Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 73, NWS Austin/San Antonio, TX

May 2, 1999Lavaca County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 2, 1999, 4:46 PM CDT for Lavaca County, Texas. It was in force for 59 min. 1 report 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 2, 1999, 4:46 PM CDT (21:46 UTC)
Expired
May 2, 1999, 5:45 PM CDT
In force
59 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Lavaca County, TX

The radar

The Austin/San Antonio radar (KEWX), 112 km from the middle of the area, began a volume at 21:48 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 2, 5:00 PM CDTHail 0.75Yoakum, 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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 9.8 hours before the alert went out and 188 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, Corpus Christi, TX at 12:00Z on 1999-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 566 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, Corpus Christi, TX at 12:00Z on 1999-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.19395878Sfc1 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
566 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
613 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
164 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 022146 RRA
SVRSAT
TXC285-022245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
446 PM CDT SUN MAY 2 1999

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

* SEVERE THUNDERSTORM WARNING FOR...
  LAVACA COUNTY IN TEXAS

* UNTIL 545 PM CDT

* AT 445 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES SOUTHWEST OF YOAKUM... MOVING
  NORTHEAST AT d30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  YOAKUM AT 555 PM CDT
  SHINER AT 600 PM CDT

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

MO

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.

In the hours before

Special weather statement, May 2, 11:10 AM CDT, 5 hours 36 minutes before
TXZ171>173-183>194-202>209-217>225-228-022300-

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1110 AM CDT SUN MAY 2 1999

AN UPPER LEVEL DISTURBANCE COMBINED WITH ABUNDANT LOW LEVEL MOISTURE
WILL PRODUCE A THREAT OF STRONG THUNDERSTORMS ACROSS THE TEXAS HILL
COUNTRY AND SOUTH CENTRAL TEXAS THIS AFTERNOON AND THIS EVENING. ALTHOUGH
INSTABILITY AND VERTICAL WIND SHEAR WILL BE SUFFICIENT FOR THE
DEVELOPMENT OF SEVERE THUNDERSTORMS, THE LACK OF ENOUGH DAYTIME HEATING
WILL LIKELY PREVENT THESE THUNDERSTORMS FROM REACHING SEVERE LEVELS.
A FEW STRONG STORMS COULD PRODUCE VERY HEAVY RAINFALL, SMALL HAIL
AND WIND GUSTS UP TO 50 MPH.

RAINFALL TOTALS FROM SCATTERED SHOWERS AND THUNDERSTORMS THIS
AFTERNOON AND THIS EVENING WILL AVERAGE ONE QUARTER TO ONE HALF INCH
WITH ISOLATED ONE INCH AMOUNTS POSSIBLE.  NO OTHER HAZARDOUS WEATHER
CONDITIONS ARE EXPECTED ACROSS THE HILL COUNTRY OR SOUTH CENTRAL
TEXAS THROUGH TONIGHT.

THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF
THE ZONE FORECASTS...SHORT TERM FORECAST...WATCHES...WARNINGS AND
ADVISORIES.  THE HAZARDOUS WEATHER OUTLOOK ITSELF WILL BE UPDATED
ONLY IF UNEXPECTED HAZARDOUS WEATHER DEVELOPS OR IF EXPECTED
HAZARDOUS WEATHER NO LONGER IS FORECAST TO DEVELOP.

FOR INFORMATION ON WEATHER THREATS IN AREAS SURROUNDING SOUTH CENTRAL
TEXAS...PLEASE REFER TO THE HAZARDOUS WEATHER OUTLOOKS FROM NWS
OFFICES IN MIDLAND...SAN ANGELO...FORT WORTH...HOUSTON/GALVESTON
AND CORPUS CHRISTI.
Special weather statement, May 2, 4:45 PM CDT, 1 minute before
TXZ171>173-183>194-202>209-217>225-228-031200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
445 PM CDT SUN MAY 2 1999

WIDELY SCATTERED SHOWERS OR THUNDERSTORMS WILL CONTINUE THROUGH
THE EVENING HOURS AND REDEVELOP AGAIN DURING THE DAY MONDAY.
RAINFALL AMOUNTS WILL AVERAGE BETWEEN A QUARTER OF AN INCH AND
HALF AN INCH WITH HIGHER TOTALS IN EXCESS OF AN INCH POSSIBLE
IN THE HEAVIER STORMS.  OTHERWISE...NO HAZARDOUS WEATHER IS
EXPECTED TONIGHT OR MONDAY ACROSS SOUTH CENTRAL TEXAS AND THE
TEXAS HILL COUNTRY.

THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF
THE ZONE FORECASTS...SHORT TERM FORECAST...WATCHES...WARNINGS AND
ADVISORIES.  THE HAZARDOUS WEATHER OUTLOOK ITSELF WILL BE UPDATED
ONLY IF UNEXPECTED HAZARDOUS WEATHER DEVELOPS OR IF EXPECTED
HAZARDOUS WEATHER NO LONGER IS FORECAST TO DEVELOP.

FOR INFORMATION ON WEATHER THREATS IN AREAS SURROUNDING SOUTH CENTRAL
TEXAS...PLEASE REFER TO THE HAZARDOUS WEATHER OUTLOOKS FROM NWS
OFFICES IN MIDLAND...SAN ANGELO...FORT WORTH...HOUSTON/GALVESTON
AND CORPUS CHRISTI.

The office that day

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

IssuedProductOfficeCountiesLasted
May 2, 4:27 PM CDTSevere Thunderstorm WarningEWXDeWitt63 min

Nearby

Severe Thunderstorm Warnings in Texas, 1999Every severe thunderstorm warning 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.