Alert archive / Texas / Red Flag Warnings in 2011

Red Flag Warning 23, NWS Austin/San Antonio, TX

September 25, 20118 counties in Texas

NWS Austin/San Antonio, TX issued this red flag warning at Sep 25, 2011, 10:40 AM CDT for 8 counties in Texas. It took effect at Sep 25, 2011, 1:00 PM CDT. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 25, 2011, 10:40 AM CDT (15:40 UTC)
In effect from: Sep 25, 2011, 1:00 PM CDT
Expired: Sep 25, 2011, 9:00 PM CDT
In force: 8 hr
Issued by: NWS Austin/San Antonio, TX

Counties Bastrop County, TX, Blanco County, TX, Burnet County, TX, Hays County, TX, Lee County, TX, Llano County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 59 km from the middle of the area, began a volume at 15:42 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.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 3.7 hours before the alert went out and 276 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: 18 J/kg
Mixed-layer CIN: -673 J/kg
Mixed-layer LCL: 2450 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 297 m²/s²
0-3 km storm-relative helicity: 387 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.

210 
WWUS84 KEWX 251540
RFWEWX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1040 AM CDT SUN SEP 25 2011

...RED FLAG WARNING IN EFFECT FROM 1 PM TO 9 PM CDT SUNDAY FOR
STRONG WINDS AND LOW RELATIVE HUMIDITIES ACROSS THE NORTHEASTERN
PORTIONS OF SOUTH CENTRAL TEXAS INCLUDING THE AUSTIN METRO AREA...

.STRONG AND GUSTY SOUTHWESTERLY WINDS AHEAD OF AN APPROACHING
SURFACE FRONT WILL COUPLE WITH LOW RELATIVE HUMIDITIES DURING THE
EARLY AFTERNOON HOURS SUNDAY. THIS COUPLING WILL RESULT IN
CRITICAL FIRE WEATHER CONDITIONS ALONG AND NORTH OF A LLANO TO SAN
MARCOS TO GIDDINGS LINE. WINDS ALONG AND BEHIND THE FRONT WILL BE
VARIABLE BUT MAINLY FROM THE NORTH AND NOT AS STRONG AS WINDS AHEAD
OF THE FRONT. ELEVATED TO NEAR CRITICAL FIRE WEATHER CONDITIONS
ARE EXPECTED ACROSS THE REMAINDER OF SOUTH CENTRAL TEXAS THIS
AFTERNOON.

TXZ171>173-190>194-260200-
/O.NEW.KEWX.FW.W.0023.110925T1800Z-110926T0200Z/
LLANO-BURNET-WILLIAMSON-BLANCO-HAYS-TRAVIS-BASTROP-LEE-
1040 AM CDT SUN SEP 25 2011

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 9 PM
CDT THIS EVENING FOR STRONG WINDS AND LOW RELATIVE HUMIDITIES
ACROSS THE NORTHEASTERN PORTIONS OF SOUTH CENTRAL TEXAS INCLUDING
THE AUSTIN METRO AREA...

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
RED FLAG WARNING...WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO
9 PM CDT THIS EVENING. 

* AFFECTED AREA...THE FOLLOWING SOUTH CENTRAL TEXAS COUNTIES... 
  LLANO...BURNET...WILLIAMSON...BLANCO...HAYS...TRAVIS... 
  BASTROP...LEE. 

* 20-FOOT WIND...15 TO 20 MPH WITH HIGHER GUSTS.

* HUMIDITY...15 TO 25 PERCENT. 

* THUNDERSTORMS...NONE.

* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. 
  OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY.  AVOID THE USE OF
OPEN FLAMES OR ANY ACTIVITIES THAN MAY GENERATE SPARKS. 
ACCIDENTAL IGNITIONS WILL HAVE THE POTENTIAL TO GROW QUICKLY INTO
DANGEROUS WIND DRIVEN WILDFIRES.

&&

$$


FOR INFORMATION ON BURN BANS PLEASE VISIT THE TEXAS INTERAGENCY
COORDINATION CENTER WEBSITE AT: TICC.TAMU.EDU

Nearby

Red Flag Warnings in Texas, 2011 Every red flag 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.