Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 45, NWS Brownsville, TX

April 20, 2012Willacy County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Apr 20, 2012, 5:40 PM CDT for Willacy County, Texas. It was in force for 50 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, 5:40 PM CDT (22:40 UTC)
Expired
Apr 20, 2012, 6:30 PM CDT
In force
50 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon

County Willacy County, TX

The radar

The Brownsville radar (KBRO), 59 km from the middle of the area, began a volume at 22:43 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, 5:45 PM CDTFUNNEL CLOUDRaymondville, TXFUNNEL CLOUD REPORTED IN RAYMONDVILLE.
Apr 20, 5:45 PM CDTTORNADO1 Se Raymondville, TXBRIEF TOUCHDOWN AND LIFT UP. NO DAMAGE REPORTED.
Apr 20, 5:51 PM CDTHAIL 0.75S Raymondville, TXPENNY SIZED HAIL REPORTED SOUTH OF RAYMONDVILLE.
Apr 20, 5:52 PM CDTHAIL 1.751 Ssw Raymondville, TXREPORTED ALL OVER TOWN. LOCATION OF THIS REPORT AT EOC ON S. 7TH STREET. DURATION OF HAIL TWO MINUTES.
Apr 20, 6:10 PM CDTHAIL 1.75Lyford, TXGOLFBALL SIZE HAIL REPORTED ON HIGHWAY 77 NEAR LYFORD.

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, 10.7 hours before the alert went out and 62 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.

856 
WUUS54 KBRO 202240
SVRBRO
TXC489-202330-
/O.NEW.KBRO.SV.W.0045.120420T2240Z-120420T2330Z/

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

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

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

* UNTIL 630 PM CDT

* AT 540 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING BASEBALL SIZE HAIL AND
  DESTRUCTIVE 70 MPH WINDS...OVER RAYMONDVILLE...MOVING SOUTHEAST AT
  30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RAYMONDVILLE.
  LYFORD.
  WILLAMAR.
  PORFIRIO.
  SANTA MONICA.

THIS IS AN EXTREMELY DANGEROUS STORM. TAKE COVER IN AN INTERIOR ROOM!
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 2636 9748 2634 9749 2633 9751 2631 9750
      2632 9751 2633 9751 2631 9753 2636 9785
      2645 9787 2647 9799 2660 9775 2655 9744
TIME...MOT...LOC 2240Z 320DEG 27KT 2647 9775

$$

JGG
2 follow-up statements
190 
WWUS54 KBRO 202244
SVSBRO

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

TXC489-202330-
/O.CON.KBRO.SV.W.0045.000000T0000Z-120420T2330Z/
WILLACY-
544 PM CDT FRI APR 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR WILLACY COUNTY...

AT 544 PM CDT NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM OVER RAYMONDVILLE...MOVING SOUTHEAST AT 
30 MPH. THIS STORM IS CAPABLE OF BASEBALL TO SOFTBALL SIZED HAIL AND 
DESTRUCTIVE WINDS TO 70 MPH! TAKE COVER IN AN INTERIOR ROOM AWAY 
FROM WINDOWS!

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RAYMONDVILLE.
  WILLAMAR.
  LOS COYOTES.
  PORFIRIO.
  SANTA MONICA.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  DESTRUCTIVE BASEBALL SIZE HAIL.
  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 2636 9748 2634 9749 2633 9751 2631 9750
      2632 9751 2633 9751 2631 9753 2636 9785
      2645 9787 2647 9799 2660 9775 2655 9744
TIME...MOT...LOC 2244Z 320DEG 27KT 2645 9773

$$

JGG
048 
WWUS54 KBRO 202301
SVSBRO

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

TXC489-202330-
/O.CON.KBRO.SV.W.0045.000000T0000Z-120420T2330Z/
WILLACY-
601 PM CDT FRI APR 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHERN WILLACY COUNTY...

AT 601 PM CDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED GOLFBALL 
SIZED HAIL AT THE RAYMONDVILLE EMERGENCY OPERATIONS CENTER WHEN THE 
STORM PASSED.

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE SEVERE
THUNDERSTORM WAS NOW 8 MILES SOUTHEAST OF RAYMONDVILLE...MOVING SOUTH
AT 15 MPH. HAIL FROM GOLFBALL TO BASEBALL SIZE WILL BE POSSIBLE. 
TAKE COVER IN AN INTERIOR ROOM!

THE SEVERE THUNDERSTORM WILL BE NEAR...
  LOS COYOTES.
  SANTA MONICA.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  GOLFBALL SIZE HAIL...WITH POSSIBLE DAMAGE.

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 2636 9748 2633 9751 2632 9750 2633 9752
      2631 9753 2636 9784 2637 9785 2645 9787
      2647 9798 2652 9776 2648 9747
TIME...MOT...LOC 2301Z 343DEG 13KT 2638 9769

$$

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, 5:53 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, 6:18 PM CDTSevere Thunderstorm WarningBROCameron42 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.