Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 69, NWS Austin/San Antonio, TX

April 26, 1999Atascosa County, Bexar County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 26, 1999, 6:07 AM CDT for Atascosa County, Bexar County, Texas. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 26, 1999, 6:07 AM CDT (11:07 UTC)
Expired
Apr 26, 1999, 7:10 AM CDT
In force
63 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Atascosa County, TX, Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 76 km from the middle of the area, began a volume at 11:09 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.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 11.1 hours before the alert went out and 198 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 00:00Z on 1999-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2658 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 00:00Z on 1999-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
2658 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
1.2
Supercell composite
5.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 261107 RRA
SVRSAT
TXC013-029-261210-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
607 AM CDT MON APR 26 1999

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

* SEVERE THUNDERSTORM WARNING FOR...
  BEXAR COUNTY IN TEXAS
  ATASCOSA COUNTY IN TEXAS

* UNTIL 710 AM CDT

* AT 605 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR NATALIA... MOVING NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LYTLE AT 610 AM CDT
  VON ORMY AT 615 AM CDT
  STINSON FIELD AT 630 AM CDT

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

PASHOS

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, Apr 26, 5:47 AM CDT, 20 minutes before
TXZ171>173-183>194-202>209-217>225-228-262201-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
547 AM CDT MON APR 26 1999

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS MORNING.  A LINE
OF STRONG TO SEVERE THUNDERSTORMS HAS DEVELOPED ALONG AND JUST AHEAD
OF A COLD FRONTAL BOUNDARY.  THE STORMS ARE CAPABLE OF PRODUCING
LARGE HAIL...WIND GUSTS IN EXCESS OF 50 MPH AND DEADLY LIGHTNING.
THE STORMS ARE MOVING ACROSS THE HILL COUNTRY TO THE EAST AT 40 MPH.
AT THIS SPEED THE STORMS WILL EXIT THE HILL COUNTRY AND AFFECT
THE INTERSTATE 35 CORRIDOR AROUND RUSH HOUR...THEN MOVE
ACROSS NORTHERN SECTIONS OF SOUTH CENTRAL TEXAS BEFORE NOON.

RAINFALL AMOUNTS FROM THE STORMS WILL AVERAGE 1/2 TO 1 INCH
WITH HIGHER TOTALS OF 3 INCHES POSSIBLE MAINLY EAST OF THE
INTERSTATE 35 CORRIDOR.

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, Apr 26, 5:47 AM CDT, 20 minutes before
TXZ171>173-183>194-202>209-217>225-228-262201-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
547 AM CDT MON APR 26 1999

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS MORNING.  A LINE
OF STRONG TO SEVERE THUNDERSTORMS HAS DEVELOPED ALONG AND JUST AHEAD
OF A COLD FRONTAL BOUNDARY.  THE STORMS ARE CAPABLE OF PRODUCING
LARGE HAIL...WIND GUSTS IN EXCESS OF 50 MPH AND DEADLY LIGHTNING.
THE STORMS ARE MOVING ACROSS THE HILL COUNTRY TO THE EAST AT 40 MPH.
AT THIS SPEED THE STORMS WILL EXIT THE HILL COUNTRY AND AFFECT
THE INTERSTATE 35 CORRIDOR AROUND RUSH HOUR...THEN MOVE
ACROSS NORTHERN SECTIONS OF SOUTH CENTRAL TEXAS BEFORE NOON.

RAINFALL AMOUNTS FROM THE STORMS WILL AVERAGE 1/2 TO 1 INCH
WITH HIGHER TOTALS OF 3 INCHES POSSIBLE MAINLY EAST OF THE
INTERSTATE 35 CORRIDOR.

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
Apr 26, 12:39 AM CDTSevere Thunderstorm WarningEWXMaverick51 min
Apr 26, 5:49 AM CDTSevere Thunderstorm WarningEWXMedina61 min
Apr 26, 7:56 AM CDTSevere Thunderstorm WarningEWXBandera34 min
Apr 26, 10:54 AM CDTSevere Thunderstorm WarningEWXKarnes56 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.