Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Brownsville, TX

October 9, 2011Jim Hogg County, Zapata County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Oct 9, 2011, 12:45 PM CDT for Jim Hogg County, Zapata County, Texas. It was in force for 30 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: Oct 9, 2011, 12:45 PM CDT (17:45 UTC)
Expired: Oct 9, 2011, 1:15 PM CDT
In force: 30 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon

Counties Jim Hogg County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 149 km from the middle of the area, began a volume at 17:45 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, 5.8 hours before the alert went out and 162 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: 2278 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

546 
WUUS54 KBRO 091745
SVRBRO
TXC247-505-091845-
/O.NEW.KBRO.SV.W.0021.111009T1745Z-111009T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
1245 PM CDT SUN OCT 9 2011

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN JIM HOGG COUNTY IN DEEP SOUTH TEXAS.
  NORTHEASTERN ZAPATA COUNTY IN DEEP SOUTH TEXAS.

* UNTIL 145 PM CDT

* AT 1245 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING DAMAGING 60 MPH WINDS...
  15 MILES EAST OF BUSTAMANTE...MOVING SOUTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ESCOBA BY 1245 PM CDT.
  RANDADO BY 1250 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE
INDOORS IMMEDIATELY. DO NOT USE ELECTRICAL APPLIANCES OR TELEPHONES.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. MOVE TO A PLACE OF SAFETY...AN INTERIOR ROOM IN THE LOWEST
FLOOR OF YOUR HOUSE OR BUSINESS.

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.

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 2723 9857 2691 9878 2701 9920 2728 9902
      2728 9893
TIME...MOT...LOC 1745Z 294DEG 10KT 2707 9888

$$

61

1 follow-up statement

961 
WWUS54 KBRO 091815
SVSBRO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
115 PM CDT SUN OCT 9 2011

TXC247-505-091825-
/O.CAN.KBRO.SV.W.0021.000000T0000Z-111009T1845Z/
JIM HOGG-ZAPATA-
115 PM CDT SUN OCT 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ZAPATA AND
WESTERN JIM HOGG COUNTIES IS CANCELLED...

AT 115 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE
THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO LONGER
SEVERE...THUS THE WARNING HAS BEEN CANCELLED.

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


LAT...LON 2723 9857 2691 9878 2701 9920 2728 9902
      2728 9893
TIME...MOT...LOC 1815Z 294DEG 10KT 2704 9879

$$

64

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 1:03 PM CDT	Areal Flood Advisory	BRO	Jim Hogg, Zapata	117 min
Oct 9, 2:10 PM CDT	Special Marine Warning	BRO		2 hr
Oct 9, 2:45 PM CDT	Severe Thunderstorm Warning	BRO	Kenedy, Willacy	30 min
Oct 9, 3:11 PM CDT	Tornado Warning	BRO	Kenedy, Willacy	34 min
Oct 9, 3:33 PM CDT	Special Marine Warning	BRO		117 min
Oct 9, 3:38 PM CDT	Areal Flood Advisory	BRO	Kenedy, Willacy	97 min
Oct 9, 4:11 PM CDT	Special Marine Warning	BRO		3 hr
Oct 9, 5:33 PM CDT	Special Marine Warning	BRO		117 min

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.