Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 90, NWS Austin/San Antonio, TX

July 11, 1999Bexar County, Comal County, Kendall County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 11, 1999, 6:47 PM CDT for Bexar County, Comal County, Kendall 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
Jul 11, 1999, 6:47 PM CDT (23:47 UTC)
Expired
Jul 11, 1999, 9:10 PM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Bexar County, TX, Comal County, TX, Kendall County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.8 hours before the alert went out and 230 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, Del Rio, TX at 12:00Z on 1999-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 129 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 1999-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 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
129 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-9 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 KSAT 112348
FFWSAT
TXC019-029-091-259-325-385-463-120210-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
647 PM CDT SUN JUL 11 1999

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  REAL COUNTY IN TEXAS
  KENDALL COUNTY IN TEXAS
  BANDERA COUNTY IN TEXAS
  COMAL COUNTY IN TEXAS
  UVALDE COUNTY IN TEXAS
  MEDINA COUNTY IN TEXAS
  BEXAR COUNTY IN TEXAS...INCLUDING SAN ANTONIO METROPOLITAN AREA

* UNTIL 910 PM CDT.

* AT 630 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN BETWEEN UVALDE AND
  NEW BRAUNFELS...MOVING NORTH AT 15 MPH.

* RAINFALL RATES OF OVER AN INCH AN HOUR ARE IN THIS LINE OF STORMS.
  DUE TO THE GROUND BEING SATURATED FROM PRIOR RAINS...THIS RAIN
  WILL NOT SOAK IN BUT RUN OFF RAPIDLY INTO ALREADY SWOLLEN OR
  FLOODED CREEKS...LOW-WATER CROSSINGS...UNDERPASSES...STREETS AND
  HIGHWAYS...OR POND IN LOW-LYING AREAS...GREATLY ADDING TO THE
  THREAT FOR FLASH FLOODING.  RAIN TOTALS COULD AMOUNT TO SEVERAL
  INCHES OR MORE BEFORE THE LINE OF STORMS PASS OVER AN AREA.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!  MOTIRISTS
SHOULD NOT ATTEMPT TO DRIVE AROUND BARRICADED STREETS...ROADS OR
LOW-WATER CROSSINGS.  CHILDREN SHOULD BE KEPT AWAY FROM FLOOD
DRAINAGE DITCHES...CREEKS AND STORM DRAINS.  HIKERS AND CAMPERS
SHOULD BE PREPARED TO MOVE TO HIGHER GROUND AND AWAY FROM THE
FLOOD PLAIN OF FLOOD-PRONE CREEKS AND RIVERS.

IN ADDITION...GUSTY WINDS AND FREQUENT DEADLY LIGHTNING ACCOMPANY
THIS LINE OF THUNDERSTORMS...SO BE PREPARED TO MOVE INDOORS TO A
PLACE OF SAFETY IF THUNDER IS HEARD OR LIGHTNING SEEN.

ADDITIONAL STATEMENTS OR WARNINGS WILL BE ISSUED AS CONDITIONS
WARRANT.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 10, 10:45 PM CDTFlash Flood WarningEWXBandera2 hr
Jul 11, 3:30 AM CDTFlash Flood WarningEWXMedina, Uvalde4 hr
Jul 11, 7:15 AM CDTFlash Flood WarningEWXBandera, Medina, Uvalde5 hr
Jul 11, 8:00 AM CDTFlash Flood WarningEWXVal Verde4 hr
Jul 11, 8:31 AM CDTFlash Flood WarningEWXKendall3 hr
Jul 11, 11:50 AM CDTFlash Flood WarningEWXVal Verde3 hr
Jul 11, 3:20 PM CDTFlash Flood WarningEWXLee100 min
Jul 11, 6:10 PM CDTFlash Flood WarningEWXKarnes110 min
Jul 11, 6:47 PM CDTFlash Flood WarningEWXBandera, Real, Uvalde2 hr
Jul 11, 6:47 PM CDTFlash Flood WarningEWXMedina2 hr

Nearby

Flash Flood Warnings in Texas, 1999Every flash flood warning in 1999

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.