Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 42, NWS Brownsville, TX

October 24, 2002Cameron County, Texas

NWS Brownsville, TX issued this flash flood warning at Oct 24, 2002, 10:05 PM CDT for Cameron County, Texas. It was in force for 115 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 24, 2002, 10:05 PM CDT (03:05 UTC)
Expired
Oct 25, 2002, 12:00 AM CDT
In force
115 min
Issued by
NWS Brownsville, TX
Area
Counties, with a storm outline in the text

County Cameron County, TX

The radar

The Brownsville radar (KBRO), 31 km from the middle of the area, began a volume at 03:06 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 3.1 hours before the alert went out and 33 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 2002-10-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1499 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 2002-10-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
1499 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
832 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.3

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KBRO 250305
FFWBRO
TXC061-250500-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
1002 PM CDT THU OCT 24 2002

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CAMERON COUNTY IN DEEP SOUTH TEXAS

* UNTIL MIDNIGHT CDT

* AT 950 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY 
  HEAVY RAINFALL ALONG A LINE EXTENDING FROM LAGUNA VISTA TO
  RANCHO VIEJO...MOVING EAST AT 10 MPH. 

* SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
  WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
  FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH   
  FLOODING INCLUDE...BROWNSVILLE...SAN BENITO...HARLINGEN...RIO 
  HONDO...RANCHO   VIEJO...LOS FRESNOS AND COMBES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. 
MOVE TO HIGHER GROUND.

LAT...LON 2634 9786 2608 9785 2605 9768 2595 9756
          2588 9743 2607 9726 2613 9736 2636 9743
          2629 9753

$$

KNUTSVIG

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 Oct 24, 8:55 PM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Oct 24, 8:55 PM CDT, 1 hour 10 minutes before
DEEP SOUTH TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
855 PM CDT THU OCT 24 2002

UPDATES HAVE BEEN ISSUED TO INCLUDE A FLASH FLOOD WATCH FOR ALL
COUNTIES. AN UPDATE WILL BE ISSUED FOR MINOR PRECIP. CHANGES.  AS
THE STORMS EXIT THE EASTERN CWA...REDEVELOPMENT CONTINUES IN
SOUTHERN HIDALGO COUNTY AND ON THE MEXICAN SIDE OF HIDALGO COUNTY.
A SECOND LINE OF STORMS MAY TRAVERSE CAMERON COUNTY.

SYNOPTIC...KNUTSVIG
AVIATION/MESO/MARINE...MILLER

INTERNET ADDRESS...WWW.SRH.NOAA.GOV/BRO

.BRO...FFA TONIGHT AND FRIDAY...TXZ248>257.
Hazardous weather outlook, Oct 24, 7:10 PM CDT, 2 hours 55 minutes before
TXZ248>257-251100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BROWNSVILLE TX
710 PM CDT THU OCT 24 2002

THIS HAZARDOUS WEATHER OUTLOOK IS FOR DEEP SOUTH TEXAS.

.DAY ONE...

SCATTERED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED THROUGHOUT THE
REGION THROUGH FRIDAY MORNING. MANY OF THESE SHOWERS ARE EXPECTED TO
PRODUCE VERY HEAVY RAIN AND POSSIBLE FLASH FLOODING.

THUS...A FLASH FLOOD WATCH HAS BEEN ISSUED FOR ALL OF DEEP SOUTH
TEXAS THROUGH FRIDAY MORNING. FOR FURTHER DETAILS ON THIS HAZARDOUS
WEATHER SITUATION...PLEASE REFER TO THE FLASH FLOOD WATCH ISSUED BY
THIS OFFICE AT 708 PM CDT.

OTHERWISE...THESE THUNDERSTORMS MAY PRODUCE ISOLATED INSTANCES OF
DAMAGING WINDS AND HAIL.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED TONIGHT OVER ALL OF DEEP SOUTH
TEXAS. EMERGENCY MANAGERS ARE ASKED TO MONITOR WEATHER CONDITIONS
CLOSELY.

.DAYS TWO THROUGH SEVEN...

A COLD FRONT WILL APPROACH FROM THE NORTH LATE SATURDAY...WHILE
TROPICAL MOISTURE MOVES IN FROM THE SOUTHWEST. THIS WILL GENERATE
SCATTERED SHOWERS AND THUNDERSTORMS. SOME OF THE STRONGER STORMS MAY
PRODUCE LOCALLY HEAVY RAIN. AREAS THAT HAVE BEEN RECENTLY AFFECTED
BY HEAVY RAINS WILL BE MORE SUSCEPTIBLE TO FLASH FLOODING.

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 24, 7:01 PM CDTSevere Thunderstorm WarningBROCameron67 days
Oct 24, 7:20 PM CDTSpecial Marine WarningBRO55 min
Oct 24, 7:20 PM CDTSpecial Marine WarningBRO55 min
Oct 24, 7:57 PM CDTFlash Flood WarningBROCameron2 hr
Oct 24, 8:19 PM CDTFlash Flood WarningBROKenedy41 min
Oct 24, 8:20 PM CDTSpecial Marine WarningBRO55 min
Oct 24, 9:18 PM CDTSpecial Marine WarningBRO27 min
Oct 24, 9:18 PM CDTSpecial Marine WarningBRO57 min
Oct 24, 9:18 PM CDTSpecial Marine WarningBRO57 min
Oct 24, 9:18 PM CDTSpecial Marine WarningBRO27 min
Oct 25, 12:12 AM CDTFlash Flood WarningBROCameron3 hr
Oct 25, 2:59 AM CDTSpecial Marine WarningBRO61 min
Oct 25, 9:56 AM CDTSpecial Marine WarningBRO3 hr

Nearby

Flash Flood Warnings in Texas, 2002Every flash flood warning in 2002

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.