Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Brownsville, TX

May 12, 2021Cameron County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at May 12, 2021, 2:51 AM CDT for Cameron County, Texas. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 12, 2021, 2:51 AM CDT (07:51 UTC)
Expired
May 12, 2021, 3:30 AM CDT
In force
39 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Cameron County, TX

The radar

The Brownsville radar (KBRO), 8 km from the middle of the area, began a volume at 07:51 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 watch it was issued in

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

IssuedProductOfficeLasted
May 11, 8:34 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 7.9 hours before the alert went out and 10 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 00:00Z on 2021-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2611 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 00:00Z on 2021-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
2611 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
772 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.3

Open this sounding in Storm Lab

The text

As transmitted.

816 
WUUS54 KBRO 120751
SVRBRO
TXC061-120830-
/O.NEW.KBRO.SV.W.0013.210512T0751Z-210512T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Brownsville TX
251 AM CDT Wed May 12 2021

The National Weather Service in Brownsville has issued a

* Severe Thunderstorm Warning for...
  South central Cameron County in Deep South Texas...

* Until 330 AM CDT.

* At 251 AM CDT, a severe thunderstorm was located over Olmito Lake,
  or over Rancho Viejo, moving south at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Los Fresnos, Rancho Viejo, Southmost, Olmito, Cameron Park,
  Downtown Brownsville, Brownsville, Lincoln Park, Longoria
  Elementary School and Sams Memorial Stadium.

This includes the following highways...
 Interstate Highway 69 E between mile markers 1 and 15.
 US Highway 281 between mile markers 828 and 838.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2584 9740 2586 9741 2584 9741 2585 9745
      2587 9744 2588 9746 2588 9750 2590 9750
      2589 9752 2592 9753 2594 9755 2594 9758
      2596 9758 2596 9760 2600 9762 2600 9763
      2608 9764 2612 9744 2585 9737 2584 9738
TIME...MOT...LOC 0751Z 350DEG 18KT 2602 9755 

HAIL...<.75IN
WIND...60MPH
 
$$

TOMASELLI
2 follow-up statements
036 
WWUS54 KBRO 120754
SVSBRO

Severe Weather Statement
National Weather Service Brownsville TX
254 AM CDT Wed May 12 2021

TXC061-120830-
/O.CON.KBRO.SV.W.0013.000000T0000Z-210512T0830Z/
Cameron TX-
254 AM CDT Wed May 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM CDT
FOR SOUTH CENTRAL CAMERON COUNTY...

At 253 AM CDT, a severe thunderstorm was located over Olmito, moving
south at 20 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Los Fresnos, Rancho Viejo, Southmost, Olmito, Cameron Park, Downtown
Brownsville, Brownsville, Lincoln Park, Longoria Elementary School
and Sams Memorial Stadium.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2584 9740 2586 9741 2584 9741 2585 9745
      2587 9744 2588 9746 2588 9750 2590 9750
      2589 9752 2592 9753 2594 9755 2594 9758
      2596 9758 2596 9760 2600 9762 2600 9763
      2608 9764 2612 9744 2585 9737 2584 9738
TIME...MOT...LOC 0753Z 350DEG 18KT 2601 9755 

HAIL...<.75IN
WIND...70MPH
 
$$

TOMASELLI
030 
WWUS54 KBRO 120824
SVSBRO

Severe Weather Statement
National Weather Service Brownsville TX
324 AM CDT Wed May 12 2021

TXC061-120833-
/O.EXP.KBRO.SV.W.0013.000000T0000Z-210512T0830Z/
Cameron TX-
324 AM CDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CAMERON COUNTY
WILL EXPIRE AT 330 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 400 AM CDT for
Deep South Texas.

LAT...LON 2584 9740 2586 9741 2584 9741 2585 9745
      2587 9744 2588 9746 2588 9750 2590 9750
      2589 9752 2592 9753 2594 9755 2594 9758
      2596 9758 2596 9760 2600 9762 2600 9763
      2608 9764 2612 9744 2585 9737 2584 9738
TIME...MOT...LOC 0823Z 350DEG 18KT 2587 9752 

$$

TOMASELLI

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 8:51 PM CDTSpecial Weather StatementBROZapata39 min
May 11, 9:11 PM CDTSevere Thunderstorm WarningBROJim Hogg, Zapata49 min
May 11, 9:39 PM CDTSpecial Weather StatementBROZapata51 min
May 11, 9:48 PM CDTSevere Thunderstorm WarningBROZapata42 min
May 11, 9:54 PM CDTSevere Thunderstorm WarningBROBrooks, Jim Hogg51 min
May 11, 10:26 PM CDTSevere Thunderstorm WarningBROStarr, Zapata49 min
May 11, 10:45 PM CDTSpecial Weather StatementBROBrooks, Kenedy60 min
May 11, 11:04 PM CDTAreal Flood AdvisoryBROZapata4 hr
May 11, 11:14 PM CDTSevere Thunderstorm WarningBROStarr, Zapata46 min
May 11, 11:21 PM CDTAreal Flood AdvisoryBROJim Hogg, Starr, Zapata4 hr
May 11, 11:22 PM CDTAreal Flood AdvisoryBROJim Hogg, Zapata94 min
May 11, 11:51 PM CDTSpecial Weather StatementBROHidalgo, Kenedy, Starr54 min
May 11, 11:56 PM CDTSevere Thunderstorm WarningBROStarr36 min
May 12, 12:06 AM CDTAreal Flood AdvisoryBROStarr3 hr
May 12, 12:21 AM CDTAreal Flood AdvisoryBROBrooks, Hidalgo, Starr3 hr
May 12, 12:25 AM CDTAreal Flood AdvisoryBROStarr3 hr
May 12, 12:28 AM CDTSpecial Weather StatementBROHidalgo62 min
May 12, 12:38 AM CDTSpecial Weather StatementBROStarr52 min
May 12, 12:44 AM CDTSevere Thunderstorm WarningBROHidalgo, Willacy30 min
May 12, 12:50 AM CDTSpecial Weather StatementBROKenedy55 min
May 12, 1:00 AM CDTSevere Thunderstorm WarningBROKenedy60 min
May 12, 1:04 AM CDTSevere Thunderstorm WarningBROCameron, Hidalgo41 min
May 12, 1:12 AM CDTAreal Flood AdvisoryBROHidalgo, Starr3 hr
May 12, 1:12 AM CDTSpecial Marine WarningBRO48 min
May 12, 1:19 AM CDTAreal Flood AdvisoryBROHidalgo, Willacy3 hr
May 12, 1:34 AM CDTSpecial Marine WarningBRO26 min
May 12, 1:40 AM CDTSevere Thunderstorm WarningBROCameron49 min
May 12, 1:46 AM CDTAreal Flood AdvisoryBROCameron, Hidalgo3 hr
May 12, 1:50 AM CDTSevere Thunderstorm WarningBROHidalgo40 min
May 12, 1:53 AM CDTSpecial Marine WarningBRO22 min
May 12, 2:24 AM CDTAreal Flood AdvisoryBROCameron3 hr
May 12, 2:27 AM CDTSpecial Weather StatementBROCameron63 min
May 12, 2:39 AM CDTSpecial Marine WarningBRO41 min
May 12, 2:40 AM CDTSevere Thunderstorm WarningBROCameron34 min
May 12, 3:31 AM CDTSpecial Weather StatementBROCameron59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm warning in 2021

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.