Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 26, NWS Austin/San Antonio, TX

March 20, 201210 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Mar 20, 2012, 5:11 AM CDT for 10 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: Mar 20, 2012, 5:11 AM CDT (10:11 UTC)
Expired: Mar 20, 2012, 8:00 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

Counties Bastrop County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Guadalupe County, TX, Hays County, TX, Lee County, TX, Travis County, TX, Williamson County, TX

What was reported inside it

Time	Report	Where	Remark
Mar 20, 7:55 AM CDT	FLASH FLOOD	4 E New Braunfels, TX	SAUR LN CLOSED DUE TO FLOODED LOW WATER CROSSING

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 00:00Z, 10.2 hours before the alert went out and 314 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2851 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 778 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

859 
WGUS54 KEWX 201011
FFWEWX
TXC021-031-053-055-091-187-209-287-453-491-201300-
/O.NEW.KEWX.FF.W.0026.120320T1011Z-120320T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
511 AM CDT TUE MAR 20 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN BASTROP COUNTY...
  SOUTHEASTERN BLANCO COUNTY...
  EASTERN BURNET COUNTY...
  NORTHWESTERN CALDWELL COUNTY...
  COMAL COUNTY...
  WESTERN GUADALUPE COUNTY...
  HAYS COUNTY...
  NORTHWESTERN LEE COUNTY...
  TRAVIS COUNTY...
  WILLIAMSON COUNTY...

* UNTIL 800 AM CDT.

* AT 509 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE   
  FLASH FLOODING ACROSS THE I35 CORRIDOR FROM NEW BRAUNFELS TO THE
  AUSTIN AND GEORGETOWN AREAS. ADDITIONAL RAINS OF ONE HALF INCH 
  OVER AREAS THAT HAVE ALREADY RECEIVED HEAVY RAINFALL
  OVERNIGHT WILL CONTINUE TO KEEP FLOODING PROBLEMS ONGOING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...ANDERSON
  MILL...AUSTIN...AUSTIN BERGSTROM INT AP...CANYON LAKE DAM...CEDAR
  PARK...DRIPPING SPRINGS...ELGIN...GEORGETOWN...GRANGER...NEW
  BRAUNFELS...PFLUGERVILLE...ROUND ROCK...SAN MARCOS...SERENADA...
  TANGLEWOOD FOREST...TAYLOR...WIMBERLEY...WINDEMERE...ANDICE...
  BARTLETT...BEE CAVE...BRIGGS...BUDA...COUPLAND...DRIFTWOOD...
  FISCHER...FLORENCE...GEORGETOWN DAM...GERONIMO AND GRANGER DAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3091 9782 3088 9762 3073 9726 3046 9714
      2946 9811 2985 9845 3104 9791

