Alert archive / Texas / Flash Flood Warnings in 2011

Flash Flood Warning 7, NWS Austin/San Antonio, TX

October 9, 2011Burnet County, Llano County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Oct 9, 2011, 4:25 AM CDT 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: Oct 9, 2011, 4:25 AM CDT (09:25 UTC)
Expired: Oct 9, 2011, 7:30 AM CDT
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), 92 km from the middle of the area, began a volume at 09:27 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
Oct 9, 6:00 AM CDT	FLASH FLOOD	6 Ne Llano, TX	FM221 CLOSED DUE TO FLOODING

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, 9.4 hours before the alert went out and 242 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: 238 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1137 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 277 m²/s²
0-3 km storm-relative helicity: 427 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

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

621 
WGUS54 KEWX 090925
FFWEWX
TXC053-299-091230-
/O.NEW.KEWX.FF.W.0007.111009T0925Z-111009T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
425 AM CDT SUN OCT 9 2011

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 730 AM CDT.

* AT 420 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE SLOW
  MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS MUCH OF LLANO
  AND BURNET COUNTY. RAINFALL AMOUNTS OVER CENTRAL AND NORTHERN      
  LLANO COUNTY HAVE ALREADY REACHED BETWEEN 4 AND 1/2 INCHES AND 5 
  INCHES. RAINFALL AMOUNTS OF 4 TO 6 INCHES WILL BE POSSIBLE ACROSS 
  AREAS ALONG AND NORTH OF HIGHWAY 71 OVER LLANO AND BURNET COUNTY 
  THROUGH 6 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...BRIGGS...GAINESVILLE...GRANITE
  SHOALS...HORSESHOE BAY...INKS LAKE STATE PARK...JOPPA...LAKE
  VICTOR...LONE GROVE...MEADOWLAKES...OATMEAL...OXFORD...SHADY
  GROVE...SMITHWICK...SPICEWOOD...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 3104 9790 3091 9784 3078 9797 3044 9815
      3051 9840 3051 9883 3092 9883 3093 9879
      3093 9843 3095 9846 3102 9846 3103 9844

$$

1 follow-up statement

024 
WGUS74 KEWX 091048
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
548 AM CDT SUN OCT 9 2011

TXC053-299-091230-
/O.CON.KEWX.FF.W.0007.000000T0000Z-111009T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LLANO TX-BURNET TX-
548 AM CDT SUN OCT 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT FOR
BURNET AND LLANO COUNTIES...

AT 536 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT A THUNDERSTORM COMPLEX PRODUCING FLASH FLOODING RAINS OVER 
MUCH OF LLANO AND BURNET COUNTIES.

SINCE MIDNIGHT...NUMEROUS RAINFALL REPORTS ALONG AND NORTH OF 
HIGHWAY 71 WERE IN THE 3 TO 5 INCH RANGE. MODERATE TO OCCASIONALLY 
HEAVY RAINFALL RATES OF ONE-HALF TO ONE INCH WILL CONTINUE TO FALL 
OVER MUCH OF LLANO AND BURNET COUNTY THROUGH AT LEAST 7 AM.

LOCATIONS IN THE WARNING AREA INCLUDE SUNNYLANE...LAKE VICTOR...
WATSON...BABY HEAD...TOW AND BRIGGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE WHERE WATER COVERS THE ROAD. EVEN SUVS AND PICKUPS WILL
BE SWEPT AWAY BY AS LITTLE AS TWO FEET OF RUSHING WATER. TURN AROUND
DON'T DROWN.

&&

LAT...LON 3104 9790 3091 9784 3078 9797 3044 9815
      3051 9840 3051 9883 3092 9883 3093 9879
      3093 9843 3095 9846 3102 9846 3103 9844

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 7:46 PM CDT	Areal Flood Advisory	EWX	Edwards, Val Verde	104 min
Oct 8, 9:29 PM CDT	Areal Flood Advisory	EWX	Edwards, Val Verde	2 hr
Oct 8, 11:15 PM CDT	Areal Flood Advisory	EWX	Bandera, Edwards, Kerr, Medina, Real, Uvalde	105 min
Oct 8, 11:28 PM CDT	Areal Flood Advisory	EWX	Maverick	2 hr
Oct 9, 12:49 AM CDT	Areal Flood Advisory	EWX	Bandera, Frio, Gillespie, Kendall, Kerr, Llano and 1 more	3 hr
Oct 9, 1:35 AM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Blanco, Burnet, Comal, Gillespie and 3 more	3 hr
Oct 9, 2:38 AM CDT	Flash Flood Warning	EWX	Bexar, Comal, Kendall	3 hr
Oct 9, 3:02 AM CDT	Flash Flood Watch	EWX	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 14 more	12 hr
Oct 9, 3:21 AM CDT	Areal Flood Advisory	EWX	Bexar, Comal, Guadalupe, Hays, Kendall	2 hr
Oct 9, 3:28 AM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Comal, Hays, Kendall, Travis and 1 more	3 hr
Oct 9, 3:41 AM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal, Guadalupe	34 min
Oct 9, 4:04 AM CDT	Flash Flood Warning	EWX	Comal, Hays	3 hr
Oct 9, 5:13 AM CDT	Flash Flood Warning	EWX	Burnet, Travis, Williamson	3 hr
Oct 9, 5:41 AM CDT	Areal Flood Advisory	EWX	Bexar	3 hr
Oct 9, 6:21 AM CDT	Areal Flood Advisory	EWX	Dimmit, Maverick, Zavala	3 hr
Oct 9, 8:04 AM CDT	Areal Flood Advisory	EWX	Travis, Williamson	116 min
Oct 9, 10:33 AM CDT	Areal Flood Advisory	EWX	Atascosa, Bexar, Comal, Guadalupe, Wilson	117 min

Nearby

Flash Flood Warnings in Texas, 2011 Every flash flood warning in 2011

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.