Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 16, NWS Austin/San Antonio, TX

February 17, 2012Burnet County, Llano County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Feb 17, 2012, 11:05 PM CST for Burnet County, Llano 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 17, 2012, 11:05 PM CST (05:05 UTC)
Expired
Feb 18, 2012, 2:00 AM CST
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Flood severity
None

Counties Burnet County, TX, Llano County, TX

The radar

The Ft Hood radar (KGRK), 100 km from the middle of the area, began a volume at 05:06 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
Feb 18, 1:50 AM CSTFLASH FLOODLlano, TXROAD CLOSURES DUE TO HIGH WATER... WEST SANDSTONE RD... RR 2323 3 MI SOUTHWEST OF LLANO

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, 5.1 hours before the alert went out and 244 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, Fort Worth, TX at 00:00Z on 2012-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Fort Worth, TX at 00:00Z on 2012-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1062 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
130 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.

324 
WGUS54 KEWX 180505
FFWEWX
TXC053-299-180800-
/O.NEW.KEWX.FF.W.0016.120218T0505Z-120218T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1105 PM CST FRI FEB 17 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BURNET COUNTY...
  LLANO COUNTY...

* UNTIL 200 AM CST.

* AT 1103 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE SLOW
  MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED    
  AREA. RADAR ESTIMATES SHOW RAINFALL UP TO ONE AND ONE HALF INCHES  
  OVER THE CENTRAL PORTIONS OF LLANO AND BURNET COUNTIES. AN         
  ADDITIONAL ONE TO TWO INCHES IS LIKELY BY 2 AM.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BERTRAM...BUCHANAN DAM...BURNET...KINGSLAND...LLANO...MARBLE
  FALLS...BABY HEAD...BLUFFTON...GAINESVILLE...GRANITE SHOALS...
  HORSESHOE BAY...INKS LAKE STATE PARK...JOPPA...LAKE VICTOR...LONE
  GROVE...MEADOWLAKES...OATMEAL...OXFORD...SHADY GROVE...SMITHWICK...
  STOLZ...SUNNYLANE...TOW AND WATSON.

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 3096 9789 3050 9816 3054 9876 3071 9891
      3089 9874 3094 9860 3094 9845 3095 9846
      3099 9845 3103 9833

$$
1 follow-up statement
589 
WGUS74 KEWX 180755
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
155 AM CST SAT FEB 18 2012

TXC053-299-180803-
/O.EXP.KEWX.FF.W.0016.000000T0000Z-120218T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LLANO TX-BURNET TX-
155 AM CST SAT FEB 18 2012

...THE FLASH FLOOD WARNING FOR BURNET AND LLANO COUNTIES WILL BE 
ALLOWED TO EXPIRE AT 200 AM CST...

THE STRONGEST STORMS AND HEAVIEST RAINFALL HAVE MOVED OUT OF THE 
WARNING AREA. HOWEVER...SCATTERED SHOWERS AND THUNDERSTORMS ARE 
EXPECTED TO CONTINUE THROUGH EARLY THIS MORNING...AND MAY PRODUCE 
ADDITIONAL HEAVY RAINFALL OVER AREAS WHICH ARE ALREADY SATURATED 
FROM STORMS EARLIER TONIGHT. 

LAT...LON 3096 9789 3050 9816 3054 9876 3071 9891
      3089 9874 3094 9860 3094 9845 3095 9846
      3099 9845 3103 9833

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 17, 10:42 PM CSTAreal Flood AdvisoryEWXMaverick108 min
Feb 17, 10:52 PM CSTFlash Flood WarningEWXBexar4 hr
Feb 18, 12:41 AM CSTAreal Flood AdvisoryEWXBandera, Blanco, Gillespie, Kendall, Kerr109 min
Feb 18, 1:04 AM CSTFlash Flood WarningEWXTravis, Williamson4 hr
Feb 18, 7:28 AM CSTAreal Flood AdvisoryEWXBexar2 hr
Feb 18, 8:34 AM CSTAreal Flood AdvisoryEWXBastrop, Caldwell, Comal, Hays, Travis116 min
Feb 18, 9:03 AM CSTAreal Flood AdvisoryEWXFayette117 min
Feb 18, 10:02 AM CSTAreal Flood AdvisoryEWXWilliamson118 min
Feb 18, 11:20 AM CSTAreal Flood AdvisoryEWXBastrop2 hr
Feb 18, 3:54 PM CSTAreal Flood AdvisoryEWXBastrop2 hr

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.