Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS Austin/San Antonio, TX

February 4, 2012Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Feb 4, 2012, 1:25 AM CST for Travis County, Williamson County, 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: Feb 4, 2012, 1:25 AM CST (07:25 UTC)
Expired: Feb 4, 2012, 4:30 AM CST
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

Counties Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 27 km from the middle of the area, began a volume at 07:28 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
Feb 4, 4:10 AM CST	FLASH FLOOD	3 Wsw Taylor, TX	WEST TEXAS ROAD IN WILLIAMSON COUNTY IS CLOSED DUE TO FLOODING AND TWO HOUSES ON 2ND STREET IN TAYLOR WERE EVACUATED DUE TO WATER WITHIN THE HOMES.

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

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 7.4 hours before the alert went out and 255 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: 1201 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

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

910 
WGUS54 KEWX 040725
FFWEWX
TXC453-491-041030-
/O.NEW.KEWX.FF.W.0013.120204T0725Z-120204T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
125 AM CST SAT FEB 4 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN TRAVIS COUNTY...
  WILLIAMSON COUNTY...

* UNTIL 430 AM CST.

* AT 122 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE   
  FLASH FLOODING ACROSS THE WARNED AREA. AT 118 AM...WILLIAMSON 
  COUNTY LAW ENFORCEMENT REPORTED ONGOING FLASH FLOODING ISSUES 
  OVER EASTERN WILLIAMSON COUNTY NEAR TAYLOR...AND NEW REPORTS OF 
  FLOODING OVER INTERSTATE 35 AT MILE MARKER 274. DOPPLER RADAR
  ESTIMATES AND TRENDS SUGGESTS THAT AN ADDITIONAL 1 TO 3 INCHES
  OF RAIN WILL BE POSSIBLE THROUGH 3 AM.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...AUSTIN...
  CEDAR PARK...GEORGETOWN...GRANGER...PFLUGERVILLE...ROUND ROCK...
  SERENADA...TAYLOR...WINDEMERE...BARTLETT...COUPLAND...GEORGETOWN
  DAM...GRANGER DAM...HUTTO...LEANDER...MANOR...SUN CITY...THRALL AND
  WEIR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.

&&

LAT...LON 3069 9724 3054 9718 3016 9776 3029 9779
      3045 9772 3054 9791 3073 9787 3083 9748

$$

1 follow-up statement

908 
WGUS74 KEWX 040946
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
346 AM CST SAT FEB 4 2012

TXC453-491-041030-
/O.CON.KEWX.FF.W.0013.000000T0000Z-120204T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TRAVIS TX-WILLIAMSON TX-
346 AM CST SAT FEB 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM CST FOR
WILLIAMSON AND EASTERN TRAVIS COUNTIES...

AT 336 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT SHOWERS AND THUNDERSTORMS MOVING OVER THE WARNED AREA OF 
TRAVIS AND WILLIAMSON COUNTIES. ADDITIONAL RAINFALL AMOUNTS SHOULD 
AVERAGE LESS THAN HALF AN INCH AS THE HEAVIER RAINS CONTINUE TO 
SHIFT EAST OF THE AUSTIN METRO AREA. HOWEVER...EXCESSIVE RUNOFF FROM 
THE EARLIER HEAVY RAINS WILL LIKELY CONTINUE TO PRODUCE DANGEROUS 
NIGHTTIME FLOODING...ESPECIALLY NEAR THE TOWN OF TAYLOR AND 
EXTENDING SOUTHWEST INTO THE NORTHEASTERN PART OF THE AUSTIN METRO 
AREA. 

LOCATIONS IN THE WARNING AREA INCLUDE SUN CITY...WEIR...THRALL...
TAYLOR...SERENADA...LEANDER...HUTTO...GRANGER DAM...GRANGER...
GEORGETOWN DAM...GEORGETOWN AND BARTLETT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.

&&

LAT...LON 3069 9724 3054 9718 3016 9776 3029 9779
      3045 9772 3054 9791 3073 9787 3083 9748

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 3, 9:18 PM CST	Areal Flood Advisory	EWX	Bexar	2 hr
Feb 3, 9:45 PM CST	Areal Flood Advisory	EWX	Williamson	105 min
Feb 3, 10:02 PM CST	Flash Flood Warning	EWX	Bexar	118 min
Feb 3, 10:15 PM CST	Severe Thunderstorm Warning	EWX	Bexar	30 min
Feb 3, 10:36 PM CST	Flash Flood Warning	EWX	Williamson	114 min
Feb 3, 10:38 PM CST	Severe Thunderstorm Warning	EWX	Bexar	37 min
Feb 3, 10:51 PM CST	Flash Flood Warning	EWX	Bexar	3 hr
Feb 3, 11:15 PM CST	Severe Thunderstorm Warning	EWX	Bexar, Guadalupe	60 min
Feb 4, 12:15 AM CST	Severe Thunderstorm Warning	EWX	Bexar, Guadalupe, Wilson	45 min
Feb 4, 12:57 AM CST	Areal Flood Advisory	EWX	Burnet	2 hr
Feb 4, 1:07 AM CST	Areal Flood Advisory	EWX	Hays, Travis	113 min
Feb 4, 1:54 AM CST	Areal Flood Advisory	EWX	Bexar, Guadalupe, Wilson	2 hr
Feb 4, 2:32 AM CST	Areal Flood Advisory	EWX	Bandera, Medina	118 min
Feb 4, 2:42 AM CST	Flash Flood Warning	EWX	Hays, Travis	3 hr
Feb 4, 3:11 AM CST	Areal Flood Advisory	EWX	Bandera, Bexar, Medina	109 min
Feb 4, 3:27 AM CST	Areal Flood Advisory	EWX	Bastrop, Caldwell, Hays, Lee, Travis	2 hr
Feb 4, 4:06 AM CST	Areal Flood Advisory	EWX	Bexar, Comal, Guadalupe	114 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.