Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 156, NWS Austin/San Antonio, TX

October 1, 2009Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Oct 1, 2009, 9:42 PM CDT for Travis County, Williamson County, Texas. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 1, 2009, 9:42 PM CDT (02:42 UTC)
Expired: Oct 1, 2009, 10:30 PM CDT
In force: 48 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 39 km from the middle of the area, began a volume at 02:42 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 00:00Z, 2.7 hours before the alert went out and 263 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: 411 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1408 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 1, 9:36 PM CDT, 6 minutes earlier.

Area forecast discussion, Oct 1, 9:36 PM CDT, 6 minutes before

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Hazardous weather outlook, Oct 1, 3:09 PM CDT, 6 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
309 PM CDT THU OCT 1 2009

TXZ171>173-183>194-202>209-217>225-228-022015-
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA-
FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT-
309 PM CDT THU OCT 1 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT THAT WILL MOVE
SOUTHWARD INTO THE NORTHEASTERN HILL COUNTRY AND ESCARPMENT
TONIGHT. THERE IS A SLIGHT RISK OF THESE STORMS BECOMING SEVERE
WITH DAMAGING WINDS BEING THE MAIN THREAT.

.DAYS TWO THROUGH FIVE...FRIDAY THROUGH MONDAY...

LATE SATURDAY INTO SUNDAY THERE WILL BE THE POTENTIAL FOR HEAVY
RAIN WITH AMOUNTS GENERALLY 1-3 INCHES WITH LOCALLY HIGHER
AMOUNTS.

.DAYS SIX AND SEVEN...TUESDAY AND WEDNESDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Oct 1, 8:39 PM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
839 PM CDT THU OCT 01 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0833 PM     HAIL             9 N BRIGGS              31.00N  97.92W
10/01/2009  E0.75 INCH       BURNET             TX   TRAINED SPOTTER

            NEAR OAKALLA

0833 PM     TSTM WND GST     9 N BRIGGS              31.00N  97.92W
10/01/2009  E50 MPH          BURNET             TX   TRAINED SPOTTER

            NEAR OAKALLA

&&

EVENT NUMBER EWX0900106
EVENT NUMBER EWX0900107

JPB

Local storm report, Oct 1, 8:44 PM CDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
844 PM CDT THU OCT 01 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0840 PM     TSTM WND GST     FLORENCE                30.84N  97.79W
10/01/2009  M80 MPH          WILLIAMSON         TX   AMATEUR RADIO

            SOME DAMAGE REPORTED. EXTENT UNKNOWN

&&

EVENT NUMBER EWX0900108

JPB

Local storm report, Oct 1, 9:05 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
905 PM CDT THU OCT 01 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0859 PM     HAIL             BURNET                  30.76N  98.23W
10/01/2009  E0.75 INCH       BURNET             TX   CO-OP OBSERVER

&&

EVENT NUMBER EWX0900109

JPB

Local storm report, Oct 1, 9:09 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
909 PM CDT THU OCT 01 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0903 PM     TSTM WND GST     BURNET                  30.76N  98.23W
10/01/2009  M52 MPH          BURNET             TX   ASOS

&&

EVENT NUMBER EWX0900110

JPB

Local storm report, Oct 1, 9:11 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
911 PM CDT THU OCT 01 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0839 PM     TSTM WND GST     FLORENCE                30.84N  97.79W
10/01/2009  M62 MPH          WILLIAMSON         TX   FIRE DEPT/RESCUE

            FIRE STATION

&&

EVENT NUMBER EWX0900111

JPB

Local storm report, Oct 1, 9:17 PM CDT, 25 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 1, 8:16 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	44 min
Oct 1, 8:33 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Williamson	42 min
Oct 1, 8:49 PM CDT	Severe Thunderstorm Warning	EWX	Kerr	41 min
Oct 1, 9:04 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Travis, Williamson	41 min
Oct 1, 9:13 PM CDT	Severe Thunderstorm Warning	EWX	Williamson	26 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning 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.