Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Brownsville, TX

May 20, 2011Brooks County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at May 20, 2011, 6:14 PM CDT for Brooks County, Texas. It was in force for 61 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 20, 2011, 6:14 PM CDT (23:14 UTC)
Expired: May 20, 2011, 7:15 PM CDT
In force: 61 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon

County Brooks County, TX

The radar

The Corpus Christi radar (KCRP), 118 km from the middle of the area, began a volume at 23:16 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

Corpus Christi, TX (KCRP), launched 12:00Z, 11.2 hours before the alert went out and 126 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3928 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

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

330 
WUUS54 KBRO 202314
SVRBRO
TXC047-210015-
/O.NEW.KBRO.SV.W.0013.110520T2314Z-110521T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
614 PM CDT FRI MAY 20 2011

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BROOKS COUNTY IN DEEP SOUTH TEXAS.

* UNTIL 715 PM CDT

* AT 614 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL AND
  DAMAGING 60 MPH WINDS...OVER CENTRAL BROOKS COUNTY...MOVING
  NORTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL CENTRAL BROOKS COUNTY BY 615 PM CDT.

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.

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 2708 9832 2701 9808 2682 9832 2691 9841
TIME...MOT...LOC 2314Z 238DEG 8KT 2694 9823

$$

61

1 follow-up statement

529 
WWUS54 KBRO 202335
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
635 PM CDT FRI MAY 20 2011

TXC047-210015-
/O.CON.KBRO.SV.W.0013.000000T0000Z-110521T0015Z/
BROOKS-
635 PM CDT FRI MAY 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR CENTRAL BROOKS COUNTY...

AT 635 PM CDT NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM 18 MILES EAST OF AGUA NUEVA...MOVING
NORTHWEST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL CENTRAL BROOKS COUNTY BY 635 PM CDT.

THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING...
  QUARTER SIZE HAIL.
  60 MPH WIND GUSTS.
  EXCESSIVE AND DEADLY CLOUD-TO-GROUND LIGHTNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AVOID USING THE TELEPHONE OR OTHER ELECTRICAL EQUIPMENT WHILE
LIGHTNING IS IN THE AREA.

LEAVE MOBILE HOMES FOR A STURDY BUILDING. IF OUTSIDE AND THERE IS NO
STURDY BUILDING NEARBY...MOVE TO A DITCH OR LOW SPOT...BUT WATCH FOR
RISING WATERS.

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 2694 9839 2701 9835 2704 9830 2692 9820
      2683 9830 2682 9832 2684 9834
TIME...MOT...LOC 2335Z 155DEG 6KT 2692 9832

$$

61

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 9:09 AM CDT	Small Craft Advisory for Winds	BRO		10 hr
May 20, 6:01 PM CDT	Areal Flood Advisory	BRO	Brooks, Hidalgo, Jim Hogg, Starr	59 min
May 20, 6:40 PM CDT	Severe Thunderstorm Warning	BRO	Brooks	45 min
May 20, 6:54 PM CDT	Areal Flood Advisory	BRO	Brooks, Jim Hogg	2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2011 Every severe thunderstorm warning in 2011

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.