Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Brownsville, TX

April 20, 2012Cameron County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Apr 20, 2012, 6:18 PM CDT for Cameron County, Texas. It was in force for 42 min. 5 reports 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
Apr 20, 2012, 6:18 PM CDT (23:18 UTC)
Expired
Apr 20, 2012, 7:00 PM CDT
In force
42 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon

County Cameron County, TX

The radar

The Brownsville radar (KBRO), 10 km from the middle of the area, began a volume at 23:20 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
Apr 20, 6:38 PM CDTFUNNEL CLOUD2 N San Benito, TXFUNNEL CLOUD REPORTED ON NORTH SIDE OF SAN BENITO.
Apr 20, 6:45 PM CDTHAIL 0.88Los Fresnos, TXSKYWARN SPOTTER REPORTS NICKEL SIZE HAIL
Apr 20, 6:48 PM CDTHAIL 1Los Fresnos, TXQUARTER SIZED HAIL AND WIND GUSTS OF AT LEAST 50 MPH.
Apr 20, 7:00 PM CDTHAIL 11 Sse Brownsville, TXINTERSECTION OF SOUTHMOST AND INTERNATIONAL BLVD. NICKEL TO QUARTER SIZE STONES.
Apr 20, 7:10 PM CDTHAIL 15 Ssw Rancho Viejo, TXMOSTLY NICKEL SIZED BUT SEVERAL STONES OF QUARTER SIZED EMBEDDED.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 20, 2:29 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 12:00Z, 11.3 hours before the alert went out and 12 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 2012-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1336 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, Brownsville Intl, TX at 12:00Z on 2012-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 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
1336 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
742 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

955 
WUUS54 KBRO 202318
SVRBRO
TXC061-210000-
/O.NEW.KBRO.SV.W.0049.120420T2318Z-120421T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
618 PM CDT FRI APR 20 2012

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAMERON COUNTY IN DEEP SOUTH TEXAS.

* UNTIL 700 PM CDT

* AT 618 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING GOLF BALL SIZE HAIL AND
  DAMAGING 60 MPH WINDS...OVER LAURELES...MOVING SOUTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LOZANO.
  LAURELES.
  LOS FRESNOS.
  LAGUNA VISTA.
  REID HOPE KING.
  VILLA PANCHO.
  BROWNSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2588 9751 2593 9755 2593 9758 2596 9759
      2596 9761 2601 9765 2602 9769 2604 9772
      2629 9757 2609 9727 2606 9720 2592 9731
      2591 9736 2587 9735 2584 9738
TIME...MOT...LOC 2318Z 310DEG 29KT 2614 9754

$$

JGG
4 follow-up statements
563 
WWUS54 KBRO 202342
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
642 PM CDT FRI APR 20 2012

TXC061-210000-
/O.CON.KBRO.SV.W.0049.000000T0000Z-120421T0000Z/
CAMERON-
642 PM CDT FRI APR 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR CAMERON COUNTY...

AT 642 PM CDT...A WEATHER SPOTTER REPORTED QUARTER SIZED HAIL IN 
HARLINGEN.

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE SEVERE
THUNDERSTORM WAS NOW OVER LAURELES...MOVING SOUTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  LOS FRESNOS.
  DEL MAR HEIGHTS.
  LOS CUATES.
  REID HOPE KING.
  SOUTH POINT.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  QUARTER SIZE HAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2588 9751 2593 9755 2593 9758 2596 9759
      2596 9761 2601 9765 2602 9769 2604 9772
      2629 9757 2609 9727 2606 9720 2592 9731
      2591 9736 2587 9735 2584 9738
TIME...MOT...LOC 2342Z 310DEG 33KT 2608 9746

$$

JGG
539 
WWUS54 KBRO 202348
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
648 PM CDT FRI APR 20 2012

TXC061-210000-
/O.CON.KBRO.SV.W.0049.000000T0000Z-120421T0000Z/
CAMERON-
648 PM CDT FRI APR 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR CAMERON COUNTY...

AT 648 PM CDT...A WEATHER SPOTTER REPORTED QUARTER SIZED HAIL AND 50 
MPH WINDS NEAR LOS FRESNOS. RADAR INDICATES A LARGE SEVERE 
THUNDERSTORM FROM NEAR LOS FRESNOS TO SAN BENITO MOVING SOUTHEAST AT 
30 MPH. HAIL TO AROUND ONE AND ONE HALF INCHES IN DIAMETER IS 
POSSIBLE WITH THIS STORM AS WELL AS DAMAGING WINDS TO 60 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  DEL MAR HEIGHTS.
  BROWNSVILLE.
  REID HOPE KING.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  QUARTER SIZE HAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2588 9751 2593 9755 2593 9758 2596 9759
      2596 9761 2601 9765 2602 9769 2604 9772
      2628 9756 2609 9727 2606 9720 2592 9731
      2591 9736 2587 9735 2584 9738
TIME...MOT...LOC 2348Z 314DEG 36KT 2605 9745

$$

JGG
773 
WWUS54 KBRO 202355
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
655 PM CDT FRI APR 20 2012

TXC061-210000-
/O.CON.KBRO.SV.W.0049.000000T0000Z-120421T0000Z/
CAMERON-
655 PM CDT FRI APR 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHERN CAMERON COUNTY...

