Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 64, NWS Austin/San Antonio, TX

June 21, 1999Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jun 21, 1999, 3:20 PM CDT for Williamson 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
Jun 21, 1999, 3:20 PM CDT (20:20 UTC)
Expired
Jun 21, 1999, 5:30 PM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.3 hours before the alert went out and 245 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, Fort Worth, TX at 12:00Z on 1999-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 563 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, Fort Worth, TX at 12:00Z on 1999-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 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
563 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
808 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
8 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 KEWX 212023
FFWSAT
TXC491-212230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
320 PM CDT MON JUN 21 1999

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

* FLASH FLOOD WARNING FOR THE FOLLOWING...
  WILLIAMSON COUNTY IN TEXAS

* UNTIL 530 PM CDT

AT 320 PM DOPPLER RADAR INDICATED A BAND OF HEAVY RAINS OVER
PARTS OF WILLIAMSON COUNTY...MOVING NORTH AT 15 MPH.  NEW RAIN 
FORMATION WILL CONTINUE THE NEXT FEW HOURS.  THESE TYPE OF SHOWERS 
AND THUNDERSTORMS HAVE CAUSED 2 TO 2.3 INCH RAINS IN A SOME AREAS 
TODAY IN A SHORT PERIOD OF TIME...WITH UP TO NEAR 5.8 INCHES AT
ONE LOCATION IN COMAL COUNTY.  IN ADDITION...DANGEROUS LIGHTNING 
WILL OCCUR WITH THUNDERSTORMS.

THE WEATHER PATTERN BODES WELL FOR CONTINUED RAIN THE NEXT FEW
HOURS...CAUSING FLOODING AT LOW WATER CROSSINGS...LOW LYING AREAS 
AND OTHER FLOOD PRONE AREAS IN WILLIAMSON COUNTY.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!  IT CAN
BE DIFFICULT AT TIMES TO JUDGE DEPTH OF WATER AT FLOODED LOW
WATER CROSSINGS...AND FLOWING WATER CAN PUSH DESTROY AND STALL
VEHICLES IN LOW WATER CROSSINGS.  MOTORISTS SHOULD NOT DRIVE IN
FLOOD PRONE AREAS.

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...LOW WATER CROSSINGS AND UNDERPASSES.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS
AND STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLASH FLOORDING.

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.

In the hours before

Local storm report, Jun 21, 1:40 PM CDT, 1 hour 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
140 PM CDT MON JUN 21 1999

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

1230 PM                              TX   FLOODING
06/21/99  BEXAR                           KOA CAMPGROUND LOWER LEVELS
                                          FLOODED, SALADO CREEK
                                          FLOODING THE ACCESS ROADS
                                          AT I-35 AND LOOP 410

0120 PM                              TX   FLOODING
06/21/99  REAL                            FARM ROAD 337 CLOSED
                                          BETWEEN LEAKEY AND CAMP
                                          WOOD
0120 PM                              TX   FLOODING
06/21/99 UVALDE                           STATE HIGHWAY 55 CLOSED
                                          NORTH OF UVALDE
Local storm report, Jun 21, 1:40 PM CDT, 1 hour 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
140 PM CDT MON JUN 21 1999

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

1230 PM                              TX   FLOODING
06/21/99  BEXAR                           KOA CAMPGROUND LOWER LEVELS
                                          FLOODED, SALADO CREEK
                                          FLOODING THE ACCESS ROADS
                                          AT I-35 AND LOOP 410

0120 PM                              TX   FLOODING
06/21/99  REAL                            FARM ROAD 337 CLOSED
                                          BETWEEN LEAKEY AND CAMP
                                          WOOD
0120 PM                              TX   FLOODING
06/21/99 UVALDE                           STATE HIGHWAY 55 CLOSED
                                          NORTH OF UVALDE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 2:12 AM CDTFlash Flood WarningEWXVal Verde2 hr
Jun 21, 10:01 AM CDTFlash Flood WarningEWXBexar3 hr
Jun 21, 10:45 AM CDTFlash Flood WarningEWXWilson2 hr
Jun 21, 10:54 AM CDTFlash Flood WarningEWXBandera, Real2 hr
Jun 21, 11:35 AM CDTFlash Flood WarningEWXComal115 min
Jun 21, 12:19 PM CDTFlash Flood WarningEWXGuadalupe101 min
Jun 21, 1:11 PM CDTFlash Flood WarningEWXHays3 hr
Jun 21, 1:18 PM CDTFlash Flood WarningEWXComal, Guadalupe2 hr
Jun 21, 1:55 PM CDTFlash Flood WarningEWXCaldwell2 hr
Jun 21, 2:45 PM CDTFlash Flood WarningEWXCaldwell, Travis3 hr
Jun 21, 3:51 PM CDTFlash Flood WarningEWXMedina99 min
Jun 21, 5:20 PM CDTFlash Flood WarningEWXWilliamson70 min

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.