Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 29, NWS Austin/San Antonio, TX

March 28, 2012DeWitt County, Karnes County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Mar 28, 2012, 5:55 PM CDT for DeWitt County, Karnes County, Texas. It was in force for 3 hr. 2 reports 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
Mar 28, 2012, 5:55 PM CDT (22:55 UTC)
Expired
Mar 28, 2012, 8:30 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

Counties DeWitt County, TX, Karnes County, TX

What was reported inside it

TimeReportWhereRemark
Mar 28, 7:15 PM CDTHEAVY RAIN 5.6Karnes City, TX5.6 INCHES RAINFALL TOTAL UP TO 715 PM IN KARNES CITY.
Mar 28, 7:17 PM CDTFLASH FLOOD1 Sw Karnes City, TXWATER OVER THE ROAD AT HIGHWAY 181 AT CALVERT AVE...AND FM 80 AT FM 81. PROCESS IS UNDERWAY TO CLOSE THESE ROADS.

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, 10.9 hours before the alert went out and 140 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 2012-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 980 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 2012-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
980 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
457 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
120 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.

821 
WGUS54 KEWX 282255
FFWEWX
TXC123-255-290130-
/O.NEW.KEWX.FF.W.0029.120328T2255Z-120329T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
555 PM CDT WED MAR 28 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN DEWITT COUNTY...
  CENTRAL KARNES COUNTY...

* UNTIL 830 PM CDT.

* AT 541 PM CDT...SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY
  RAINFALL ACROSS KARNES COUNTY AND SOUTHWESTERN DEWITT COUNTY. THE
  HEAVIEST RAINFALL HAS GENERALLY BEEN BETWEEN KARNES CITY AND 
  NORDHEIM...WHERE RADAR ESTIMATES THAT BETWEEN 2 TO 4 INCHES OR MORE
  OF RAIN HAS FALLEN SINCE 5 PM. ADDITIONAL RAINFALL OF 2 OR MORE 
  INCHES IS POSSIBLE THROUGH THIS EVENING AND MAY QUICKLY LEAD TO 
  FLASH FLOODING.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. LOW WATER CROSSINGS WILL BECOME IMPASSIBLE. SOME OF THE
  HEAVIEST RAIN HAS FALLEN OVER AREAS WHICH INCLUDE FM 627...FM 
  81...STATE HIGHWAY 80...AND STATE HIGHWAY 72. DRIVERS CAN EXPECT 
  WATER ON THE ROAD AND POSSIBLY FLOODING...AND SHOULD SEEK ALTERNATE
  ROUTES. ADDITIONAL LOCATIONS THAT WILL EXPERIENCE FLOODING 
  INCLUDE...KARNES CITY...KENEDY...NORDHEIM AND RUNGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2906 9768 2889 9749 2874 9790 2892 9801

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 28, 4:36 PM CDTAreal Flood AdvisoryEWXDeWitt, Lavaca114 min
Mar 28, 5:08 PM CDTFlash Flood WarningEWXDeWitt, Lavaca112 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.