Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 65, NWS Austin/San Antonio, TX

October 26, 2012Bexar County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Oct 26, 2012, 12:33 PM CDT for Bexar County, Texas. It was in force for 117 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Oct 26, 2012, 12:33 PM CDT (17:33 UTC)
Expired
Oct 26, 2012, 2:30 PM CDT
In force
117 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 45 km from the middle of the area, began a volume at 17:35 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.

What was reported inside it

TimeReportWhereRemark
Oct 26, 1:13 PM CDTFLASH FLOODSan Antonio, TXFLASH FLOODING CAUSED ROAD CLOSURE ON VANCE JACKSON AT ORSINGER

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 5.6 hours before the alert went out and 224 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 2012-10-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2366 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, Corpus Christi, TX at 12:00Z on 2012-10-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
2366 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
637 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
5 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.8

Open this sounding in Storm Lab

The text

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

599 
WGUS54 KEWX 261733
FFWEWX
TXC029-261930-
/O.NEW.KEWX.FF.W.0065.121026T1733Z-121026T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1233 PM CDT FRI OCT 26 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BEXAR COUNTY...

* UNTIL 230 PM CDT.

* AT 1230 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE SLOW
  MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS CENTRAL AND 
  EASTERN BEXAR COUNTY. DOPPLER RADAR ESTIMATES ONE TO TWO INCHES OF
  RAIN HAS FALLEN OVER THE AREA AND AN ADDITIONAL INCH OF RAINFALL  
  IS POSSIBLE. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
  ANTONIO...ALAMO HEIGHTS...CALAVERAS LAKE...CHINA GROVE...
  ELMENDORF...HOLLYWOOD PARK...KIRBY...LACKLAND AFB...LEON VALLEY...
  LIVE OAK...OLMOS PARK...SHAVANO PARK...ST. HEDWIG...TERRELL HILLS
  AND WINDCREST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.

&&

LAT...LON 2968 9840 2955 9832 2946 9816 2917 9837
      2934 9865 2962 9868

$$
1 follow-up statement
996 
WGUS74 KEWX 261837
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
137 PM CDT FRI OCT 26 2012

TXC029-261930-
/O.CON.KEWX.FF.W.0065.000000T0000Z-121026T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
137 PM CDT FRI OCT 26 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR BEXAR
COUNTY...

AT 113 PM CDT...THE CITY OF SAN ANTONIO PUBLIC WORKS REPORTED 
SEVERAL ROAD CLOSURES IN SAN ANTONIO DUE TO WATER OVER THE ROADWAY. 
ROAD CLOSURES INCLUDE LESLIE ROAD FROM BRAUN TO LOOP 1604 AND VANCE 
JACKSON AT ORSINGER. 

AT 124 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT SHOWERS AND THUNDERSTORMS OVER MUCH OF BEXAR COUNTY. WHILE 
THE HEAVIEST ACTIVITY HAS MOVED EAST OF THE CITY...AN ADDITIONAL ONE 
HALF INCH OF RAINFALL REMAINS POSSIBLE. ANY ADDITIONAL RAINFALL WILL 
ONLY AGGRAVATE ONGOING FLOODING...THUS THE FLASH FLOOD WARNING FOR 
BEXAR COUNTY REMAINS IN EFFECT. 

LOCATIONS IN THE WARNING AREA INCLUDE CASTLE HILLS...TERRELL 
HILLS...SOUTHTON...SHAVANO PARK...LEON SPRINGS...HOLLYWOOD PARK AND 
ALAMO HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RUNOFF FROM HEAVY RAIN WILL FLOOD CREEKS, STREAMS, STREET
INTERSECTIONS, CULVERTS AND UNDERPASSES. LOW LYING PLACES THAT
NORMALLY FLOOD COULD BECOME DEATH TRAPS. DO NOT CROSS ANY FLOODED
AREA. TURN AROUND DON'T DROWN.

WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.

&&

LAT...LON 2968 9840 2955 9832 2946 9816 2917 9837
      2934 9865 2962 9868

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 26, 11:48 AM CDTAreal Flood AdvisoryEWXBexar102 min
Oct 26, 12:40 PM CDTSpecial Weather StatementEWXWilson50 min

Nearby

Flash Flood Warnings in Texas, 2012Every flash flood warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.