Alert archive

Mesoscale Discussion 812

May 14, 2012

The Storm Prediction Center issued this mesoscale discussion at May 14, 2012, 5:46 PM CDT. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
May 14, 2012, 5:46 PM CDT (22:46 UTC)
Expired
May 14, 2012, 6:45 PM CDT
In force
59 min
Issued by
the Storm Prediction Center

The radar

The Laughlin AFB radar (KDFX), 159 km from the middle of the area, began a volume at 22:47 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, 10.8 hours before the alert went out and 116 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 12:00Z on 2012-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2012-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2014 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
228 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.

892 
ACUS11 KWNS 142246
SWOMCD
SPC MCD 142246 
TXZ000-142345-

MESOSCALE DISCUSSION 0812
NWS STORM PREDICTION CENTER NORMAN OK
0546 PM CDT MON MAY 14 2012

AREAS AFFECTED...FAR WEST TX INCLUDING THE MIDDLE RIO GRANDE RIVER
VALLEY

CONCERNING...SEVERE THUNDERSTORM WATCH 277...

VALID 142246Z - 142345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 277
CONTINUES.

SUMMARY...STRONG/SEVERE THUNDERSTORMS HAVE MOSTLY SHIFTED SOUTH OF
THE BIG BEND REGION AND WILL REMAIN FOCUSED ACROSS NERN MEXICO FOR
THE NEXT FEW HOURS.

DISCUSSION...LATEST SATELLITE/RADAR IMAGERY CLEARLY DEPICTS CENTER
OF LOW CIRCULATION JUST WEST OF LBB SHIFTING SOUTH IN LINE WITH
SHORT RANGE MODEL GUIDANCE.  CONSIDERABLE AMOUNT OF CONVECTION IS
NOTED AHEAD OF THIS FEATURE ACROSS MUCH OF WEST TX AND OVERTURNING
HAS EFFICIENTLY DESTROYED STRONGER INSTABILITY ACROSS ALL BUT
PORTIONS OF SWRN TX FROM THE SRN BALCONES ESCARPMENT INTO NERN
MEXICO.  GIVEN THAT STEEPER LAPSE RATES ARE NOW FOCUSED ACROSS NERN
MEXICO IT APPEARS THE STRONGEST STORMS WILL REMAIN SOUTH OF THE
BORDER FOR THE NEXT FEW HOURS.  THERE IS SOME CONCERN THAT STRONG
CONVECTION MAY APPROACH THE MIDDLE RIO GRANDE VALLEY LATE AS MID
LEVEL SPEED MAX DIGS TOWARD SOUTH TX.

..DARROW.. 05/14/2012

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

ATTN...WFO...CRP...EWX...MAF...

LAT...LON   29480130 28490009 27610030 27610157 28820414 29810393
            29480130

Nearby

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.