Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 77, NWS Austin/San Antonio, TX

April 20, 2006Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 20, 2006, 3:25 PM CDT for Travis County, Williamson County, Texas. It was in force for 65 min. 6 reports 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: Apr 20, 2006, 3:25 PM CDT (20:25 UTC)
Expired: Apr 20, 2006, 4:30 PM CDT
In force: 65 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

Counties Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 50 km from the middle of the area, began a volume at 20:27 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
Apr 20, 3:30 PM CDT	HAIL 0.5	10 Nw Austin, TX	HALF INCH AND LARGE AT THE WESTWOOD HIGH SCHOOL.
Apr 20, 3:30 PM CDT	HAIL 0.5	12 Nw Austin, TX	HALF INCH AND LARGER HAIL AT WESTWOOD HIGH SCHOOL.
Apr 20, 3:30 PM CDT	HAIL 1	Anderson Mill, TX
Apr 20, 3:45 PM CDT	HAIL 1.25	Round Rock, TX
Apr 20, 3:45 PM CDT	HAIL 1.25	Round Rock, TX
Apr 20, 4:37 PM CDT	HAIL 1	4 Ene Round Rock, TX	INTERSECTION OF US HWY 79 AND SH 122.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 5 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 20, 3:24 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.4 hours before the alert went out and 262 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2035 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 62 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 
WUUS54 KEWX 202025
SVREWX
TXC453-491-202130-
/O.NEW.KEWX.SV.W.0077.060420T2025Z-060420T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
325 PM CDT THU APR 20 2006

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES...
  WILLIAMSON
  TRAVIS

* UNTIL 430 PM CDT

* AT 322 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR ANDERSON MILL...AND MOVING NORTHEAST AT 30 
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE GEORGETOWN DAM...
  GEORGETOWN...SERENADA...ROUND ROCK...WINDEMERE...PFLUGERVILLE...
  WEIR...MANOR AND HUTTO.

LAT...LON 3059 9804 3036 9812 3033 9746 3073 9757

$$

1 follow-up statement

000 
WWUS54 KEWX 202058
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
354 PM CDT THU APR 20 2006

TXC453-491-202130-
/O.CON.KEWX.SV.W.0077.000000T0000Z-060420T2130Z/
WILLIAMSON TX-TRAVIS TX-
354 PM CDT THU APR 20 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR TRAVIS AND WILLIAMSON COUNTIES...

AT 354 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORMS OVER WILLIAMSON AND TRAVIS COUNTIES
CAPABLE OF PRODUCING PENNY TO QUARTER SIZE HAIL...WIND GUSTS 30 TO
60 MPH...BRIEF HEAVY RAIN...AND FREQUENT LIGHTNING.  

IN ADDITION...SEVERE THUNDERSTORMS FURTHER WEST IN BLANCO COUNTY
WILL MOVE EAST TOWARD TRAVIS AND WILLIAMSON COUNTIES.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT THURSDAY EVENING
FOR SOUTH CENTRAL TEXAS.

LAT...LON 3059 9804 3036 9812 3033 9746 3073 9757

$$

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 Apr 20, 2:43 PM CDT, 42 minutes earlier.

Area forecast discussion, Apr 20, 2:43 PM CDT, 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
243 PM CDT THU APR 20 2006

