Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 372, NWS Austin/San Antonio, TX

July 23, 2007Bexar County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 23, 2007, 4:56 PM CDT for Bexar 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 23, 2007, 4:56 PM CDT (21:56 UTC)
Expired
Jul 23, 2007, 7:00 PM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 55 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 223 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 2007-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 860 joules per kilogram.LCLLFCEL10008507005003002001001 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 2007-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
860 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1098 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 232157
FFWEWX
TXC029-240000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
456 PM CDT MON JUL 23 2007

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BEXAR COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 700 PM CDT

* AT 454 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETERMINED THAT
  RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE FLASH FLOODING FROM 
  A THUNDERSTORM OVER THE WARNED AREA. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE
  DOMINION...LEON SPRINGS AND CROSS MOUNTAIN

RAINFALL AMOUNTS WILL AVERAGE 1 TO 2 INCHES PER HOUR.

WHEN WATER COVERS THE ROAD...TURN AROUND DONT DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE THROUGH FLOODED
AREAS...ESPECIALLY AT NIGHT. STAY TUNED TO NOAA WEATHER RADIO OR
LOCAL NEWS MEDIA FOR THE LATEST FLOOD INFORMATION.

LAT...LON 2963 9858 2972 9876 2944 9877 2940 9854

$$
1 follow-up statement
000 
WGUS74 KEWX 232330
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
627 PM CDT MON JUL 23 2007

TXC029-240000-
BEXAR TX-
627 PM CDT MON JUL 23 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR BEXAR
COUNTY...

AT 624 PM CDT...DOPPLER RADAR INDICATED NO HEAVY RAINS IN BEXAR 
COUNTY...BUT ADDITIONAL THUNDERSTORMS APPROACHING FROM THE NORTH. 
RUN-OFF FROM RECENT HEAVY RAINFALL OVER WESTERN BEXAR COUNTY IS 
LIKELY PRODUCING CONTINUED FLOODING OVER NORMALLY FLOOD PRONE URBAN 
AREAS. A FLASH FLOOD WARNING MAY BE ISSUED IN THE NEXT HALF HOUR TO 
ACCOUNT FOR VERY HEAVY RAINS APPROACHING FROM THE NORTH. 

DO NOT DRIVE WHERE WATER COVERS THE ROAD. TWO FEET OF RUSHING WATER 
CAN CARRY AWAY MOST VEHICLES...INCLUDING SUVS AND PICKUPS. TURN 
AROUND DONT DROWN.

LAT...LON 2963 9858 2972 9876 2944 9877 2940 9854

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 5:25 PM CDTFlash Flood WarningEWXBurnet, Travis, Williamson3 hr
Jul 23, 5:42 PM CDTFlash Flood WarningEWXHays3 hr
Jul 23, 6:27 PM CDTFlash Flood WarningEWXComal, Guadalupe3 hr
Jul 23, 6:33 PM CDTFlash Flood WarningEWXBlanco, Kendall3 hr
Jul 23, 6:57 PM CDTSevere Thunderstorm WarningEWXComal, Guadalupe37 min
Jul 23, 6:59 PM CDTTornado WarningEWXWilliamson35 min

Nearby

Flash Flood Warnings in Texas, 2007Every flash flood warning in 2007

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.