Alert archive / Texas / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 48, NWS Austin/San Antonio, TX

April 6, 2004Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 6, 2004, 4:08 AM CDT for Williamson County, Texas. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 6, 2004, 4:08 AM CDT (09:08 UTC)
Expired: Apr 6, 2004, 5:15 AM CDT
In force: 67 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Williamson County, TX

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 5, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 9.1 hours before the alert went out and 248 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: 1786 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 93 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.

708 
WUUS54 KEWX 060908
SVRSAT
TXC491-061015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
408 AM CDT TUE APR 6 2004

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  WILLIAMSON

* UNTIL 515 AM CDT

* AT 408 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES SOUTHWEST OF LEANDER...OR ABOUT 9 MILES
  WEST OF CEDAR PARK...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  3 MILES SOUTH OF LEANDER AT 420 AM
  4 MILES NORTH OF ROUND ROCK AT 435 AM
  5 MILES SOUTH OF GEORGETOWN AT 440 AM
  4 MILES SOUTH OF WEIR AT 455 AM
  4 MILES SOUTH OF GRANGER AT 510 AM

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.


LAT...LON 3063 9794 3046 9778 3058 9726 3081 9747

$$

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 6, 3:34 AM CDT, 34 minutes earlier.

Area forecast discussion, Apr 6, 3:34 AM CDT, 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
300 AM CDT TUE APR  6 2004

.DISCUSSION...BROKEN LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN
ACROSS THE HILL COUNTRY WITH NORTHERN SECTION TO MOVE INTO AUSTIN
AREA AROUND 4 AM. SOUTHERN PART OF LINE MOVING MORE SLOWLY AND
SHOULD MOVE INTO SAN ANTONIO AREA AROUND 5 TO 530 AM MAKING FOR A
DIFFICULT START OF THE MORNING RUSH. THE MESO ETA MODEL HANDLING
SPEED OF THE LINE BETTER THAN GFS BUT STILL A BIT SLOW.  LINE SHOULD
MOVE ACROSS REST OF THE CWA BY MID AFTERNOON AND WILL EXTEND FFA
UNTIL 2 PM.  MINOR DISTURBANCE TO BRING CHANCE POPS EAST TONIGHT.
UPPER LOW FINALLY MOVES NORTHEAST WITH BETTER WEATHER WEDNESDAY
THROUGH FRIDAY.  COLD FRONT RACES THROUGH STATE SATURDAY WITH TEMPS
DROPPING BELOW SEASONAL NORMALS SUNDAY AND MONDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              76  57  81  57 /  80  30   0   0
AUSTIN BERGSTROM INTL AIRPORT  76  57  81  55 /  80  30   0   0
DEL RIO INTL AIRPORT           80  59  84  59 /  50   0   0   0
SAN ANTONIO INTL AIRPORT       77  59  81  60 /  80  20   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...FLOOD WATCH FOR FLASH FLOODING
FOR ALL BUT EXTREME NORTHWEST PORTION OF SOUTH CENTRAL TEXAS AND THE
HILL COUNTRY UNTIL 2 PM CDT.

&&

03/06

Hazardous weather outlook, Apr 5, 4:00 PM CDT, 12 hours 8 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
400 PM CDT MON APR 5 2004

TXZ171>173-183>194-202>209-217>225-228-061000-
ATASCOSA-BANDERA-BASTROP-BEXAR-BLANCO-BURNET-CALDWELL-COMAL-DEWITT-
DIMMIT-EDWARDS-FAYETTE-FRIO-GILLESPIE-GONZALES-GUADALUPE-HAYS-KARNES-
KENDALL-KERR-KINNEY-LAVACA-LEE-LLANO-MAVERICK-MEDINA-REAL-TRAVIS-
UVALDE-VAL VERDE-WILLIAMSON-WILSON-ZAVALA-
400 PM CDT MON APR 5 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TODAY AND TONIGHT.
A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 AM CDT TUESDAY MORNING.
ADDITIONAL HEAVY RAINFALL TONIGHT WILL AVERAGE ONE HALF TO NEAR 2
INCHES WITH ISOLATED AMOUNTS OF 2 TO 4 INCHES.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS ALL OF
THE TEXAS HILL COUNTRY AND SOUTH CENTRAL TEXAS LATE THIS EVENING AND
INTO THE EARLY MORNING HOURS.  LARGE HAIL NEAR 2 INCHES IN DIAMETER
AND WINDS GUSTS TO NEAR 60 MPH WILL BE THE PRIMARY SEVERE WEATHER
THREAT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THE THREAT OF HEAVY RAIN WILL DECREASE TUESDAY AFTERNOON AND END
TUESDAY NIGHT AS THE UPPER LEVEL STORM SYSTEMS MOVES OFF TO THE
NORTHEAST.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED THIS THIS EVENING.

