Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 761

May 8, 20124 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2012, 5:47 PM CDT for 4 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 8, 2012, 5:47 PM CDT (22:47 UTC)
Expired: May 8, 2012, 6:45 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Cameron County, TX, Hidalgo County, TX, Kenedy County, TX, Willacy County, TX

The radar

The Brownsville radar (KBRO), 51 km from the middle of the area, began a volume at 22:48 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

Brownsville Intl, TX (KBRO), launched 12:00Z, 10.8 hours before the alert went out and 54 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: 1588 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

343 
ACUS11 KWNS 082247
SWOMCD
SPC MCD 082247 
TXZ000-082345-

MESOSCALE DISCUSSION 0761
NWS STORM PREDICTION CENTER NORMAN OK
0547 PM CDT TUE MAY 08 2012

AREAS AFFECTED...FAR S TX

CONCERNING...SEVERE THUNDERSTORM WATCH 267...

VALID 082247Z - 082345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 267
CONTINUES.

SUMMARY...ISOLATED THREAT OF DMGG WIND AND HAIL WILL GRADUALLY SHIFT
OFFSHORE. COUNTIES IN THE WAKE OF THE COLD FRONTAL PASSAGE MAY BE
CLEARED. WW WILL BE ALLOWED TO EXPIRE AT 00Z.

DISCUSSION...A CLUSTER OF STRONG THUNDERSTORMS AHEAD OF A SEWD
PROGRESSING COLD FRONT CONTINUES TO QUICKLY MOVE THROUGH THE WW
AREA. VAD WIND PROFILE DATA AT BRO IS SHOWING AROUND 250 M2/S2 0-3
KM SRH...WHICH COMBINED WITH STRENGTHENED MID LEVEL WLYS SHOULD
CONTINUE TO BE SUPPORTIVE OF ROTATING UPDRAFTS. MOIST/UNSTABLE
CONDITIONS IN ADVANCE OF THE FRONT WILL LIKELY MAINTAIN SEVERE
CONVECTION...WHICH WILL QUICKLY MOVE OFFSHORE. AS SUCH...THE WW IS
SCHEDULED TO EXPIRE AT 00Z.

..HURLBUT.. 05/08/2012

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

ATTN...WFO...BRO...

LAT...LON   26269867 26899792 27179706 26019675 25969731 25829740
            26049761 26109825 26269867

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 7, 7:39 PM CDT	Severe Thunderstorm Watch	SPC	Camp, Gregg, Harrison, Marion, Morris, Panola and 5 more	4 hr
May 7, 7:54 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bee, Bexar, Brazos and 40 more	66 min
May 7, 9:15 PM CDT	Mesoscale Discussion	SPC	Camp, Cass, Gregg, Harrison, Marion, Morris and 6 more	60 min
May 7, 9:46 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Crane, Crockett, Dawson, Ector and 15 more	89 min
May 8, 1:42 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Comal, Dimmit, Edwards and 13 more	93 min
May 8, 10:44 AM CDT	Mesoscale Discussion	SPC	Bee, Brooks, Duval, Frio, Goliad, Jim Hogg and 11 more	61 min
May 8, 10:58 AM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 28 more	8 hr
May 8, 1:37 PM CDT	Mesoscale Discussion	SPC	Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio and 1 more	113 min
May 8, 2:07 PM CDT	Severe Thunderstorm Watch	SPC	Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio	7 hr
May 8, 3:03 PM CDT	Mesoscale Discussion	SPC	Cameron, Hidalgo, Starr, Willacy	87 min
May 8, 4:53 PM CDT	Mesoscale Discussion	SPC	Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio	67 min

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.