Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 113, NWS Austin/San Antonio, TX

May 1, 2007Llano County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 1, 2007, 5:34 PM CDT for Llano 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
May 1, 2007, 5:34 PM CDT (22:34 UTC)
Expired
May 1, 2007, 8:30 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Llano County, TX

The radar

The Ft Hood radar (KGRK), 124 km from the middle of the area, began a volume at 22:35 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 12:00Z, 10.6 hours before the alert went out and 255 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 12:00Z on 2007-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2016 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, Del Rio, TX at 12:00Z on 2007-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 square meters per square second.19395878Sfc1 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
2016 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
704 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 012235
FFWEWX
TXC299-020130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
534 PM CDT TUE MAY 1 2007

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LLANO COUNTY IN SOUTH CENTRAL TEXAS...
  THIS INCLUDES THE CITIES OF...LLANO...KINGSLAND...BUCHANAN DAM...

* UNTIL 830 PM CDT

* AT 530 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 TOW

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 EVER DRIVE THROUGH 
FLOODED AREAS...ESPECIALLY AT NIGHT. STAY TUNED TO NOAA WEATHER 
RADIO OR LOCAL NEWS MEDIA FOR THE LATEST FLOOD INFORMATION.

LAT...LON 3089 9847 3084 9841 3084 9838 3080 9843
      3077 9843 3075 9837 3067 9844 3058 9841
      3057 9835 3051 9835 3052 9896 3092 9896
      3092 9844

$$
2 follow-up statements
000 
WGUS74 KEWX 012257
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
553 PM CDT TUE MAY 1 2007

TXC299-020130-
LLANO TX-
553 PM CDT TUE MAY 1 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR LLANO
COUNTY...

AT 549 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE NORTHERN HALF
OF LLANO COUNTY. THE HEAVIEST RAINS WERE OCCURRING ALONG AND NORTH 
OF HIGHWAY 29. MOVEMENT WAS SOUTH AT 15 TO 20 MPH. RAINFALL RATES 
WERE ESTIMATED AT 1 TO 3 INCHES AN HOUR.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TOW...SUNRISE
BEACH VILLAGE...KINGSLAND...HORSESHOE BAY...CASTELL...BUCHANAN DAM
AND LLANO

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT TUESDAY EVENING
FOR SOUTH CENTRAL TEXAS.

LAT...LON 3089 9847 3084 9841 3084 9838 3080 9843
      3077 9843 3075 9837 3067 9844 3058 9841
      3057 9835 3051 9835 3052 9896 3092 9896
      3092 9844

$$
000 
WGUS74 KEWX 012340
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
637 PM CDT TUE MAY 1 2007

TXC299-020130-
LLANO TX-
637 PM CDT TUE MAY 1 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR LLANO
COUNTY...

AT 631 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LARGE THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE 
THE WESTERN HALF OF LLANO COUNTY. RAINFALL RATES WERE ESTIMATED AT
1 TO 3 INCHES AN HOUR. MOVEMENT WAS SOUTH AT 10 TO 15 MPH.

LOCATIONS IN THE WARNING INCLUDE LLANO...CASTELL AND VALLEY SPRING.

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT TUESDAY EVENING
FOR SOUTH CENTRAL TEXAS.

LAT...LON 3080 9865 3074 9864 3067 9865 3062 9863
      3058 9861 3057 9862 3056 9860 3054 9862
      3055 9860 3052 9858 3052 9896 3092 9896
      3091 9869

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 7:14 PM CDTSevere Thunderstorm WarningEWXDeWitt16 min
May 1, 5:07 PM CDTSevere Thunderstorm WarningEWXLlano53 min
May 1, 5:53 PM CDTSevere Thunderstorm WarningEWXLlano37 min
May 1, 6:19 PM CDTSevere Thunderstorm WarningEWXWilliamson26 min
May 1, 6:27 PM CDTSevere Thunderstorm WarningEWXLlano52 min
May 1, 6:52 PM CDTSevere Thunderstorm WarningEWXGillespie53 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.