In the hours before

Local storm report, Apr 5, 11:38 PM CDT, 4 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1138 PM CDT MON APR 05 2004

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

1120 PM     HAIL             2 S ROCKSPRINGS         29.99N 100.21W
04/05/2004  0.75 INCH        EDWARDS            TX   TRAINED SPOTTER

            3 TO 4 INCHES DEEP

&&

JPB

Local storm report, Apr 6, 2:37 AM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
237 AM CDT TUE APR 06 2004

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

1235 AM     FLASH FLOOD      LOMA ALTA               29.92N 100.77W
04/06/2004                   VAL VERDE          TX   LAW ENFORCEMENT

            HWY 277 FLOODED

1242 AM     BLIZZARD         ROCKSPRINGS             30.02N 100.21W
04/06/2004                   EDWARDS            TX   LAW ENFORCEMENT

            HIGHWAYS 377 AND 674 CLOSED

0210 AM     FLASH FLOOD      ROCKSPRINGS             30.02N 100.21W
04/06/2004                   EDWARDS            TX   LAW ENFORCEMENT

            HIGHWAYS 41, 55S, 335 CLOSED

0218 AM     FLASH FLOOD      19 W MOUNTAIN HOME      30.17N 99.68W
04/06/2004                   KERR               TX   LAW ENFORCEMENT

            HIGHWAY 41 3 MILES EAST OF HIGHWAY 41 CLOSED

&&

DC

Local storm report, Apr 6, 2:42 AM CDT, 1 hour 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
242 AM CDT TUE APR 06 2004

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

1235 AM     FLASH FLOOD      LOMA ALTA               29.92N 100.77W
04/06/2004                   VAL VERDE          TX   LAW ENFORCEMENT

            HWY 277 FLOODED

1242 AM     FLASH FLOOD      ROCKSPRINGS             30.02N 100.21W
04/06/2004                   EDWARDS            TX   LAW ENFORCEMENT

            HIGHWAYS 377 AND 674 CLOSED

0210 AM     FLASH FLOOD      ROCKSPRINGS             30.02N 100.21W
04/06/2004                   EDWARDS            TX   LAW ENFORCEMENT

            HIGHWAYS 41, 55S, 335 CLOSED

0218 AM     FLASH FLOOD      19 W MOUNTAIN HOME      30.17N 99.68W
04/06/2004                   KERR               TX   LAW ENFORCEMENT

            HIGHWAY 41 3 MILES EAST OF HIGHWAY 41 CLOSED

&&

DC

Local storm report, Apr 6, 3:06 AM CDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
306 AM CDT TUE APR 06 2004

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

0240 AM     FLASH FLOOD      27 N DEL RIO            29.77N 100.90W
04/06/2004                   VAL VERDE          TX   LAW ENFORCEMENT

            JUNCTION OF HIGHWAYS 277 AND 377 CLOSED

&&

DC

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 9:37 PM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
Apr 5, 9:37 PM CDT	Flash Flood Warning	EWX	Kendall, Val Verde	3 hr
Apr 5, 10:09 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	66 min
Apr 5, 10:43 PM CDT	Flash Flood Warning	EWX	Edwards	3 hr
Apr 5, 11:19 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	56 min
Apr 6, 12:14 AM CDT	Severe Thunderstorm Warning	EWX	Kerr	31 min
Apr 6, 12:35 AM CDT	Severe Thunderstorm Warning	EWX	Kerr	10 min
Apr 6, 1:12 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kerr	63 min
Apr 6, 1:38 AM CDT	Flash Flood Warning	EWX	Edwards, Kerr, Kinney, Real, Val Verde	4 hr
Apr 6, 2:16 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie	59 min
Apr 6, 2:35 AM CDT	Flash Flood Warning	EWX	Maverick	3 hr
Apr 6, 2:48 AM CDT	Severe Thunderstorm Warning	EWX	Blanco	57 min
Apr 6, 3:04 AM CDT	Flash Flood Warning	EWX	Uvalde	3 hr
Apr 6, 3:26 AM CDT	Severe Thunderstorm Warning	EWX	Hays, Travis	64 min
Apr 6, 3:53 AM CDT	Flash Flood Warning	EWX	Gillespie	3 hr
Apr 6, 5:05 AM CDT	Flash Flood Warning	EWX	Bandera	3 hr
Apr 6, 5:41 AM CDT	Flash Flood Warning	EWX	Kerr, Real	2 hr
Apr 6, 6:14 AM CDT	Flash Flood Warning	EWX	Blanco, Kendall, Travis, Williamson	3 hr
Apr 6, 6:59 AM CDT	Flash Flood Warning	EWX	Burnet	2 hr
Apr 6, 8:04 AM CDT	Flash Flood Warning	EWX	Kerr	116 min
Apr 6, 9:27 AM CDT	Flash Flood Warning	EWX	Travis, Williamson	108 min
Apr 6, 9:30 AM CDT	Flash Flood Warning	EWX	Kendall	105 min
Apr 6, 11:10 AM CDT	Flash Flood Warning	EWX	Travis, Williamson	110 min

Nearby

Severe Thunderstorm Warnings in Texas, 2004 Every severe thunderstorm warning in 2004

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.