Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 74, NWS Austin/San Antonio, TX

April 20, 2006Gillespie County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 20, 2006, 2:10 PM CDT for Gillespie County, Texas. It was in force for 80 min. 2 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, 2:10 PM CDT (19:10 UTC)
Expired: Apr 20, 2006, 3:30 PM CDT
In force: 80 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 117 km from the middle of the area, began a volume at 19:14 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, 2:25 PM CDT	HAIL 1	6 S Harper, TX	HAIL COVERING THE GROUND.
Apr 20, 2:55 PM CDT	HAIL 0.5	Fredericksburg, TX	PEA TO MARBLE HAIL COVERING THE GROUND.

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 one storm report to this severe thunderstorm warning; the first came 15 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, 9:30 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 7.2 hours before the alert went out and 208 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: 1378 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 201909
SVREWX
TXC171-202030-
/O.NEW.KEWX.SV.W.0074.060420T1910Z-060420T2030Z/

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

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES...
  GILLESPIE

* UNTIL 330 PM CDT

* AT 203 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED 8 MILES SOUTH OF HARPER...AND MOVING NORTHEAST AT
  30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE LUCKENBACH...
  FREDERICKSBURG...LBJ STATE PARK AND WILLOW CITY.

LAT...LON 3043 9930 3015 9930 3016 9860 3041 9861
      3050 9887

$$

3 follow-up statements

000 
WWUS54 KEWX 201921
SVSEWX

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

TXC171-202030-
/O.CON.KEWX.SV.W.0074.000000T0000Z-060420T2030Z/
GILLESPIE TX-
219 PM CDT THU APR 20 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR GILLESPIE COUNTY...

AT 218 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE SEVERE THUNDERSTORMS OVER WESTERN GILLESPIE COUNTY...MOVING
EAST AT 30 MPH.  NICKEL TO QUARTER SIZE HAIL...WIND GUSTS 40 TO 60 
MPH...BRIEF HEAVY RAIN...AND FREQUENT LIGHTNING WILL ACCOMPANY 
THESE STORMS.  OTHER LOCATIONS IN THE WARNING INCLUDE 
LUCKENBACH...FREDERICKSBURG...LBJ STATE PARK AND WILLOW CITY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM CDT
THURSDAY AFTERNOON FOR SOUTH CENTRAL TEXAS.

LAT...LON 3043 9930 3015 9930 3016 9860 3041 9861
      3050 9887

$$

000 
WWUS54 KEWX 201932
SVSEWX

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

TXC171-202030-
/O.CON.KEWX.SV.W.0074.000000T0000Z-060420T2030Z/
GILLESPIE TX-
230 PM CDT THU APR 20 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR GILLESPIE COUNTY...

AT 230 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE SEVERE THUNDERSTORMS ABOUT 15 MILES WEST OF 
FREDERICKSBURG...MOVING EAST AT 30 MPH.  THESE THUNDERSTORMS 
ARE CAPABLE OF PRODUCING NICKEL TO QUARTER SIZE HAIL...WIND GUSTS 40 
TO 60 MPH...BRIEF HEAVY RAIN...AND FREQUENT LIGHTNING.  THESE
STORMS WILL MOVE OVER GILLESPIE COUNTY IN THE NEXT HOUR.  OTHER
LOCATIONS IN THE WARNING INCLUDE LUCKENBACH...FREDERICKSBURG...LBJ 
STATE PARK AND WILLOW CITY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM CDT
THURSDAY AFTERNOON FOR SOUTH CENTRAL TEXAS.

LAT...LON 3043 9930 3015 9930 3016 9860 3041 9861
      3050 9887

$$

000 
WWUS54 KEWX 201948
SVSEWX

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

TXC171-202030-
/O.CON.KEWX.SV.W.0074.000000T0000Z-060420T2030Z/
GILLESPIE TX-
246 PM CDT THU APR 20 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR GILLESPIE COUNTY...

AT 240 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL AND DAMAGING WINDS.  THIS STORM WAS LOCATED 8 MILES NORTH OF 
FREDERICKSBURG...MOVING EAST AND NORTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE WILLOW CITY.

THIS IS A DANGEROUS STORM.  QUARTER SIZE HAIL COVERING THE GOUND WAS 
REPORTED BY THE FIRE DEPARTMENT IN HARPER IN THE PAST 30 MINUTES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM CDT 
THURSDAY AFTERNOON FOR SOUTH CENTRAL TEXAS AND THE HILL COUNTRY.

LAT...LON 3043 9930 3015 9930 3016 9860 3041 9861
      3050 9887

$$

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, 10:14 AM CDT, 3 hours 56 minutes earlier.

