Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 105, NWS Austin/San Antonio, TX

July 4, 2002Bexar County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 4, 2002, 11:10 PM CDT for Bexar County, 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
Jul 4, 2002, 11:10 PM CDT (04:10 UTC)
Expired
Jul 5, 2002, 2:00 AM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 59 km from the middle of the area, began a volume at 04:10 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

Del Rio, TX (KDRT), launched 00:00Z, 4.2 hours before the alert went out and 221 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 00:00Z on 2002-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2373 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 00:00Z on 2002-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
2373 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1055 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
248 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KEWX 050410
FFWSAT
TXC029-050700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1110 PM CDT THU JUL 4 2002

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  BEXAR

* UNTIL 200 AM CDT

SHOWERS HAVE STARTED ENTERING THE SOUTHERN PART OF BEXAR COUNTY.  
WITH ADDITIONAL RAIN MOVING UP FROM THE SOUTH...AN INCH OF RAIN MAY 
OCCUR OVER THE NEXT FEW HOURS.  THIS WILL CAUSE RIVERS AND STREAMS 
TO REMAIN IN FLOOD MAINTAINING FLASH FLOOD CONDITIONS IN NUMEROUS 
LOCATIONS IN THE COUNTY.

THIS IS A DANGEROUS...LIFE THREATENING SITUATION.  IF YOU ARE NEAR 
STREAMS...RIVERS AND LOW LYING AREAS AS RAIN PASSES MOVE TO HIGHER 
GROUND IMMEDIATELY AS RUNOFF WILL BE RAPID.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.


LAT...LON 2933 9878 2917 9841 2945 9821 2969 9844
          2970 9875

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 11:36 PM CDTFlash Flood WarningEWXKendall3 hr
Jul 5, 12:30 AM CDTFlash Flood WarningEWXBlanco, Burnet, Comal4 hr
Jul 5, 12:35 AM CDTFlash Flood WarningEWXGillespie3 hr
Jul 5, 12:48 AM CDTFlash Flood WarningEWXWilson3 hr
Jul 5, 2:01 AM CDTFlash Flood WarningEWXBexar, Kendall, Llano119 min
Jul 5, 2:53 AM CDTFlash Flood WarningEWXBandera, Kerr, Medina4 hr
Jul 5, 3:00 AM CDTFlash Flood WarningEWXAtascosa, Karnes4 hr
Jul 5, 3:41 AM CDTFlash Flood WarningEWXBexar, Blanco, Burnet, Comal, Gillespie, Kendall and 2 more3 hr
Jul 5, 3:52 AM CDTFlash Flood WarningEWXHays3 hr
Jul 5, 3:54 AM CDTFlash Flood WarningEWXHays3 hr
Jul 5, 4:47 AM CDTFlash Flood WarningEWXGuadalupe, Real2 hr
Jul 5, 5:49 AM CDTFlash Flood WarningEWXCaldwell, Travis3 hr
Jul 5, 6:26 AM CDTFlash Flood WarningEWXAtascosa, Bandera, Bexar, Blanco, Burnet, Caldwell and 15 more6 hr
Jul 5, 7:53 AM CDTFlash Flood WarningEWXDimmit, Zavala4 hr
Jul 5, 11:47 AM CDTFlash Flood WarningEWXAtascosa, Bandera, Bexar, Blanco, Burnet, Caldwell and 18 more4 hr
Jul 5, 3:31 PM CDTFlash Flood WarningEWXAtascosa, Bandera, Bexar, Blanco, Burnet, Caldwell and 17 more4 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.