AT 655 PM CDT NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM 5 MILES EAST OF OLMITO...MOVING 
SOUTHEAST AT 50 MPH. THIS STORM IS STRENGTHENING AND APPEARS CAPABLE 
OF GOLFBALL SIZED HAIL.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  DEL MAR HEIGHTS.
  REID HOPE KING.
  BROWNSVILLE.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  GOLFBALL SIZE HAIL...WITH POSSIBLE DAMAGE.
  DAMAGING WIND GUSTS OF 60 TO 70 MILES AN HOUR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2588 9751 2593 9755 2593 9758 2596 9759
      2596 9761 2601 9765 2602 9769 2606 9768
      2620 9747 2609 9727 2606 9720 2592 9731
      2591 9736 2587 9735 2584 9738
TIME...MOT...LOC 2355Z 310DEG 42KT 2601 9743

$$

JGG
684 
WWUS54 KBRO 202358 RRA
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
658 PM CDT FRI APR 20 2012

TXC061-210009-
/O.EXP.KBRO.SV.W.0049.000000T0000Z-120421T0000Z/
CAMERON-
658 PM CDT FRI APR 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CAMERON COUNTY WILL
EXPIRE AT 700 PM CDT...

IT HAS BEEN REPLACED BY A NEW WARNING.


LAT...LON 2588 9751 2593 9755 2593 9758 2596 9759
      2596 9761 2601 9765 2602 9769 2606 9768
      2620 9747 2609 9727 2606 9720 2592 9731
      2591 9736 2587 9735 2584 9738
TIME...MOT...LOC 2359Z 310DEG 42KT 2598 9739

$$

JGG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 3:54 AM CDTSmall Craft AdvisoryBRO42 hr
Apr 20, 3:54 AM CDTSmall Craft Advisory for WindsBRO30 hr
Apr 20, 3:09 PM CDTSevere Thunderstorm WarningBROBrooks, Jim Hogg51 min
Apr 20, 3:57 PM CDTSevere Thunderstorm WarningBROBrooks, Jim Hogg, Starr48 min
Apr 20, 4:12 PM CDTTornado WarningBROJim Hogg10 min
Apr 20, 4:14 PM CDTSevere Thunderstorm WarningBROHidalgo, Starr46 min
Apr 20, 4:18 PM CDTSevere Thunderstorm WarningBROBrooks, Kenedy42 min
Apr 20, 4:36 PM CDTAreal Flood AdvisoryBROBrooks114 min
Apr 20, 4:37 PM CDTSevere Thunderstorm WarningBROKenedy38 min
Apr 20, 4:38 PM CDTSevere Thunderstorm WarningBROHidalgo52 min
Apr 20, 4:58 PM CDTSevere Thunderstorm WarningBROKenedy47 min
Apr 20, 5:04 PM CDTSpecial Marine WarningBRO2 hr
Apr 20, 5:08 PM CDTSevere Thunderstorm WarningBROHidalgo52 min
Apr 20, 5:16 PM CDTSevere Thunderstorm WarningBROKenedy, Willacy27 min
Apr 20, 5:17 PM CDTAreal Flood AdvisoryBROHidalgo, Starr118 min
Apr 20, 5:20 PM CDTAreal Flood AdvisoryBROKenedy115 min
Apr 20, 5:27 PM CDTTornado WarningBROWillacy14 min
Apr 20, 5:30 PM CDTSevere Thunderstorm WarningBROHidalgo, Starr45 min
Apr 20, 5:40 PM CDTSevere Thunderstorm WarningBROWillacy50 min
Apr 20, 5:53 PM CDTSevere Thunderstorm WarningBROCameron, Hidalgo52 min
Apr 20, 5:56 PM CDTSevere Thunderstorm WarningBROHidalgo24 min
Apr 20, 6:11 PM CDTSevere Thunderstorm WarningBROHidalgo, Willacy29 min
Apr 20, 6:30 PM CDTAreal Flood AdvisoryBROCameron, Willacy2 hr
Apr 20, 6:30 PM CDTTornado WarningBROCameron30 min
Apr 20, 6:56 PM CDTSevere Thunderstorm WarningBROCameron49 min
Apr 20, 6:57 PM CDTTornado WarningBROCameron12 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.