Area forecast discussion, Apr 20, 10:14 AM CDT, 3 hours 56 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1014 AM CDT THU APR 20 2006

.UPDATE...
NOT MAKING ANY CHANGES AT THIS TIME. THE CURRENT SEVERE
THUNDERSTORM WATCH RUNS TIL 4 PM IS COLOCATED WITH THE BETTER
DYNAMICS- FRONTAL BOUNDARY OVER WESTERN HILL COUNTRY, GOOD LOW
LEVEL MOIST INFLOW AND JET FLOW ALOFT.

&&

.PREV DISCUSSION... (ISSUED 642 AM CDT THU APR 20 2006)

AVIATION...
MVFR CIGS WL CONT THRU THIS MRNG. CIGS WL LIFT TO VFR AFTER 17Z,
WITH SOME CLRG ALG THE RIO GRANDE AND DRT AREA. MVFR CIGS WL
RETURN AFTER O8Z. CLUSTER OF RW/TRW OVR NE HILL COUNTRY WILL MOVE
NE ACROSS CENTRAL TX THIS MRNG. RW/TRW WILL REDEVELOP AFT 21Z AND
PERSIST THRU 08Z. SOME TRW MAY BE SVR WITH LARGE HAIL AND DAMAGING
WINDS. A COOL FRONT WILL STALL ACROSS SOUTH CENTRAL TX THIS MRNG
AND THEN LIFT N AFTER 18Z WITH NELY WINDS OF 10 TO 20 KTS ON N
SIDE OF FRONT AND SELY WINDS OF 5 TO 15 KTS ON S OF FRONT.

PREV DISCUSSION... (ISSUED 327 AM CDT THU APR 20 2006)

ACTIVE WEATHER WITH CONTINUED CHANCES OF SHOWERS AND THUNDERSTORMS
WILL PERSIST THROUGH FRIDAY. A SEVERE THUNDERSTORM WATCH HAS
BEEN ISSUED BY SPC FOR OUR FAR WESTERN COUNTIES THIS MORNING
THROUGH 9 AM. FOR THE REMAINDER OF THE DAY...WE REMAIN IN A SLIGHT
RISK FOR SEVERE WEATHER...WHICH COULD BE UPGRADED TO A MODERATE
RISK LATER TODAY. IF SEVERE STORMS OCCUR...THE MAIN THREAT WILL BE
LARGE HAIL...AS WELL AS DAMAGING WINDS.

AN UPPER LEVEL TROUGH AND ASSOCIATED COLD FRONT WILL MOVE THROUGH
THE REGION ON FRIDAY. THIS WILL BRING SLIGHTLY COOLER TEMPERATURES
ONCE AGAIN AND YET MORE CHANCES OF SHOWERS AND
THUNDERSTORMS TO MAINLY OUR SOUTHEASTERN COUNTIES. ONCE AGAIN...WE
REMAIN IN A SLIGHT RISK FOR SEVERE WEATHER.

A RIDGE WILL DOMINATE THE WEATHER FOR THE WEEKEND...INCREASING
THE TEMPERATURES INTO THE 90S. AN UPPER LEVEL DISTURBANCE WILL
BRING SLIGHT CHANCES OF SHOWERS AND THUNDERSTORMS TO THE HILL
COUNTRY SUNDAY AFTERNOON/EVENING INTO EARLY MONDAY. ANOTHER UPPER
TROUGH AND ASSOCIATED FRONT WILL AFFECT THE REGION TUESDAY INTO
WEDNESDAY. THIS WILL MAKE FOR QUITE AN ACTIVE WEATHER PATTERN OVER
THE NEXT WEEK IN SOUTH CENTRAL TEXAS.

&&

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

06/08

Hazardous weather outlook, Apr 20, 5:00 AM CDT, 9 hours 10 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

Special weather statement, Apr 20, 9:16 AM CDT, 4 hours 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
916 AM CDT THU APR 20 2006

TXZ183-201530-
VAL VERDE-
INCLUDING THE CITY OF...DEL RIO
916 AM CDT THU APR 20 2006

...SHOWERS AND THUNDESTORMS OVER VAL VERDE COUNTY...

SCATTERED SHOWERS AND THUNDERSTORMS THROUGH 10 AM OVER
VAL VERDE COUNTY WILL MOVE NORTH AND NORTHEAST AND CAUSE
SOME HAIL AND WIND GUSTS OF 20 TO 40 MPH...AS THEY AFFECT
PARTS OF VAL VERDE COUNTY NORTH OF DEL RIO.  FREQUENT
LIGHTNING IS ALSO EXPECTED.

Local storm report, Apr 20, 10:35 AM CDT, 3 hours 35 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, 2 hours 44 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, 1 hour 57 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, 1 hour 20 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

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, 2:16 PM CDT	Severe Thunderstorm Warning	EWX	Blanco	59 min
Apr 20, 3:21 PM CDT	Severe Thunderstorm Warning	EWX	Blanco	54 min
Apr 20, 3:25 PM CDT	Severe Thunderstorm Warning	EWX	Travis, Williamson	65 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.