Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 17, NWS Brownsville, TX

September 4, 2001Hidalgo County, Texas

NWS Brownsville, TX issued this flash flood warning at Sep 4, 2001, 7:20 PM CDT for Hidalgo County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Sep 4, 2001, 7:20 PM CDT (00:20 UTC)
Expired
Sep 4, 2001, 10:00 PM CDT
In force
3 hr
Issued by
NWS Brownsville, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Hidalgo County, TX

The radar

The Brownsville radar (KBRO), 109 km from the middle of the area, began a volume at 00:23 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

Brownsville Intl, TX (KBRO), launched 00:00Z, 0.3 hours before the alert went out and 112 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 2001-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2105 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brownsville Intl, TX at 00:00Z on 2001-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.1939Sfc1 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
2105 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
978 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KBRO 050020
FFWBRO
FFWBRO
TXC215-050300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
720 PM CDT TUE SEP 4 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN HIDALGO COUNTY IN DEEP SOUTH TEXAS

* UNTIL 1000 PM CDT

* AT 715 PM CDT...HEAVY RAINFALL FROM THUNDERSTORMS THAT MOVED       
  THROUGH EASTERN PORTIONS OF STARR COUNTY...INTO WESTERN 
  PORTIONS OF HIDALGO COUNTY EARLIER THIS AFTERNOON...CONTINUES      
  TO RUNOFF POSING A THREAT OF FLASH FLOODING OVER EXTREME           
  SOUTHWESTERN HIDALGO COUNTY...INCLUDING THE TOWNS OF LA JOYA AND   
  HAVANA.

SOME OF THIS RUNOFF WILL ALSO FLOW INTO LAKE LA JOYA WHICH COULD 
AGGRAVATE FLOODING PROBLEMS IN THE CITY OF LA JOYA. IN 
ADDITION...RUNOFF INTO THE STREAMS AND TRIBUTARIES WILL CAUSE 
FLOODING OF SOME COUNTY ROADS.

THE RED CROSS HAS OPENED A SHELTER AT LA JOYA HIGH SCHOOL. 

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

LAT...LON 2643 9847 2629 9856 2613 9823 2648 9826

CASTILLO

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Brownsville, TX wrote its last area forecast discussion before this flash flood warning went out at Sep 4, 4:05 PM CDT, 3 hours 15 minutes earlier.

Area forecast discussion, Sep 4, 4:05 PM CDT, 3 hours 15 minutes before
DEEP SOUTH TEXAS FORECAST DISCUSSION...AMENDMENT TO CCF
NATIONAL WEATHER SERVICE BROWNSVILLE TX
405 PM CDT TUE SEP 4 2001

SHORT TERM...CONVECTION DEVELOPING ALONG OUTFLOW BOUNDARY OVER
NORTHWEST PORTIONS OF DEEP SOUTH TEXAS THIS AFTERNOON. WATER VAPOR
IMAGES AND RUC GUIDANCE CONTINUES TO INDICATE VORT MAX MOVING DOWN
THE RIO GRANDE INTO WESTERN PORTIONS OF THE CWA. UNSTABLE LIFTING
INDEXES AND CAPE VALUES INDICATE POTENTIAL FOR ADDITIONAL
DEVELOPMENT AS LINE OF CONVECTION CONTINUES TO DEVELOP THIS
AFTERNOON. IN ADDITION...LEFT ENTRANCE OF UPPER LEVEL JET OVER
SOUTHWEST UNITED STATES PROVIDING SOME DIFFLUENCE ALOFT. SOME
DIRECTIONAL SHEAR AND VEERING WITH HEIGHT EVEN THOUGH 700MB WINDS A
LITTLE OUT OF PHASE. DRIER AIR AT 700MB TO PROVIDE MARGINAL WIND AND
HAIL THREAT. GREATEST THREAT REMAINS HEAVY RAINFALL AND FLOODING
POTENTIAL WITH SLOW MOVEMENT OF CONVECTION. WILL EXTEND FLASH FLOOD
WATCH FOR ENTIRE CWA. UPPER LEVEL LOW OVER NORTH TEXAS TO MOVE
LITTLE WEDNESDAY AND OPENS UP AS SHORT WAVE THURSDAY. BELIEVE
GREATEST THREAT OF WIDESPREAD RAIN TONIGHT INTO WEDNESDAY
MORNING...WITH A DECREASING CHANCE OF SHOWERS AND TSTMS THURSDAY AS
DRYING IN THE MID TO UPPER LEVELS MOVES INTO DEEP SOUTH
TX.

EXTENDED...A CHANGE IN THE PATTERN AS UPPER LOW/TROUGH DROPS INTO
THE CENTRAL ROCKY MOUNTAINS FRIDAY NORTH OF FOUR CORNERS REGION.
SURFACE LOW PRESSURE TO DEVELOP OVER WEST TEXAS WITH PRESSURE
GRADIENT INCREASING OVER SOUTH TX SATURDAY. BULK OF PRECIP TO BE FAR
TO THE NORTH WHERE DYNAMICS LOCATED WITH UPPER LOW POISED JUST
NORTHWEST OF TX PANHANDLE SUNDAY. LACK OF A SURFACE BOUNDARY FOR
CONVERGENCE WILL LIMIT RAIN CHANCES THROUGH THE PERIOD.

MARINE...SEAS 3 FEET OFFSHORE WITH SOUTH WINDS NEAR 15 KNOTS. NO
CONVECTION OFFSHORE BUT LINE OF CONVECTION REACHING NORTHEAST
PORTIONS OF DEEP SOUTH TX TO REACH NORTHERN PORTIONS OF COASTAL
WATERS LATER THIS AFTERNOON. CONVECTIVE TRENDS SHOULD DIMINISH AS
THE UPPER LOW OVER TX LIFTS OUT AND A TROUGH MOVES INTO THE FOUR
CORNERS REGION OF THE U.S. TOWARDS THE END OF THE WEEK. LOW PRESSURE
DEVELOPING OVER WEST TEXAS WILL INCREASE THE PRESSURE GRADIENT OVER
THE LOWER TX COAST FRIDAY.

PRELIMINARY NUMBERS...
BRO TB 077/094 076/094 077 65432
HRL TB 076/095 075/095 076 65432
MFE TB 077/096 076/096 077 65432
RGC TB 076/098 075/098 076 65432
SPI TB 078/088 077/088 078 65432

AVIATION-MARINE-MESO...YURA.69/SYNOPTIC-PUBLIC...CASTILLO.61
MESO...MCGUIRE.55
SWC...CAMPBELL

.BRO...FFA TXZ248>257.

Nearby

Flash Flood Warnings in Texas, 2001Every flash flood warning in 2001

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.