Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 772

May 10, 201225 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 10, 2012, 5:27 AM CDT for 25 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2012, 5:27 AM CDT (10:27 UTC)
Expired
May 10, 2012, 7:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 25 counties

Atascosa County, TX, Bandera County, TX, Brooks County, TX, Dimmit County, TX, Duval County, TX, Edwards County, TX, Frio County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Starr County, TX, Sutton County, TX, Terrell County, TX, Uvalde County, TX, Val Verde County, TX, Webb County, TX, Zapata County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 86 km from the middle of the area, began a volume at 10:31 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.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 10.5 hours before the alert went out and 122 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, Del Rio, TX at 00:00Z on 2012-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 474 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, Del Rio, TX at 00:00Z on 2012-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -47 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
474 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
1152 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-47 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.5

Open this sounding in Storm Lab

The text

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

987 
ACUS11 KWNS 101027
SWOMCD
SPC MCD 101027 
TXZ000-101230-

MESOSCALE DISCUSSION 0772
NWS STORM PREDICTION CENTER NORMAN OK
0527 AM CDT THU MAY 10 2012

AREAS AFFECTED...RIO GRANDE VALLEY

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 

VALID 101027Z - 101230Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...STORMS WILL INCREASE IN COVERAGE OVER MUCH OF THE RIO
GRANDE VALLEY THIS MORNING...WITH LARGE HAIL LIKELY.

DISCUSSION...STORMS ARE BEGINNING TO FORM ACROSS THE RIO GRANDE
VALLEY IN RESPONSE TO THE UPPER TROUGH. AREA VWPS AND PROFILERS
INDICATE INCREASING AND BACKING LOW LEVEL FLOW...WHICH WILL HELP TO
BRING MOISTURE NWWD. THE VEERING WINDS WITH HEIGHT AS WELL AS LONG
HODOGRAPHS WILL FAVOR SUPERCELLS CAPABLE OF LARGE HAIL.

..JEWELL/CORFIDI.. 05/10/2012

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

ATTN...WFO...CRP...EWX...BRO...SJT...MAF...

LAT...LON   29800223 30390221 30930027 30199902 29039835 27479800
            26799814 26179859 26299904 26909948 27539977 27880003
            28580057 29300119 29430144 29800223

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, 5:42 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, 2:07 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Brooks, DeWitt, Dimmit and 19 more113 min
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.