.DISCUSSION...
UPPER LOW OVER ROCKIES IS PULLING THE WARM FRONT THROUGH OUR AREA
RIGHT NOW. AS THIS LOW MOVES THROUGH THE PANHANDLE AND OKLAHOMA
TONIGHT, A COLD FRONT WILL DROP SOUTH INTO THE AREA BRINGING A
CONTINUED ROUND OF BENEFICIAL RAIN AND SEVERE THUNDERSTORMS. ON
FRIDAY, THE COLD FRONT SWEEPS ALL AMPLE MOISTURE OUT OF THE AREA
WITH SEASONAL TEMPS FRIDAY AND FRIDAY NIGHT, THEN RISE BACK TO THE
90S NEXT WEEK. THE UPPER RIDGE SLIDES THROUGH TEXAS SATURDAY AND
SUNDAY AS ANOTHER UPPER LOW DROPS INTO THE SOUTHERN ROCKIES.
MOISTURE WILL RETURN ALONG THE RIO GRANDE COUNTIES SATURDAY WITH A
FULL SOUTHEAST FLOW ALL AREAS SATURDAY NIGHT. COULD GET SOME
ADVECTION FOG OVER THE COASTAL PRAIRIES AND INTO THE ESCARPMENT.
PRECIPITABLE WATER VALUES RISE NEXT WEEK AHEAD OF THE NEXT COLD
FRONT TUESDAY NIGHT. THIS FRONT IS E4XPECTED TO GENERATE
SCATTERED SHOWERS AND THUNDERSTORMS WEDNESDAY AND THURSDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              63  85  62  88 /  60  20   0   0
AUSTIN BERGSTROM INTL AIRPORT  63  83  56  87 /  60  20   0   0
DEL RIO INTL AIRPORT           67  89  68  93 /  30  10  10  10
SAN ANTONIO INTL AIRPORT       64  88  64  86 /  50  20   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

06/08

Hazardous weather outlook, Apr 20, 5:00 AM CDT, 10 hours 25 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
500 AM CDT THU APR 20 2006

TXZ171>173-183>194-202>209-217>225-228-211000-
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-
500 AM CDT THU APR 20 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS TODAY AND TONIGHT. SOME OF THE
STORMS COULD BECOME SEVERE. LARGE HAIL AND DAMAGING WINDS WILL BE
THE MAIN THREAT. LOCALLY HEAVY RAINFALL IS POSSIBLE WHERE STORMS
REPEAT ACROSS THE SAME AREAS. ISOLATED TORNADOES ARE POSSIBLE NEAR
A FRONTAL BOUNDARY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A CHANCE OF THUNDERSTORMS ON FRIDAY ACROSS EASTERN
PORTIONS OF SOUTH CENTRAL TEXAS. SOME OF THE STORMS COULD BECOME
SEVERE. LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREAT.
LOCALLY HEAVY RAINFALL IS POSSIBLE WHERE STORMS REPEAT ACROSS THE
SAME AREAS. ISOLATED TORNADOES ARE POSSIBLE NEAR A FRONTAL
BOUNDARY.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND AGAIN
TUESDAY THROUGH WEDNESDAY NIGHT ACROSS PARTS OF SOUTH CENTRAL
TEXAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED TODAY THROUGH FRIDAY.

In the hours before

Local storm report, Apr 20, 10:35 AM CDT, 4 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1035 AM CDT THU APR 20 2006

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

1020 AM     HAIL             2 W LEAKEY              29.72N 99.80W
04/20/2006  M1.00 INCH       REAL               TX   LAW ENFORCEMENT

1018 AM     HAIL             5 E CAMP WOOD           29.67N 99.93W
04/20/2006  M0.88 INCH       REAL               TX   LAW ENFORCEMENT

&&

MCDEWX

Local storm report, Apr 20, 11:26 AM CDT, 3 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1126 AM CDT THU APR 20 2006

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

1121 AM     HAIL             5 NW TARPLEY            29.68N 99.34W
04/20/2006  M1.00 INCH       BANDERA            TX   LAW ENFORCEMENT

            QUARTER SIZE HAIL COVERING THE GROUND.

&&

MCDEWX

Local storm report, Apr 20, 12:13 PM CDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1213 PM CDT THU APR 20 2006

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

1157 AM     HAIL             5 S BANDERA             29.65N 99.07W
04/20/2006  M1.75 INCH       BANDERA            TX   EMERGENCY MNGR

            EMERGENCY MANAGER REPORTED GOLFBALL SIZE HAIL SOUTH OF
            TOWN.

&&

MCDEWX

Local storm report, Apr 20, 12:50 PM CDT, 2 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1250 PM CDT THU APR 20 2006

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

1238 PM     HAIL             7 W COMFORT             29.97N 99.02W
04/20/2006  M0.75 INCH       KERR               TX   LAW ENFORCEMENT

            HAIL REPORTED BETWEEN COMFORT AND CENTER POINT.

&&

PM

Local storm report, Apr 20, 2:42 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
242 PM CDT THU APR 20 2006

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

0225 PM     HAIL             6 S HARPER              30.21N 99.25W
04/20/2006  M1.00 INCH       GILLESPIE          TX   FIRE DEPT/RESCUE

            HAIL COVERING THE GROUND.

