Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 23, NWS Austin/San Antonio, TX

March 20, 20129 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Mar 20, 2012, 2:24 AM CDT for 9 counties in Texas. It was in force for 3 hr. 6 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 20, 2012, 2:24 AM CDT (07:24 UTC)
Expired: Mar 20, 2012, 5:30 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

Counties Bastrop County, TX, Caldwell County, TX, DeWitt County, TX, Fayette County, TX, Gonzales County, TX, Guadalupe County, TX, Karnes County, TX, Lee County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 71 km from the middle of the area, began a volume at 07:26 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

Time	Report	Where	Remark
Mar 20, 3:30 AM CDT	FLASH FLOOD	Seguin, TX	LOCAL RDS CLOSED INCLUDING WEIR LN... SH123 AT CORDOVA... ZUEHL CROSSING AT CIBOLO CK... REDWOOD RD.
Mar 20, 4:00 AM CDT	FLASH FLOOD	1 N Bastrop, TX	NUMEROUS LOW WATER CROSSING CLOSED IS MORNING AND SOME TREE LIMBS IN THE ROAD.
Mar 20, 4:30 AM CDT	FLASH FLOOD	4 E Gonzales, TX	RAPID RISES OF WATER OVER ROADWAYS ON FM532 AND FM1680. DENTON CREEK SPILLING OVER.
Mar 20, 4:30 AM CDT	FLASH FLOOD	5 W Gonzales, TX	NUMEROUS RAODS CLOSED DUE TO FLOODING... INCLUDING HIGHWAYS 1680 AND 532.
Mar 20, 4:45 AM CDT	FLASH FLOOD	5 N Lexington, TX	LOW WATER CROSSINGS CLOSED NEAR HIGHWAY 216 AND 334.
Mar 20, 5:00 AM CDT	FLASH FLOOD	Cedar Creek, TX	JENKIINS RD. ANSD CR 1764 AND FM 535 ARE CLOSED DUE TO HIGH WATER.

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, 7.4 hours before the alert went out and 229 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.

010 
WGUS54 KEWX 200724
FFWEWX
TXC021-055-123-149-177-187-255-287-493-201030-
/O.NEW.KEWX.FF.W.0023.120320T0724Z-120320T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BASTROP COUNTY...
  CALDWELL COUNTY...
  WEST CENTRAL DEWITT COUNTY...
  FAYETTE COUNTY...
  GONZALES COUNTY...
  GUADALUPE COUNTY...
  KARNES COUNTY...
  LEE COUNTY...
  WILSON COUNTY...

* UNTIL 530 AM CDT.

* AT 221 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE 
  THUNDERSTORMS WITH VERY HEAVY RAIN MOVING EAST OF THE I35 
  CORRIDOR. PROJECTED RAINFALL RAINFALL AMOUNTS OF 1 TO 2 INCHES
  CAN BE EXPECTED IN ONE HOUR OR LESS AS THIS LINE OF STORMS 
  WITH VERY HEAVY RAINS MOVES EASTWARD.  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BASTROP...
  FLATONIA...FLORESVILLE...GIDDINGS...GONZALES...KARNES CITY...
  KOSCIUSKO...LA GRANGE...LEXINGTON...LOCKHART...LULING...POTH...
  SEGUIN...SMITHVILLE...STOCKDALE...CAMP SWIFT...CEDAR CREEK...
  CESTOHOWA...CIRCLE D-KC ESTATE...CISTERN...DIME BOX...FALLS CITY...
  FEDOR...FENTRESS...GERONIMO...GILLETT...KINGSBURY...LA VERNIA...
  MCQUEENEY AND MULDOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2963 9711 2958 9721 2953 9720 2943 9729
      2878 9792 2901 9831 2912 9840 2948 9812
      2949 9817 3045 9721 3053 9702 3043 9683
      3033 9674 3030 9664 3016 9678 3016 9666
      3012 9664

$$

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, 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, 5:11 AM CDT	Flash Flood Warning	EWX	Bastrop, Blanco, Burnet, Caldwell, Comal, Guadalupe and 4 more	3 hr
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; radar from the NEXRAD Level II archive.