Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 171, NWS Austin/San Antonio, TX

November 28, 2001Bexar County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Nov 28, 2001, 1:30 AM CST for Bexar County, Texas. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued
Nov 28, 2001, 1:30 AM CST (07:30 UTC)
Expired
Nov 28, 2001, 2:30 AM CST
In force
60 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 58 km from the middle of the area, began a volume at 07:30 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
Nov 28, 2:10 AM CSTHail 1San Antonio, 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

Del Rio, TX (KDRT), launched 00:00Z, 7.5 hours before the alert went out and 221 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 2001-11-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2001-11-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1909 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
265 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.

342 
WUUS54 KEWX 280731
SVRSAT
TXC029-280830-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
130 AM CST WED NOV 28 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 230 AM CST

* AT 130 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A   
SEVERE THUNDERSTORM 8 MILES SOUTHWEST OF ELMENDORF....MOVING NORTH 
AT 25 MPH.  THE STORM SHOULD MOVE OVER ELMENDORF ABOUT 145 AM AND 
SKIRT THE EASTERN SECTIONS OF SAN ANTONIO ABOUT 155 AM TO 215 AM.   

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.


LAT...LON 2927 9878 2914 9842 2946 9816 2967 9845
          2972 9858 2969 9878

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 Nov 27, 9:08 PM CST, 4 hours 22 minutes earlier.

Area forecast discussion, Nov 27, 9:08 PM CST, 4 hours 22 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
908 PM CST TUE NOV 27 2001

RADAR SHOWS NUMEROUS RAIN SHOWERS ACROSS THE EAST WITH SOME SNOW
DEVELOPING FAR WEST AHEAD OF NEXT SHORT-WAVE ROTATING AROUND UPPER
LOW.  SURFACE ANALYSIS SHOWS TEMPERATURES A LITTLE BELOW MODELS
INDICATE AT THIS HOUR IN SPOTS THROUGH THE CWA.  SO...WILL LOWER
FORECAST LOWS IN A FEW AREAS AND WITH A FEW HOURS OF SUB-FREEZING
TEMPERATURES EXPECTED AND NONE REPORTED YET IN THE NORTH...WILL
ISSUE FREEZE WARNING THERE.  THIS WILL CREATE A NEED TO FINE TUNE
PRECIPITATION TYPES AS WELL.  STILL THINK ONLY LIGHT ACCUMULATIONS
OVERNIGHT AND ADVISORY SHOULD SUFFICE.  OTHERWISE...ONLY SOME MINOR
ADJUSTMENTS FOR TONIGHT.

WEDNESDAY INTO WEDNESDAY NIGHT...FORECAST GETS REAL INTERESTING AND
APPEARS WINTER STORM WARNING WILL LIKELY BE REQUIRED.  UPPER LOW
CONTINUES TO DIG AS UPPER JET STILL ON BACK SIDE.  00Z ETA SHOWS
TRACK LOW DIRECTLY ACROSS THE CWA...GENERALLY FROM EAGLE PASS TO SAN
ANTONIO TO LA GRANGE.  THIS WOULD CREATE BETTER CHANCES FOR
ACCUMULATIONS...ESPECIALLY IN THE NORTH.  FOR NOW...WILL NOT UPGRADE
AS STILL SOME UNCERTAINTY.  OTHERWISE...ONLY SOME MINOR ADJUSTMENTS.

04/06.

.EWX...WINTER WEATHER ADVISORY...TONIGHT...HILL COUNTRY TO ADJACENT
        PARTS OF CENTRAL TEXAS
       WINTER STORM WATCH...WEDNESDAY AND WEDNESDAY NIGHT...HILL
        COUNTY AND ADJACENT AREAS OF SOUTH CENTRAL TEXAS.
       FREEZE WARNING...TONIGHT...HILL COUNTRY TO ADJACENT PARTS OF
        CENTRAL TEXAS

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 28, 3:05 AM CSTSevere Thunderstorm WarningEWXTravis, Williamson55 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm warning in 2001

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.