&&

PM

Local storm report, Apr 20, 3:10 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
310 PM CDT THU APR 20 2006

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

1200 PM     HAIL             3 E CENTER POINT        29.93N 98.98W
04/20/2006  M1.75 INCH       KERR               TX   CO-OP OBSERVER

            GOLFBALL SIZE HAIL ALONG VERDE CREEK AND GUADALUPE RIVER.

&&

PM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:31 PM CDT	Severe Thunderstorm Warning	EWX	Maverick, Zavala	59 min
Apr 19, 8:00 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	60 min
Apr 19, 8:15 PM CDT	Tornado Warning	EWX	Dimmit	30 min
Apr 19, 8:31 PM CDT	Severe Thunderstorm Warning	EWX	Zavala	59 min
Apr 19, 8:41 PM CDT	Tornado Warning	EWX	Dimmit	34 min
Apr 19, 9:02 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Llano	28 min
Apr 19, 9:10 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina, Zavala	65 min
Apr 19, 9:26 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Llano	34 min
Apr 19, 10:12 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick, Zavala	44 min
Apr 19, 10:12 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick, Zavala	63 min
Apr 20, 2:22 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	53 min
Apr 20, 3:17 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	11 min
Apr 20, 9:04 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kinney	56 min
Apr 20, 9:24 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	66 min
Apr 20, 9:55 AM CDT	Severe Thunderstorm Warning	EWX	Real	50 min
Apr 20, 10:20 AM CDT	Severe Thunderstorm Warning	EWX	Bandera	55 min
Apr 20, 10:42 AM CDT	Severe Thunderstorm Warning	EWX	Real	33 min
Apr 20, 10:56 AM CDT	Tornado Warning	EWX	Bandera	19 min
Apr 20, 11:10 AM CDT	Severe Thunderstorm Warning	EWX	Bandera	65 min
Apr 20, 11:49 AM CDT	Severe Thunderstorm Warning	EWX	Kendall, Kerr	71 min
Apr 20, 1:01 PM CDT	Severe Thunderstorm Warning	EWX	Edwards	44 min
Apr 20, 1:28 PM CDT	Tornado Warning	EWX	Kerr	17 min
Apr 20, 1:43 PM CDT	Severe Thunderstorm Warning	EWX	Kerr	62 min
Apr 20, 2:10 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	80 min
Apr 20, 2:16 PM CDT	Severe Thunderstorm Warning	EWX	Blanco	59 min
Apr 20, 3:21 PM CDT	Severe Thunderstorm Warning	EWX	Blanco	54 min
Apr 20, 3:28 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	32 min
Apr 20, 3:40 PM CDT	Tornado Warning	EWX	Blanco	35 min
Apr 20, 3:53 PM CDT	Severe Thunderstorm Warning	EWX	Hays	67 min
Apr 20, 4:11 PM CDT	Severe Thunderstorm Warning	EWX	Blanco	34 min
Apr 20, 4:29 PM CDT	Severe Thunderstorm Warning	EWX	Travis, Williamson	76 min
Apr 20, 4:32 PM CDT	Severe Thunderstorm Warning	EWX	Comal	58 min
Apr 20, 4:44 PM CDT	Flash Flood Warning	EWX	Travis	3 hr
Apr 20, 5:06 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Guadalupe, Hays	24 min
Apr 20, 5:15 PM CDT	Tornado Warning	EWX	Caldwell, Guadalupe	30 min
Apr 20, 5:20 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee	55 min
Apr 20, 5:36 PM CDT	Tornado Warning	EWX	Caldwell	39 min
Apr 20, 5:37 PM CDT	Severe Thunderstorm Warning	EWX	Llano	23 min
Apr 20, 5:56 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	34 min
Apr 20, 6:07 PM CDT	Tornado Warning	EWX	Bastrop, Caldwell	23 min
Apr 20, 6:16 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	44 min
Apr 20, 6:25 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop	65 min

Nearby

Severe Thunderstorm Warnings in Texas, 2006 Every severe thunderstorm warning in 2006

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.