Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 779

May 10, 20125 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 10, 2012, 5:21 PM CDT for 5 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 10, 2012, 5:21 PM CDT (22:21 UTC)
Expired: May 10, 2012, 6:15 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Crockett County, TX, Edwards County, TX, Sutton County, TX, Terrell County, TX, Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 132 km from the middle of the area, began a volume at 22:22 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

Del Rio, TX (KDRT), launched 12:00Z, 10.4 hours before the alert went out and 88 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: 1149 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 7.4

Open this sounding in Storm Lab

The text

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

428 
ACUS11 KWNS 102221
SWOMCD
SPC MCD 102221 
TXZ000-102315-

MESOSCALE DISCUSSION 0779
NWS STORM PREDICTION CENTER NORMAN OK
0521 PM CDT THU MAY 10 2012

AREAS AFFECTED...WEST AND SOUTHWEST TX

CONCERNING...SEVERE THUNDERSTORM WATCH 272...

VALID 102221Z - 102315Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 272
CONTINUES.

SUMMARY...AN ISOLATED SEVERE THREAT SHOULD CONTINUE ACROSS PARTS OF
WEST TX EARLY THIS EVENING. LARGE HAIL AND ISOLATED WIND DAMAGE WILL
BE POSSIBLE WITH THE STRONGER CELLS. A LOCAL WWD EXTENSION MAY BE
NEEDED BY WFO SAN ANGELO FOR WW 272.

DISCUSSION...WATER VAPOR IMAGERY CURRENTLY SHOWS AN UPPER-LEVEL LOW
OVER WEST TX. STRONG THUNDERSTORMS ARE ONGOING TO THE EAST OF THE
LOW ALONG AN AXIS OF MODERATE INSTABILITY /MLCAPE 1000 TO 1500 J/KG/
EXTENDING NWWD INTO WEST TX. THE ENVIRONMENT IS CHARACTERIZED BY
MODERATE TO STRONG DEEP LAYER SHEAR AND STEEP MID-LEVEL LAPSE RATES.
IN ADDITION...TEMPS ALOFT ASSOCIATED WITH THE UPPER-LEVEL LOW ARE IN
THE -12C TO -14C RANGE SUGGESTING LARGE HAIL WILL BE LIKELY WITH THE
STRONGER CORES. WIND DAMAGE COULD ALSO OCCUR ESPECIALLY IF A LINE
CAN ORGANIZE AS SOME MODEL FORECASTS SUGGEST. SHORT-TERM TRENDS
SUGGEST THE CONVECTION WILL MOVE INTO PARTS OF CROCKETT COUNTY OVER
THE NEXT HOUR. THEREFORE...WW 272 MAY NEED TO BE LOCALLY EXTENDED
WWD.

..BROYLES.. 05/10/2012

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

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

LAT...LON   29360111 29330073 29510014 30089983 30700002 30990118
            31040172 30860213 30410242 30010243 29770228 29580205
            29490150 29360111

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 10:09 PM CDT	Mesoscale Discussion	SPC	Hidalgo, Kenedy, Willacy	66 min
May 10, 5:27 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 19 more	2 hr
May 10, 5:42 AM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bee, Bexar, Brooks, Cameron and 36 more	7 hr
May 10, 9:51 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bee, Bexar, Brooks, Cameron and 39 more	114 min
May 10, 11:40 AM CDT	Tornado Watch	SPC	Aransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 27 more	8 hr
May 10, 11:52 AM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Brown, Coke, Coleman and 24 more	53 min
May 10, 12:32 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 25 more	7 hr
May 10, 2:07 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Brooks, DeWitt, Dimmit and 19 more	113 min
May 10, 3:04 PM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more	116 min
May 10, 5:43 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Brooks, Cameron, DeWitt and 23 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2012 Every 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.