Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 375, NWS Austin/San Antonio, TX

July 23, 2007Comal County, Guadalupe County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 23, 2007, 6:27 PM CDT for Comal County, Guadalupe 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 counties it named.

The facts

Issued
Jul 23, 2007, 6:27 PM CDT (23:27 UTC)
Expired
Jul 23, 2007, 9:30 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Comal County, TX, Guadalupe County, TX

The radar

The Austin/San Antonio radar (KEWX), 8 km from the middle of the area, began a volume at 23:29 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, 11.5 hours before the alert went out and 231 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 232328
FFWEWX
TXC091-187-240230-

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

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COMAL COUNTY IN SOUTH CENTRAL TEXAS...
  THIS INCLUDES THE CITIES OF...NEW BRAUNFELS...CANYON LAKE DAM...
  GUADALUPE COUNTY IN SOUTH CENTRAL TEXAS...
  THIS INCLUDES THE CITY OF SEGUIN...

* UNTIL 930 PM CDT

* AT 624 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 ZORN AND
  SMITHSON VALLEY

VERY HEAVY RAINFALL OF ONE TO TWO INCHES PER HOUR WILL CONTINUE AND 
CAUSE RAPID RUNOFF LEADING TO FLASH FLOODING.

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 2961 9765 2992 9826 2982 9839 2961 9823
      2941 9792

$$
2 follow-up statements
000 
WGUS74 KEWX 240149
FFSEWX

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

TXC091-187-240230-
COMAL TX-GUADALUPE TX-
848 PM CDT MON JUL 23 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
GUADALUPE AND COMAL COUNTIES...

AT 847 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECT 
PATCHY LIGHT TO MODERATE RAINS ACROSS COMAL AND GUADALUPE COUNTIES. 
RAINFALL RATES OF LESS THAN ONE QUARTER INCH WERE NOTED. SOME 
FLOODING CAN STILL BE EXPECTED DUE TO EARLIER HEAVY RAINS. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ZORN...
SMITHSON VALLEY...NEW BRAUNFELS AND CANYON LAKE DAM

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

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.

LAT...LON 2961 9765 2992 9826 2982 9839 2961 9823
      2941 9792

$$
000 
WGUS74 KEWX 240225
FFSEWX

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

TXC091-187-240233-
COMAL TX-GUADALUPE TX-
923 PM CDT MON JUL 23 2007

...THE FLASH FLOOD WARNING WILL EXPIRE AT 930 PM CDT FOR GUADALUPE
AND COMAL COUNTIES...

AT 920 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED  
PATCHY LIGHT RAINS ACROSS MAINLY GUADALUPE COUNTY. THE THREAT FOR 
FLASH FLOODING HAS ENDED. AS A RESULT...THE FLASH FLOOD WARNING WILL 
BE ALLOWED TO EXPIRE. SOME MINOR RISES ON SMALL STREAMS IS STILL 
POSSIBLE DUE TO EARLIER HEAVY RAINS. 

LAT...LON 2961 9765 2992 9826 2982 9839 2961 9823
      2941 9792

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 4:56 PM CDTFlash Flood WarningEWXBexar2 hr
Jul 23, 5:25 PM CDTFlash Flood WarningEWXBurnet, Travis, Williamson3 hr
Jul 23, 5:42 PM CDTFlash Flood WarningEWXHays3 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.