Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 219, NWS Austin/San Antonio, TX

September 9, 20026 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Sep 9, 2002, 8:48 AM CDT for 6 counties in Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 9, 2002, 8:48 AM CDT (13:48 UTC)
Expired
Sep 9, 2002, 11:45 AM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

Counties Atascosa County, TX, Bexar County, TX, Frio County, TX, Karnes County, TX, Medina County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 81 km from the middle of the area, began a volume at 13:52 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, 1.8 hours before the alert went out and 202 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 2002-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2864 joules per kilogram.LCLEL10008507005003002001001 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 2002-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
2864 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
543 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
49 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 KEWX 091348
FFWSAT
TXC013-029-163-255-325-493-091645-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
850 AM CDT MON SEP 9 2002

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  BEXAR
  MEDINA
  WILSON
  ATASCOSA
  KARNES
  FRIO

* UNTIL 1145 AM CDT

* AT 845 AM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  FROM KARNES AND ATASCOSA COUNTIES INTO SOUTHWEST BEXAR INTO MEDINA 
  COUNTIES.  HEAVY RAIN WAS ALSO MOVING INTO EXTREME SOUTHERN WILSON 
  COUNTY NEAR DEWEES.  

SHOWERS AND THUNDERSTORMS WITH HEAVY RAINFALL RATES OF UP TO 2 TO 4 
INCHES PER HOUR CAN BE EXPECTED AS VERY HEAVY RAINS MOVE NORTH AND 
NORTHWEST AT NEAR 10 MPH ACROSS THE AREA.   STREETS...SECONDARY 
ROADS...AND LOW WATER  CROSSINGS ACROSS THE COUNTIES WILL BE VERY 
DANGEROUS THE NEXT FEW HOURS.  MOTORISTS SHOULD AVOID TRAVEL IF 
POSSIBLE...AND UNDER NO CIRCUMSTANCES ENTER FLOODED STREETS AND 
CROSSINGS.  AUTOS ARE VERY VULNERABLE TO FAST MOVING WATER. 

LAT...LON 2961 9941 2867 9938 2868 9823 2883 9767
          2921 9796 2930 9824 2948 9849
2 follow-up statements
000 
WGUS74 KEWX 091615
FFSSAT
TXC029-091800-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1115 AM CDT MON SEP 9 2002

...A FLASH FLOOD WARNING CONTINUES FOR BEXAR COUNTY UNTIL 1145 AM... 
...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH 6 PM...

HEAVY RAINS OF 2 TO 4 INCHES OVER SOUTHERN BEXAR COUNTY AND PARTS OF 
SAN ANTONIO OVER THE PAST SEVERAL HOURS WILL PROBABLY PUT LEON CREEK 
IN FLOOD AND POSSIBLY OVER THE WESTOVER DRIVE BRIDGE ACROSS KELLY 
USA.  LEON CREEK WILL LIKELY REMAIN IN FLOOD THROUGH MUCH OF THE DAY 
AS HEAVY RAINS CONTINUE TO TRAIN INTO AND ACROSS SOUTH CENTRAL TEXAS.
THE FLASH FLOOD WARNING FOR BEXAR COUNTY WILL BE EXTENDED INTO THE 
AFTERNOON HOURS. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND. STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST
WEATHER INFORMATION.
000 
WGUS74 KEWX 091646
FFSSAT
TXC013-163-325-091715-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1146 AM CDT MON SEP 9 2002

...THE FLASH FLOOD WARNING FOR MEDINA...ATASCOSA AND FRIO COUNTIES
HAS EXPIRED...

NATIONAL WEATHER SERVICE RADAR INDICATED THE HEAVY RAINFALL WAS 
ENDING AND THE FLOOD THREAT WAS DIMINISHING.  HOWEVER LIGHT TO 
MODERATE RAINFALL WILL CONTINUE FOR THE NEXT HOUR.  SOME MINOR 
FLOODING MAY CONTINUE...BUT THE THREAT OF SERIOUS FLOODING HAS ENDED 
AND THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST WEATHER INFORMATION.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 7:25 PM CDTFlash Flood WarningEWXMedina3 hr
Sep 8, 8:57 PM CDTFlash Flood WarningEWXAtascosa, Frio, Medina4 hr
Sep 9, 12:25 AM CDTFlash Flood WarningEWXAtascosa, Frio, Medina6 hr
Sep 9, 5:45 AM CDTFlash Flood WarningEWXFrio3 hr
Sep 9, 6:01 AM CDTFlash Flood WarningEWXAtascosa, Bexar3 hr
Sep 9, 11:16 AM CDTFlash Flood WarningEWXDeWitt4 hr
Sep 9, 11:48 AM CDTFlash Flood WarningEWXBandera, Bexar, Comal, Gonzales, Guadalupe, Kendall and 1 more3 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.