Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 486, NWS Austin/San Antonio, TX

August 18, 2007Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 18, 2007, 2:53 AM CDT for Val Verde County, Texas. It was in force for 5 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
Aug 18, 2007, 2:53 AM CDT (07:53 UTC)
Expired
Aug 18, 2007, 7:30 AM CDT
In force
5 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 109 km from the middle of the area, began a volume at 07:56 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

Del Rio, TX (KDRT), launched 00:00Z, 7.9 hours before the alert went out and 66 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 2007-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2781 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, Del Rio, TX at 00:00Z on 2007-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
2781 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1575 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
113 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 180755
FFWEWX
TXC465-181230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
253 AM CDT SAT AUG 18 2007

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  VAL VERDE COUNTY...
  THIS INCLUDES THE CITIES OF...LOMA ALTA...LANGTRY...JUNO...
  COMSTOCK...

* UNTIL 730 AM CDT

* AT 251 AM CDT...BASED ON NEXRAD RADAR ESTIMATES OF 4 TO 6 INCH 
RAIN TOTALS BETWEEN PANDALE AND JUNO...NATIONAL WEATHER SERVICE 
METEOROLOGISTS HAVE DETERMINED THAT FLASH FLOODING WILL CONTINUE 
OVER NORTH AND CENTRAL VAL VERDE COUNTY UNTIL AT LEAST 730 AM CDT.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PANDALE AND
  LOMA ALTA

IT IS ESPECIALLY HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. 

REMEMBER...TURN AROUND DONT DROWN.

LAT...LON 2980 10174 2979 10136 2965 10128 2966 10071
      3028 10069 3028 10173

$$
1 follow-up statement
000 
WGUS74 KEWX 181116
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
609 AM CDT SAT AUG 18 2007

TXC465-181230-
VAL VERDE TX-
609 AM CDT SAT AUG 18 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT FOR VAL
VERDE COUNTY...

AT 606 AM CDT...LIGHT TO MODERATE RAIN WAS FALLING FROM SHOWERS AND 
THUNDERSTORMS BETWEEN PANDALE AND JUNO.  REPORTS FROM THE PANDALE 
AREA INDICATE THAT NEARLY 5 INCHES FELL IN THE PERIOD FROM 1 AM 
THROUGH 4 AM THIS MORNING.  FLOODING IS REPORTED ALONG THE PECOS 
RIVER FROM PANDALE SOUTHWARD.  FLOODING IS ALSO OCCURRING ALONG THE 
DEVILS RIVER FROM NEAR THE CROCKETT-VAL VERDE COUNTY LINE TO JUNO.  
THE STORMS PRODUCING THE HEAVY RAIN AND FLOODING HAVE WEAKENED OVER 
THE PAST HOUR.

IT IS VERY DIFFICULT TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. 
PLEASE USE EXTRA CAUTION.
REMEMBER...TURN AROUND DONT DROWN.

LAT...LON 2980 10174 2979 10136 2965 10128 2966 10071
      3028 10069 3028 10173

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 8:27 PM CDTFlash Flood WarningEWXVal Verde3 hr
Aug 17, 8:55 PM CDTFlash Flood WarningEWXEdwards3 hr
Aug 17, 11:29 PM CDTFlash Flood WarningEWXVal Verde4 hr
Aug 18, 12:41 AM CDTRiver Flood WarningEWXVal Verde43 hr
Aug 18, 12:41 AM CDTRiver Flood WarningEWXVal Verde57 hr
Aug 18, 12:41 AM CDTRiver Flood WarningEWXVal Verde43 hr
Aug 18, 2:02 AM CDTRiver Flood WarningEWXVal Verde8 hr
Aug 18, 2:02 AM CDTRiver Flood WarningEWXVal Verde18 hr

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.