Alert archive / Texas / Flash Flood Warnings in 2008

Flash Flood Warning 13, NWS Austin/San Antonio, TX

August 18, 2008Real County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 18, 2008, 4:28 PM CDT for Real County, Texas. It was in force for 89 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 18, 2008, 4:28 PM CDT (21:28 UTC)
Expired
Aug 18, 2008, 5:57 PM CDT
In force
89 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

County Real County, TX

The radar

The Laughlin AFB radar (KDFX), 86 km from the middle of the area, began a volume at 21:32 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, 9.5 hours before the alert went out and 115 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 2008-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1096 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 2008-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
1096 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
550 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
79 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 182128
FFWEWX
TXC385-190015-
/O.NEW.KEWX.FF.W.0013.080818T2128Z-080819T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
428 PM CDT MON AUG 18 2008

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN REAL COUNTY...

* UNTIL 715 PM CDT.

* AT 417 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETERMINED THAT
  RAINFALL RATE ESTIMATES OF 2 TO 2 AND A HALF INCHES PER HOUR FROM A 
  THUNDERSTORM OVER THE HEADWATERS OF THE FRIO RIVER WITH THE STORM MOVING 
  SOUTH ABOUT 15 MPH ALONG THE RIVER. THIS WILL PRODUCE LOCALIZED FLOODING
  ALONG THE RIVER OVER NORTHERN REAL COUNTY. RIVER RECREATIONISTS 
  AND OTHER INTERESTS SHOULD SEEK HIGHER GROUND AND BE ALERT FOR RISING
  RIVER LEVELS DOWNSTREAM. 

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

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

LAT...LON 3007 9997 3006 9970 2980 9970 2980 10000

$$
2 follow-up statements
000 
WGUS74 KEWX 182154
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
454 PM CDT MON AUG 18 2008

TXC385-190015-
/O.CON.KEWX.FF.W.0013.000000T0000Z-080819T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
REAL TX-
454 PM CDT MON AUG 18 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHERN REAL COUNTY...

AT 447 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
INDICATE HEAVY RAINS FROM A THUNDERSTORM MOVING SOUTH ABOUT 20 MPH 
ALONG THE FRIO RIVER OVER NORTHERN REAL COUNTY.  THIS STORM COULD 
PRODUCE SUDDEN RISES ALONG THE FRIO RIVER DOWNSTREAM TO LEAKEY OVER 
THE NEXT SEVERAL HOURS. LOCATIONS IN THE WARNING AREA INCLUDE PRADE 
RANCH.

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

LAT...LON 3007 9997 3006 9970 2980 9970 2980 10000

$$
000 
WGUS74 KEWX 182257
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
557 PM CDT MON AUG 18 2008

TXC385-182305-
/O.CAN.KEWX.FF.W.0013.000000T0000Z-080819T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
REAL TX-
557 PM CDT MON AUG 18 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN REAL
COUNTY...

HEAVY RAINS HAVE DIMINISHED OVER REAL COUNTY DURING THE PAST HOUR
AND NO REPORTS OF FLOODING HAVE BEEN RECEIVED..THUS THE FLASH FLOOD
WARNING ISSUED EARLIER FOR NORTHERN FRIO COUNTY HAS BEEN CANCELLED.


LAT...LON 3007 9997 3006 9970 2980 9970 2980 10000

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 11:20 PM CDTAreal Flood AdvisoryEWXVal Verde115 min
Aug 18, 11:12 AM CDTAreal Flood AdvisoryEWXBexar, Comal, Guadalupe108 min
Aug 18, 1:23 PM CDTAreal Flood AdvisoryEWXDeWitt, Karnes112 min
Aug 18, 2:03 PM CDTAreal Flood AdvisoryEWXWilson117 min

Nearby

Flash Flood Warnings in Texas, 2008Every flash flood warning in 2008

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.