Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Brownsville, TX

May 12, 2012Willacy County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at May 12, 2012, 4:50 PM CDT for Willacy County, Texas. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 12, 2012, 4:50 PM CDT (21:50 UTC)
Expired
May 12, 2012, 5:30 PM CDT
In force
40 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon

County Willacy County, TX

The radar

The Brownsville radar (KBRO), 75 km from the middle of the area, began a volume at 21:52 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.

What was reported inside it

TimeReportWhereRemark
May 12, 5:00 PM CDTHAIL 1Raymondville, TXPUBLIC REPORTED QUARTER SIZE HAIL ON BUS NEAR RAYMONDVILLE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 12:00Z, 9.8 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, Brownsville Intl, TX at 12:00Z on 2012-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3455 joules per kilogram.LCLEL10008507005003002001001 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, Brownsville Intl, TX at 12:00Z on 2012-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
3455 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

678 
WUUS54 KBRO 122150
SVRBRO
TXC489-122230-
/O.NEW.KBRO.SV.W.0077.120512T2150Z-120512T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
450 PM CDT SAT MAY 12 2012

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WILLACY COUNTY IN DEEP SOUTH TEXAS.

* UNTIL 530 PM CDT

* AT 451 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL AND
  DAMAGING 60 MPH WINDS...OVER RAYMONDVILLE...MOVING NORTHWEST AT 5
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RAYMONDVILLE.
  YTURRIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND
HAIL THE SIZE OF QUARTERS OR LARGER. MOVE TO A PLACE OF SAFETY.

WIND GUSTS TO 60 MPH OR MORE WILL CAUSE SOME STRUCTURAL DAMAGE...
MAINLY TO TREES AND POWER LINES. POORLY ANCHORED ROOFS...MOBILE
HOMES...AND SHEDS ARE ALSO AT RISK.

QUARTER SIZE HAIL IS LIKELY. MOVE INDOORS IMMEDIATELY.

PLEASE REPORT TORNADOES OR FUNNEL CLOUDS...WINDS OF 58 MPH OR
HIGHER...HAIL THE SIZE OF PENNIES OR LARGER...AND ANY WIND DAMAGE TO
YOUR NATIONAL WEATHER SERVICE IN BROWNSVILLE BY CALLING 956-504-1432.

&&

LAT...LON 2642 9779 2651 9790 2660 9777 2660 9764
      2656 9761
TIME...MOT...LOC 2151Z 135DEG 5KT 2653 9776

$$

61
2 follow-up statements
230 
WWUS54 KBRO 122216
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
516 PM CDT SAT MAY 12 2012

TXC489-122230-
/O.CON.KBRO.SV.W.0077.000000T0000Z-120512T2230Z/
WILLACY-
516 PM CDT SAT MAY 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHERN WILLACY COUNTY...

AT 500 PM CDT...THE PUBLIC REPORTED QUARTER SIZE HAIL NEAR 
RAYMONDVILLE.

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE SEVERE
THUNDERSTORM WAS NOW 3 MILES NORTHEAST OF RAYMONDVILLE...MOVING NORTH
AT 5 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  LOS ANGELES SUBDIVISION.
  YTURRIA.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  QUARTER SIZE HAIL.
  60 MPH WIND GUSTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.

PLEASE REPORT TORNADOES OR FUNNEL CLOUDS...WINDS OF 58 MPH OR
HIGHER...HAIL THE SIZE OF PENNIES OR LARGER...AND ANY WIND DAMAGE TO
YOUR NATIONAL WEATHER SERVICE IN BROWNSVILLE BY CALLING 956-504-1432.

&&


LAT...LON 2645 9775 2652 9781 2660 9777 2660 9765
      2660 9764 2656 9761 2656 9762
TIME...MOT...LOC 2213Z 178DEG 4KT 2652 9775

$$

61
423 
WWUS54 KBRO 122227
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
527 PM CDT SAT MAY 12 2012

TXC489-122237-
/O.EXP.KBRO.SV.W.0077.000000T0000Z-120512T2230Z/
WILLACY-
527 PM CDT SAT MAY 12 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WILLACY COUNTY WILL
EXPIRE AT 530 PM CDT...

AT 527 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED THE 
THUNDERSTORM HAD WEAKENED AND WAS NO LONGER SEVERE...THUS THE WARNING
HAS BEEN ALLOWED TO EXPIRE.

DOPPLER RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY
WINDS WERE STILL POSSIBLE FROM THE THUNDERSTORM.


LAT...LON 2645 9775 2652 9781 2660 9777 2660 9765
      2660 9764 2656 9761 2656 9762
TIME...MOT...LOC 2227Z 178DEG 4KT 2654 9775

$$

61

The office that day

Everything else NWS Brownsville, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 7:06 PM CDTSevere Thunderstorm WarningBROBrooks39 min
May 11, 10:50 PM CDTAreal Flood AdvisoryBROZapata55 min
May 12, 1:42 AM CDTAreal Flood AdvisoryBROZapata63 min
May 12, 2:13 AM CDTSevere Thunderstorm WarningBROZapata62 min
May 12, 2:28 AM CDTFlash Flood WarningBROZapata92 min
May 12, 3:12 AM CDTSevere Thunderstorm WarningBROZapata63 min
May 12, 3:58 AM CDTFlash Flood WarningBROZapata92 min
May 12, 4:03 PM CDTSevere Thunderstorm WarningBROWillacy42 min
May 12, 4:57 PM CDTAreal Flood AdvisoryBROWillacy63 min
May 12, 5:20 PM CDTSevere Thunderstorm WarningBROCameron25 min
May 12, 5:24 PM CDTAreal Flood AdvisoryBROCameron, Hidalgo, Willacy66 min
May 12, 5:43 PM CDTSevere Thunderstorm WarningBROCameron32 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.