Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 172, NWS Austin/San Antonio, TX

November 28, 2001Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Nov 28, 2001, 3:05 AM CST for Travis County, Williamson County, Texas. It was in force for 55 min. 2 reports 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, 3:05 AM CST (09:05 UTC)
Expired
Nov 28, 2001, 4:00 AM CST
In force
55 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Travis County, TX, Williamson County, TX

What was reported inside it

TimeReportWhereRemark
Nov 28, 3:30 AM CSTHail 0.75Pflugerville, TX
Nov 28, 3:45 AM CSTHail 0.75Hutto, 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

Fort Worth, TX (KFWD), launched 00:00Z, 9.1 hours before the alert went out and 262 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, Fort Worth, 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, Fort Worth, TX at 00:00Z on 2001-11-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.1939587897117Sfc1 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
1014 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
623 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.

505 
WUUS54 KEWX 280903
SVRSAT
TXC453-491-281000-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 400 AM CST

* AT 305 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A   
SEVERE THUNDERSTORM 10 MILES SOUTH OF OAK HILL MOVING NORTH AT 30 
MPH.  LARGE HAIL IS POSSIBLE WITH THIS STORM.  

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.


LAT...LON 3036 9812 3007 9771 3060 9726 3083 9762
          3084 9784

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, 5 hours 57 minutes earlier.

Area forecast discussion, Nov 27, 9:08 PM CST, 5 hours 57 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, 1:30 AM CSTSevere Thunderstorm WarningEWXBexar60 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.