Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 32, NWS Austin/San Antonio, TX

May 10, 20125 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 10, 2012, 2:19 PM CDT for 5 counties in Texas. It was in force for 3 hr. 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
May 10, 2012, 2:19 PM CDT (19:19 UTC)
Expired
May 10, 2012, 5:30 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

Counties Atascosa County, TX, DeWitt County, TX, Gonzales County, TX, Karnes County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 85 km from the middle of the area, began a volume at 19:19 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
May 10, 4:25 PM CDTFLASH FLOODPoth, TXSMALL ROADS CLOSED COUNTY WIDE IN WILSON COUNTY DUE TO FLOODING

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, 7.3 hours before the alert went out and 150 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 2012-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1593 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, Corpus Christi, TX at 12:00Z on 2012-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
1593 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

524 
WGUS54 KEWX 101919
FFWEWX
TXC013-123-177-255-493-102230-
/O.NEW.KEWX.FF.W.0032.120510T1919Z-120510T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
219 PM CDT THU MAY 10 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN ATASCOSA COUNTY...
  WESTERN DEWITT COUNTY...
  SOUTHWESTERN GONZALES COUNTY...
  KARNES COUNTY...
  WILSON COUNTY...

* UNTIL 530 PM CDT.

* AT 217 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED
  TO DETECT VERY HEAVY RAIN WITH THUNDERSTORMS ACROSS MUCH OF
  ATASCOSA...WILSON...AND SOUTHWESTERN GONZALES COUNTY AND MOVING
  INTO DEWITT AND KARNES COUNTIES. RAINFALL ESTIMATES UP TO 5 INCHES
  HAVE BEEN OBSERVED BY RADAR. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CAMPBELLTON...CHRISTINE...FLORESVILLE...GONZALES...KARNES CITY...
  KENEDY...KOSCIUSKO...POTH...STOCKDALE...CESTOHOWA...CHEAPSIDE...
  FALLS CITY...GILLETT...LA VERNIA...NIXON...PANDORA...RUNGE...
  SMILEY...SMITHSON VALLEY...SUTHERLAND SPRINGS AND WESTHOFF.

ADDITIONAL RAINFALL OF 2 TO 4 INCHES CAN BE EXPECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2864 9865 2910 9840 2938 9816 2936 9778
      2956 9738 2932 9736 2869 9778 2867 9784
      2871 9794 2869 9801 2877 9810 2863 9830

$$
1 follow-up statement
062 
WGUS74 KEWX 102220
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
520 PM CDT THU MAY 10 2012

TXC013-123-177-255-493-102230-
/O.CON.KEWX.FF.W.0032.000000T0000Z-120510T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DEWITT TX-GONZALES TX-WILSON TX-KARNES TX-ATASCOSA TX-
520 PM CDT THU MAY 10 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
EASTERN ATASCOSA...KARNES...WILSON...SOUTHWESTERN GONZALES AND
WESTERN DEWITT COUNTIES...

AT 520 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT HEAVY THUNDERSTORM CLUSTERS FROM EASTERN KARNES COUNTY 
NORTHEAST INTO WESTERN DEWITT COUNTY...MOVING NORTHEAST AT 25 MPH. 
RAINFALL RATES OF UP TO 2 AND A HALF INCHES PER HOUR WERE INDICATED 
IN THESE STORMS. 

SMALL STREAMS AND CREEKS WILL FLOOD LOW WATER CROSSINGS ACROSS THE 
COUNTY THE NEXT FEW HOURS.  MOTORISTS SHOULD APPROACH LOW BRIDGES 
AND CROSSINGS CAREFULLY...AND IN NO CIRCUMSTANCES ENTER FLOODED 
CROSSING

LOCATIONS IN THE WARNING AREA INCLUDE GILLETT...FALLS CITY...
CESTOHOWA...WESTHOFF...SUTHERLAND SPRINGS...STOCKDALE...POTH...
PANDORA...LA VERNIA...KOSCIUSKO...FLORESVILLE...SMILEY...NIXON...
GONZALES AND CHEAPSIDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT THURSDAY EVENING
FOR SOUTH CENTRAL TEXAS. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 800 PM CDT THURSDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2864 9865 2910 9840 2938 9816 2936 9778
      2956 9738 2932 9736 2869 9778 2867 9784
      2871 9794 2869 9801 2877 9810 2863 9830

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 5:21 AM CDTSevere Thunderstorm WarningEWXVal Verde54 min
May 10, 6:12 AM CDTSevere Thunderstorm WarningEWXVal Verde63 min
May 10, 7:19 AM CDTSevere Thunderstorm WarningEWXEdwards, Val Verde44 min
May 10, 9:29 AM CDTSevere Thunderstorm WarningEWXDimmit, Frio, Zavala61 min
May 10, 10:30 AM CDTSevere Thunderstorm WarningEWXFrio60 min
May 10, 10:33 AM CDTAreal Flood AdvisoryEWXFrio117 min
May 10, 11:17 AM CDTSevere Thunderstorm WarningEWXAtascosa, Frio58 min
May 10, 11:32 AM CDTSevere Thunderstorm WarningEWXAtascosa, Wilson58 min
May 10, 12:02 PM CDTFlash Flood WarningEWXVal Verde3 hr
May 10, 12:14 PM CDTSevere Thunderstorm WarningEWXAtascosa, Frio31 min
May 10, 12:20 PM CDTAreal Flood AdvisoryEWXAtascosa, Frio2 hr
May 10, 12:40 PM CDTAreal Flood AdvisoryEWXBandera, Edwards, Kerr, Kinney, Real, Uvalde110 min
May 10, 1:04 PM CDTSevere Thunderstorm WarningEWXKarnes, Wilson56 min
May 10, 1:15 PM CDTTornado WarningEWXGonzales, Karnes, Wilson45 min
May 10, 1:42 PM CDTTornado WarningEWXAtascosa33 min
May 10, 1:57 PM CDTTornado WarningEWXDeWitt, Gonzales, Karnes, Wilson33 min
May 10, 2:24 PM CDTSevere Thunderstorm WarningEWXKarnes51 min
May 10, 2:42 PM CDTTornado WarningEWXKarnes48 min
May 10, 2:49 PM CDTFlash Flood WarningEWXBandera, Edwards, Kerr, Real, Uvalde3 hr
May 10, 3:05 PM CDTTornado WarningEWXWilson40 min
May 10, 3:31 PM CDTTornado WarningEWXKarnes29 min
May 10, 3:40 PM CDTRiver Flood WarningEWXVal Verde31 hr
May 10, 3:45 PM CDTAreal Flood AdvisoryEWXDeWitt, Fayette, Gonzales, Lavaca105 min
May 10, 3:57 PM CDTTornado WarningEWXDeWitt, Karnes, Wilson33 min
May 10, 4:39 PM CDTFlash Flood WarningEWXBandera, Gillespie, Kerr81 min
May 10, 4:52 PM CDTSevere Thunderstorm WarningEWXDeWitt, Gonzales, Karnes29 min
May 10, 5:58 PM CDTFlash Flood WarningEWXBandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 4 more3 hr
May 10, 5:58 PM CDTSevere Thunderstorm WarningEWXDimmit, Maverick, Uvalde, Zavala47 min
May 10, 6:11 PM CDTAreal Flood AdvisoryEWXDeWitt, Fayette, Karnes, Lavaca109 min
May 10, 6:41 PM CDTSevere Thunderstorm WarningEWXDimmit, Frio, Zavala49 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.