, TX, Goliad County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, Kenedy County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Webb County, TX, Willacy County, TX, Wilson County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 62 km from the middle of the area, began a volume at 19:09 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

Corpus Christi, TX (KCRP), launched 12:00Z, 7.1 hours before the alert went out and 77 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-pSkew-T log-p diagram, Corpus Christi, TX at 12:00Z on 2012-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1593 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 12:00Z on 2012-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1593 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

718 
ACUS11 KWNS 101907
SWOMCD
SPC MCD 101907 
TXZ000-102100-

MESOSCALE DISCUSSION 0776
NWS STORM PREDICTION CENTER NORMAN OK
0207 PM CDT THU MAY 10 2012

AREAS AFFECTED...S TX

CONCERNING...TORNADO WATCH 271...

VALID 101907Z - 102100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 271 CONTINUES.

SUMMARY...SEVERE/ISOLATED TORNADO THREAT WILL CONTINUE OVER THE NEXT
SEVERAL HOURS.

DISCUSSION...LATEST RADAR IMAGERY SHOWS A CLUSTER OF
SEVERE/SUPERCELL STORMS FROM LA SALLE COUNTY NEWD TO GONZALES COUNTY
IN S TX...INVOF THE SURFACE BAROCLINIC ZONE DRAPED ACROSS THIS AREA.
 HEATING OF THE VERY MOIST AIRMASS NEAR AND S OF THIS BOUNDARY HAS
RESULTED IN MODERATE INSTABILITY...WHICH COMBINED WITH THE FAVORABLY
VEERING/SHEARED KINEMATIC ENVIRONMENT IS SUPPORTING PERSISTENT
ROTATING UPDRAFTS.  ANOTHER/ISOLATED SUPERCELL IS INDICATED JUST S
OF CORPUS CHRISTI ATTM...WITH ADDITIONAL DEVELOPMENT ACROSS THIS
REGION POSSIBLE OVER THE NEXT COUPLE OF HOURS.

STORM DEVELOPMENT IS ALSO EXPECTED LATER THIS AFTERNOON ACROSS THE
HIGHER TERRAIN ON THE MEXICAN SIDE OF THE RIO GRANDE...WITH AT LEAST
SOME THREAT THAT STORMS COULD CROSS THE RIVER AND AFFECT PORTIONS OF
S TX.  THIS SCENARIO -- ALONG WITH ONGOING STORMS ACROSS THE TORNADO
WATCH AREA -- SUGGEST A LONG-LIVED SEVERE/TORNADO THREAT WITH
MULTIPLE CONVECTIVE EPISODES.

..GOSS.. 05/10/2012

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

ATTN...WFO...CRP...EWX...BRO...

LAT...LON   26439684 26429807 26689919 28060005 28819957 29479758
            28839679 26439684

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 10:09 PM CDTMesoscale DiscussionSPCHidalgo, Kenedy, Willacy66 min
May 10, 5:27 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 19 more2 hr
May 10, 5:42 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bee, Bexar, Brooks, Cameron and 36 more7 hr
May 10, 9:51 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bee, Bexar, Brooks, Cameron and 39 more114 min
May 10, 11:40 AM CDTTornado WatchSPCAransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 27 more8 hr
May 10, 11:52 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Brown, Coke, Coleman and 24 more53 min
May 10, 12:32 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 25 more7 hr
May 10, 3:04 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more116 min
May 10, 5:21 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Sutton, Terrell, Val Verde54 min
May 10, 5:43 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Brooks, Cameron, DeWitt and 23 more2 hr

Nearby

Mesoscale Discussions in Texas, 2012Every mesoscale discussion in 2012

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.