Alert archive / Texas / Wind Advisories in 2009

Wind Advisory 4, NWS Austin/San Antonio, TX

February 21, 200922 counties in Texas

NWS Austin/San Antonio, TX issued this wind advisory at Feb 21, 2009, 9:21 AM CST for 22 counties in Texas. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued
Feb 21, 2009, 9:21 AM CST (15:21 UTC)
Expired
Feb 21, 2009, 8:00 PM CST
In force
11 hr
Issued by
NWS Austin/San Antonio, TX
All 22 counties

Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Edwards County, TX, Gillespie County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lee County, TX, Llano County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX

The radar

The Austin/San Antonio radar (KEWX), 75 km from the middle of the area, began a volume at 15:22 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

Del Rio, TX (KDRT), launched 12:00Z, 3.4 hours before the alert went out and 215 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, Del Rio, TX at 12:00Z on 2009-02-21Temperature 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, Del Rio, TX at 12:00Z on 2009-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 square meters per square second.19395878Sfc1 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
728 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
240 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.

000 
WWUS74 KEWX 211521
NPWEWX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
921 AM CST SAT FEB 21 2009

...WIND ADVISORY IN EFFECT THROUGH THIS EVENING FOR THE HILL
COUNTRY AND ADJACENT AREAS OF SOUTH CENTRAL TEXAS...

.A COLD FRONT WILL SWEEP SOUTHEASTWARD ACROSS SOUTH CENTRAL TEXAS
AND THE HILL COUNTRY TODAY. STRONG NORTHWEST WINDS OF 20 TO 30 MPH
WITH GUSTS OF 35 MPH WILL OCCUR BEHIND THE FRONT. WINDS WILL DIMINISH
THIS EVENING.

TXZ171>173-183>194-202>208-220200-
/O.NEW.KEWX.WI.Y.0004.090221T1521Z-090222T0200Z/
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-
INCLUDING THE CITIES OF...LLANO...BURNET...GEORGETOWN...DEL RIO...
ROCKSPRINGS...LEAKEY...KERRVILLE...BANDERA...FREDERICKSBURG...
BOERNE...BLANCO...SAN MARCOS...AUSTIN...BASTROP...GIDDINGS...
BRACKETTVILLE...UVALDE...HONDO...SAN ANTONIO...NEW BRAUNFELS...
SEGUIN...LOCKHART
921 AM CST SAT FEB 21 2009

...WIND ADVISORY IN EFFECT UNTIL 8 PM CST THIS EVENING...

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
WIND ADVISORY...WHICH IS IN EFFECT UNTIL 8 PM CST THIS EVENING. 

THE WIND ADVISORY IS ALONG AND NORTH OF A LINE FROM DEL RIO TO SAN
ANTONIO TO GIDDINGS. NORTHWEST WINDS OF 20 TO 30 MPH WITH GUSTS
OF 35 MPH WILL OCCUR FOLLOWING THE PASSAGE OF A COLD FRONT.

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 26 TO 39 MPH ARE
EXPECTED. WINDS THIS STRONG CAN MAKE DRIVING DIFFICULT...
ESPECIALLY FOR HIGH PROFILE VEHICLES. USE EXTRA CAUTION.

DUE TO THE STRONG NORTHWEST WINDS...ANY FIRES THAT DO OCCUR...WILL
BE DIFFICULT TO CONTROL AND CONTAIN.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 21, 9:46 AM CSTRed Flag WarningEWXEdwards, Kinney, Real, Uvalde, Val Verde8 hr

Nearby

Wind Advisories in Texas, 2009Every wind advisory in 2009

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.