Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 484, NWS Austin/San Antonio, TX

August 17, 2007Edwards County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 17, 2007, 8:55 PM CDT for Edwards 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
Aug 17, 2007, 8:55 PM CDT (01:55 UTC)
Expired
Aug 17, 2007, 11:45 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Edwards County, TX

The radar

The Laughlin AFB radar (KDFX), 79 km from the middle of the area, began a volume at 01:59 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, 1.9 hours before the alert went out and 86 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 180156
FFWEWX
TXC137-180445-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
855 PM CDT FRI AUG 17 2007

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EDWARDS COUNTY...

* UNTIL 1145 PM CDT

* AT 855 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETERMINED THAT   
  AN AREA OF THUNDERSTORMS ARE PRODUCING FLASH FLOODING OVER 
  NORTHWESTERN EDWARDS COUNTY. THESE THUNDERSTORMS WERE LOCATED 
  FROM LOMA ALTA TO THE INTERSECTION OF HIGHWAYS 277 AND 55...MOVING 
  NORTHEAST AT 10 MPH.

RAINFALL AMOUNTS OF 3 TO 6 INCHES WILL BE POSSIBLE ALONG HIGHWAY 277 
BY 10 PM.

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 3015 10048 3013 10051 2998 10062 2996 10065
      2992 10067 2991 10069 3029 10069 3029 10038

$$
1 follow-up statement
000 
WGUS74 KEWX 180223
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
921 PM CDT FRI AUG 17 2007

TXC137-180445-
EDWARDS TX-
921 PM CDT FRI AUG 17 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT FOR
EDWARDS COUNTY...

AT 921 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT TRAINING THUNDERSTORMS PRODUCING FLASH FLOODING OVER 
NORTHWESTERN EDWARDS COUNTY. THESE STORMS WILL AFFECT AREAS ALONG 
HIGHWAY 277 AND ADJACENT AREAS OF HIGHWAY 55. EXPECT HEAVY RAINFALL 
AMOUNTS OF 3 TO 5 INCHES TO PRODUCE FLASH FLOODING THROUGH AT LEAST 
11 PM. ADDITIONAL THUNDERSTORMS OVER VAL VERDE COUNTY COULD MOVE 
INTO THESE SAME AREAS LATER TONIGHT. CELL MOVEMENT IS NORTHEAST AT 
15 MPH.

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. 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 3015 10048 3013 10051 2998 10062 2996 10065
      2992 10067 2991 10069 3029 10069 3029 10038

$$

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, 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
Aug 18, 2:53 AM CDTFlash Flood WarningEWXVal Verde5 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.