Alert archive / Texas / Tornado Warnings in 2001

Tornado Warning 19, NWS Austin/San Antonio, TX

May 20, 2001Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 20, 2001, 8:45 PM CDT for Travis County, Williamson County, Texas. It was in force for 60 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 20, 2001, 8:45 PM CDT (01:45 UTC)
Expired: May 20, 2001, 9:45 PM CDT
In force: 60 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties

Counties Travis County, TX, Williamson County, TX

What was reported inside it

Time	Report	Where
May 20, 9:30 PM CDT	Thunderstorm Wind 57 M	Austin, TX
May 20, 9:32 PM CDT	Thunderstorm Wind 53 M	Round Rock, TX
May 20, 9:36 PM CDT	Thunderstorm Wind 63 M	Pflugerville, 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, 1.8 hours before the alert went out and 263 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1060 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 2345 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KEWX 210149
TORSAT
TXC453-491-210245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
845 PM CDT SUN MAY 20 2001

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

* TORNADO WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  TRAVIS
  WILLIAMSON

* UNTIL 945 PM CDT

* AT 845 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH STRONG SIGNS THAT A TORNADO IS DEVELOPING 15
  MILES WEST OF LEANDER...OR ABOUT 9 MILES EAST OF MARBLE FALLS...   
  MOVING TOWARD THE EAST AT 20 MPH.

* THE TORNADO PRODUCING STORM IS EXPECTED TO BE...
  IN THE LAKE TRAVIS-LAGO VISTA-CEDAR PARK-LIBERTY HILL AREA AROUND  
  9 PM CDT
  IN THE AUSTIN-LEANDER-ROUND-ROCK-GEORGETOWN AREA BETWEEN 915 PM    
  AND 930 PM CDT
  IN THE TAYLOR AREA AROUND 945 PM CDT

* THIS WARNING INCLUDES LOCATIONS IN AND AROUND...
  AUSTIN-ROUND ROCK-GEORGETOWN AND SURROUNDING COMM.UNITIES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:09 PM CDT	Severe Thunderstorm Warning	EWX	Llano	66 min
May 20, 7:10 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell	65 min
May 20, 7:28 PM CDT	Severe Thunderstorm Warning	EWX	Karnes, Wilson	62 min
May 20, 7:51 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	69 min
May 20, 8:29 PM CDT	Tornado Warning	EWX	Burnet	31 min
May 20, 9:47 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Travis, Williamson	43 min
May 21, 6:39 AM CDT	Flash Flood Warning	EWX	Guadalupe	2 hr

Nearby

Tornado Warnings in Texas, 2001 Every tornado warning in 2001 Tornadoes 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.