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 19, 7:17 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Frio	58 min
Mar 19, 7:29 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	46 min
Mar 19, 7:35 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr, Real	55 min
Mar 19, 7:37 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	53 min
Mar 19, 7:42 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	29 min
Mar 19, 7:44 PM CDT	Tornado Warning	EWX	Atascosa, Medina	31 min
Mar 19, 8:02 PM CDT	Tornado Warning	EWX	Bandera, Kerr	43 min
Mar 19, 8:02 PM CDT	Tornado Warning	EWX	Atascosa, Bexar, Medina	48 min
Mar 19, 8:07 PM CDT	Tornado Warning	EWX	Atascosa, Frio	53 min
Mar 19, 8:25 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Medina, Real, Uvalde	65 min
Mar 19, 8:29 PM CDT	Severe Thunderstorm Warning	EWX	Real, Uvalde	61 min
Mar 19, 8:39 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kendall, Kerr	66 min
Mar 19, 8:56 PM CDT	Tornado Warning	EWX	Atascosa, Bexar	22 min
Mar 19, 9:07 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Uvalde	53 min
Mar 19, 9:13 PM CDT	Areal Flood Warning	EWX	Bandera, Gillespie, Kerr, Real, Uvalde	10 min
Mar 19, 9:23 PM CDT	Flash Flood Warning	EWX	Bandera, Gillespie, Kerr, Real, Uvalde	3 hr
Mar 19, 9:30 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr, Medina, Uvalde	60 min
Mar 19, 9:31 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Maverick, Real, Uvalde, Zavala	59 min
Mar 19, 9:59 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Gillespie, Kendall, Kerr	61 min
Mar 19, 10:31 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie	44 min
Mar 19, 10:34 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kendall, Kerr	41 min
Mar 19, 10:58 PM CDT	Flash Flood Warning	EWX	Bandera, Kinney, Medina, Real, Uvalde	4 hr
Mar 19, 11:03 PM CDT	Flash Flood Warning	EWX	Bandera, Blanco, Burnet, Gillespie, Kendall, Kerr and 2 more	3 hr
Mar 19, 11:03 PM CDT	Severe Thunderstorm Warning	EWX	Medina, Uvalde	42 min
Mar 19, 11:16 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Gillespie, Kendall, Kerr, Medina	44 min
Mar 19, 11:39 PM CDT	Severe Thunderstorm Warning	EWX	Medina	21 min
Mar 20, 12:14 AM CDT	Areal Flood Advisory	EWX	Comal, Hays, Kendall, Travis, Williamson	3 hr
Mar 20, 12:20 AM CDT	Areal Flood Advisory	EWX	Atascosa, Bandera, Bexar, Medina	3 hr
Mar 20, 12:28 AM CDT	Areal Flood Advisory	EWX	Dimmit, Maverick, Uvalde, Zavala	3 hr
Mar 20, 1:03 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick	42 min
Mar 20, 1:11 AM CDT	River Flood Warning	EWX	Kerr	8 hr
Mar 20, 1:11 AM CDT	River Flood Warning	EWX	Kendall	8 hr
Mar 20, 1:24 AM CDT	Flash Flood Warning	EWX	Atascosa, Bandera, Bexar, Frio, Medina	3 hr
Mar 20, 1:41 AM CDT	Areal Flood Advisory	EWX	Bastrop, Bexar, Caldwell, Comal, Guadalupe, Hays and 4 more	109 min
Mar 20, 1:59 AM CDT	Flash Flood Warning	EWX	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 7 more	3 hr
Mar 20, 2:16 AM CDT	Areal Flood Advisory	EWX	Atascosa, Frio, Guadalupe, Karnes, Medina, Wilson	104 min
Mar 20, 2:24 AM CDT	Flash Flood Warning	EWX	Bastrop, Caldwell, DeWitt, Fayette, Gonzales, Guadalupe and 3 more	3 hr
Mar 20, 3:09 AM CDT	Flash Flood Warning	EWX	Blanco, Burnet, Gillespie, Llano	3 hr
Mar 20, 3:51 AM CDT	Flash Flood Warning	EWX	DeWitt, Fayette, Gonzales, Karnes, Lavaca, Wilson	3 hr
Mar 20, 4:05 AM CDT	Tornado Warning	EWX	DeWitt, Karnes	25 min
Mar 20, 5:29 AM CDT	Flash Flood Warning	EWX	Bastrop, Caldwell, Fayette, Gonzales, Guadalupe, Lee	2 hr
Mar 20, 6:23 AM CDT	River Flood Warning	EWX	Bandera	4 hr
Mar 20, 7:27 AM CDT	River Flood Warning	EWX	Williamson	3 hr
Mar 20, 7:27 AM CDT	River Flood Warning	EWX	Williamson	13 hr
Mar 20, 8:29 AM CDT	River Flood Warning	EWX	Caldwell, Gonzales	11 hr
Mar 20, 8:29 AM CDT	River Flood Warning	EWX	Caldwell, Gonzales	11 hr
Mar 20, 8:29 AM CDT	River Flood Warning	EWX	Gonzales	36 hr
Mar 20, 8:29 AM CDT	River Flood Warning	EWX	DeWitt	36 hr
Mar 20, 10:32 AM CDT	Areal Flood Advisory	EWX	Bastrop	118 min

Nearby

Flash Flood Warnings in Texas, 2012 Every 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.