Alert archive / Texas / Flash Flood Warnings in 1996

Flash Flood Warning 9, NWS Corpus Christi, TX

August 30, 1996Webb County, Texas

NWS Corpus Christi, TX issued this flash flood warning at Aug 30, 1996, 9:30 AM CDT for Webb County, Texas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 30, 1996, 9:30 AM CDT (14:30 UTC)
Expired: Aug 30, 1996, 11:30 AM CDT
In force: 2 hr
Issued by: NWS Corpus Christi, TX
Area: Whole counties

County Webb County, TX

The radar

The Corpus Christi radar (KCRP), 179 km from the middle of the area, began a volume at 14:29 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, 2.5 hours before the alert went out and 196 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: 2664 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 570 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 40 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 
TTAA00 KCRP 301429
FFWCRP
TXC479-301630-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
930 AM CDT FRI AUG 30 1996

THE NATIONAL WEATHER SERVICE IN CORPUS CHRISTI HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1130 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY......

IN SOUTH CENTRAL TEXAS

   ...WEBB COUNTY

AT 925 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA
OF HEAVY RAINFALL AND THUNDERSTORMS LOCATED OVER MUCH OF WEBB
COUNTY. LOCAL FLOODING IS LIKELY ACROSS THE GREATER LAREDO METROPOLITAN
AREA AS RAINFALL TOTALS OF 3 TO 4 INCHES AN HOUR CAN BE EXPECTED.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

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 Corpus Christi, TX wrote its last area forecast discussion before this flash flood warning went out at Aug 30, 2:19 AM CDT, 7 hours 11 minutes earlier.

Area forecast discussion, Aug 30, 2:19 AM CDT, 7 hours 11 minutes before

COASTAL BEND FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
220 AM CDT FRI AUG 30 1996

DISCUSSION...FFA CONTINUES IN EFFECT FOR THE NRN PORTIONS OF THE CWA
ATTM AND CURRENT AREAL CONFIGURATION IN PHASE WITH KCRP-88D DATA.
CURRENT RAFL ACTIVITY EXTENDS FROM COTULLA TO THREE RIVERS TO VCT AND
NWD WITH AN EWD COMPONENT OF PROPAGATION NOTED.  CURRENT VILS OF 30
KG/M2 COMBINED WITH ET HEIGHTS AOA 45K FT YIELD A VIL DENSITY < 3.0
ATTM...HVY RAFL IS THE MAIN THREAT.  ACTIVITY CONFINED TO THE CURRENT
FFA OUTLINE AND SEE LITTLE REASON FOR ANY SWD EXTENSION FOR THE
UPCOMING PACKAGE.  AFTER COORDINATION WITH WFO EWX WL MONITOR AREAL
COVERAGE/MOVEMENT CAREFULLY AS WL 2ND SHIFT FOR ANY ADDITIONAL AREAS
OF CWA NEEDED TO BE INCLUDED TO FFA.

00Z CRP SOUNDING SIMILAR TO 12Z WITH K-INDEX OF 30 AND PW VALUE OF
2.01 INCHES.  B+ HAS INCREASED FROM 3012 TO 4004 J/KG.  H5 TROF AXIS
PUSHES S AND SEWD WITH TIME AS CLOSED H5 HEIGHT CENTER EVOLVES OVR E
TX BY 12Z SAT WITH ASSOCIATED TROF EXTENSION ACROSS THE FA.  TIME
CROSS-SECTIONS REVEAL GREATEST VERTICAL MOTION/THETA-E ADVECTION
VALUES THROUGH 36 HRS WITH ABUNDANT LOW-MID LEVEL MOISTURE AS ENTIRE
REGION EXISTS BENEATH A DIVERGENT H2 RRQ JET STREAK ENHANCING QPF
TOTALS ACROSS THE REGION.

OTRW...URBAN/SMALL STREAM FLOOD ADVISORY WBIS FOR LASALLE CO AS HVY
RAINS CONTINUE WITH OHP TOTALS IN EXCESS OF 2.5 IN/HR AND THP
ISOLATED MAX OF 6 INCHES!

CRP WE 089/072 089/074 090 764
VCT WE 086/073 086/074 089 875
LRD WE 092/074 092/075 094 664

BML...76

In the hours before

Local storm report, Aug 30, 8:07 AM CDT, 1 hour 23 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
800 AM CDT FRI AUG 30 1996

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

345 AM     5 N COTULLA               TX   FLOODING
08/30/96   LASALLE                        4 TO 6 INCHES OF WATER
                                          OVER LOCAL ACCESS ROADS
                                          HIGHWAY 81 NEAR COTULLA.

745 AM     LAREDO  j                  TX   FLOODING
08/30/96   WEBB                           3 TO 5 INCHES OF WATER
                                          FLOODED I.H. 35 AND
                                          HIGHWAY 59E NEAR LAREDO.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 3:34 AM CDT	Flash Flood Warning	CRP	La Salle	116 min
Aug 30, 7:26 AM CDT	Flash Flood Warning	CRP	Webb	2 hr

Nearby

Flash Flood Warnings in Texas, 1996 Every flash flood warning in 1996

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.