Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 20, NWS Austin/San Antonio, TX

May 11, 1999Gillespie County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 11, 1999, 7:28 PM CDT for Gillespie County, Texas. It was in force for 62 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 11, 1999, 7:28 PM CDT (00:28 UTC)
Expired
May 11, 1999, 8:30 PM CDT
In force
62 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 112 km from the middle of the area, began a volume at 00:30 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

TimeReportWhereRemark
May 11, 8:00 PM CDTThunderstorm WindHarper, TX
May 11, 8:10 PM CDTHail 2.5Harper, TX
May 11, 8:20 PM CDTTornado F3Harper, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

IssuedProductOfficeLasted
May 11, 3:30 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 0.5 hours before the alert went out and 211 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 00:00Z on 1999-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3001 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 00:00Z on 1999-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.193958Sfc1 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
3001 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
1924 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.1
Supercell composite
5.5

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KSAT 120027 RRA
TORSAT
TXC171-120130-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
728 PM CDT TUE MAY 11 1999

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  GILLESPIE COUNTY IN TEXAS

* UNTIL 830 PM CDT

THIS REPLACES THE SEVERE THUNDERSTORM WARNING ISSUED AT 722 PM.


* AT 724 PM CDT... WAS INDICATED BY NATIONAL WEATHER SERVICE RADAR
  A TORNADIC THUNDERSTORM 25 MILES NORTHWEST OF
FREDERICKSBURG OR 6 MILES WEST OF DOSS... MOVING SOUTH AT 5 MPH.
A FUNNEL CLOUD WAS SPOTTED WITH THIS STORM BY THE GILLESPIE SHERIFF
DEPARTMENT.

ABANDON MOBILE HOMES GO IN A NEARBY STURDY BUILDING. AS A LAST
RESORT LIE FLAT IN A DITCH AND COVER YOUR HEAD.

CFM


&

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 7:03 PM CDTTornado WarningEWXLlano62 min
May 11, 7:22 PM CDTSevere Thunderstorm WarningEWXGillespie63 min
May 11, 8:14 PM CDTFlash Flood WarningEWXGillespie3 hr
May 11, 8:14 PM CDTFlash Flood WarningEWXBurnet3 hr
May 11, 8:26 PM CDTTornado WarningEWXGillespie64 min
May 11, 8:29 PM CDTTornado WarningEWXBurnet61 min
May 11, 8:34 PM CDTSevere Thunderstorm WarningEWXKerr61 min
May 11, 8:50 PM CDTSevere Thunderstorm WarningEWXWilliamson60 min
May 11, 9:16 PM CDTFlash Flood WarningEWXWilliamson3 hr
May 11, 9:35 PM CDTSevere Thunderstorm WarningEWXKerr60 min
May 11, 9:39 PM CDTSevere Thunderstorm WarningEWXReal2 hr
May 11, 9:57 PM CDTSevere Thunderstorm WarningEWXKinney, Maverick63 min
May 11, 10:03 PM CDTFlash Flood WarningEWXKerr3 hr
May 11, 10:20 PM CDTSevere Thunderstorm WarningEWXBandera70 min
May 11, 10:56 PM CDTSevere Thunderstorm WarningEWXReal34 min
May 11, 11:03 PM CDTSevere Thunderstorm WarningEWXKinney62 min
May 11, 11:14 PM CDTSevere Thunderstorm WarningEWXUvalde61 min
May 11, 11:26 PM CDTSevere Thunderstorm WarningEWXVal Verde79 min
May 11, 11:31 PM CDTSevere Thunderstorm WarningEWXMedina64 min
May 11, 11:56 PM CDTFlash Flood WarningEWXKinney, Maverick4 hr
May 12, 12:03 AM CDTSevere Thunderstorm WarningEWXKinney57 min
May 12, 12:15 AM CDTSevere Thunderstorm WarningEWXUvalde60 min
May 12, 12:31 AM CDTSevere Thunderstorm WarningEWXMedina59 min
May 12, 12:35 AM CDTFlash Flood WarningEWXMedina, Uvalde3 hr
May 12, 12:49 AM CDTSevere Thunderstorm WarningEWXZavala91 min
May 12, 1:10 AM CDTSevere Thunderstorm WarningEWXMaverick65 min
May 12, 1:20 AM CDTSevere Thunderstorm WarningEWXFrio80 min
May 12, 3:59 AM CDTSevere Thunderstorm WarningEWXKarnes61 min
May 12, 4:51 AM CDTFlash Flood WarningEWXDeWitt, Karnes2 hr

Nearby

Tornado Warnings in Texas, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.