Alert archive / Texas / Flash Flood Warnings in 2008

Flash Flood Warning 21, NWS Corpus Christi, TX

August 23, 2008La Salle County, Texas

NWS Corpus Christi, TX issued this flash flood warning at Aug 23, 2008, 2:15 PM CDT for La Salle County, Texas. It was in force for 90 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
Aug 23, 2008, 2:15 PM CDT (19:15 UTC)
Expired
Aug 23, 2008, 3:45 PM CDT
In force
90 min
Issued by
NWS Corpus Christi, TX
Area
Storm-based polygon
Flood severity
None

County La Salle County, TX

The radar

The Corpus Christi radar (KCRP), 152 km from the middle of the area, began a volume at 19:16 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, 7.3 hours before the alert went out and 170 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, Corpus Christi, TX at 12:00Z on 2008-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1884 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, Corpus Christi, TX at 12:00Z on 2008-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
1884 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
721 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
19 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 KCRP 231915
FFWCRP
TXC283-232045-
/O.NEW.KCRP.FF.W.0021.080823T1915Z-080823T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
215 PM CDT SAT AUG 23 2008

THE NATIONAL WEATHER SERVICE IN CORPUS CHRISTI HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN LA SALLE COUNTY IN SOUTH TEXAS

* UNTIL 345 PM CDT

* AT 203 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.     
  DOPPLER RADAR ESTIMATED RAINFALL RATES OF 2 TO 4 INCHES PER HOUR
  ALONG PORTIONS OF FARM-TO-MARKET ROAD 624 SOUTHEAST OF COTULLA.

* SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
  WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE
  FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING    
  INCLUDE...FARM-TO-MARKET ROAD 624...HERRADURA LODGE...AND          
  KENLEY RANCH. 

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 2839 9883 2807 9881 2805 9918 2839 9919

$$

87
1 follow-up statement
000 
WGUS74 KCRP 232044
FFSCRP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
344 PM CDT SAT AUG 23 2008

TXC283-232053-
/O.EXP.KCRP.FF.W.0021.000000T0000Z-080823T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA SALLE-
344 PM CDT SAT AUG 23 2008

...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM CDT FOR SOUTHEASTERN
LA SALLE COUNTY...

THE STORMS THAT WERE PRODUCING HEAVY RAIN...HAVE MARKEDLY WEAKENED. 
HENCE THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM FOR SOUTHEASTERN 
LA SALLE COUNTY. 

LAT...LON 2839 9883 2807 9881 2805 9918 2839 9919

$$

SCC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 10:11 PM CDTFlood WatchCRPLa Salle, Webb19 hr
Aug 23, 7:21 AM CDTFlash Flood WarningCRPWebb114 min
Aug 23, 10:02 AM CDTAreal Flood AdvisoryCRPWebb118 min
Aug 23, 11:51 AM CDTFlash Flood WarningCRPWebb54 min
Aug 23, 1:57 PM CDTFlash Flood WarningCRPWebb93 min
Aug 23, 2:56 PM CDTFlash Flood WarningCRPDuval79 min
Aug 23, 3:22 PM CDTSevere Thunderstorm WarningCRPSan Patricio33 min
Aug 23, 4:00 PM CDTFlash Flood WarningCRPSan Patricio90 min
Aug 23, 5:09 PM CDTFlood WatchCRPLa Salle, Webb17 hr

Nearby

Flash Flood Warnings in Texas, 2008Every flash flood warning in 2008

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.