Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 61, NWS Austin/San Antonio, TX

May 6, 2001Llano County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 6, 2001, 5:39 PM CDT for Llano County, Texas. It was in force for 51 min. No storm report in the archive falls 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.

The facts

Issued: May 6, 2001, 5:39 PM CDT (22:39 UTC)
Expired: May 6, 2001, 6:30 PM CDT
In force: 51 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Llano County, TX

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 6, 2:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.7 hours before the alert went out and 260 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: 1500 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 475 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 309 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

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

199 
WUUS54 KEWX 062241
SVRSAT
TXC299-062330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
539 PM CDT SUN MAY 6 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 630 PM CDT

* AT 539 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 15 MILES WEST OF TOW...OR ABOUT 9 MILES NORTH
  OF LLANO...MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER TOW AT 610 PM
  7 MILES NORTH OF BUCHANAN DAM AT 615 PM

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. 


LAT...LON 3090 9894 3075 9895 3077 9843 3092 9844

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 May 6, 3:15 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, May 6, 3:15 PM CDT, 2 hours 24 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
315 PM CDT SUN MAY 6 2001

ISOLD TRW POPPING WEST OF THE RIVER OVR THE MOUNTAIN OF MEX AND
NORTH OF THE HILL COUNTRY NEAR THE DRY LINE.  CAPES ACRS THE CWA
ARE IN THE 2500-4000 RANGE WITH LITTLE OR NO CAP...AND WITH SFC
BASED LIS NEARING DOUBLE DIGITS.  AMS VERY UNSTABLE AND EXPECT SCT
TSTMS TO CONT FIRE NEAR THE DRY LINE/SRN END OF S/W THIS EVENING.
WILL GO WITH HIGHEST POPS ACROSS THE HILL COUNTRY INTO THE NRN
SECTIONS OF S CENTRAL TEXAS WITH MENTION OF SVR THIS EVENING AND
LOWER CHCS OVER THE SE COUNTIES WHERE A FEW MAINLY SEA BREEZE TRW
PSBL.  EXPECT LOWER POPS MONDAY IN THE WAKE OF THE S/W WITH MAINLY
WDLY SCT AFTN/EVENING RW/TRW...THEN A WK COLD FRONT SLIPS S INTO THE
CWA MON NIGHT AND EARLY TUE BEFORE QUICKLY RETREATING NEWD OUT OF
THE AREA.  WILL UP MOS POPS WITH THE CDFNT FOR MON NIGHT...BUT
POTENTIAL LOOKS BETTER FOR HVY RAIN THAN SVR DUE TO DEEPER
MOISTURE...WK UPR AIR DYNAMICS...AND FRONTAL BOUNDARY.

PRELIMINARY NUMBERS...
AUS 069/083/066/081 4353
DRT 068/090/068/087 3232
SAT 071/085/067/083 3243

.EWX...NONE.

1/13

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 8:20 PM CDT	Tornado Warning	EWX	Maverick	60 min
May 5, 9:18 PM CDT	Tornado Warning	EWX	Dimmit, Maverick	57 min
May 5, 10:12 PM CDT	Tornado Warning	EWX	Dimmit	48 min
May 5, 11:10 PM CDT	Severe Thunderstorm Warning	EWX	Maverick	50 min
May 5, 11:53 PM CDT	Tornado Warning	EWX	Dimmit	52 min
May 6, 5:05 PM CDT	Severe Thunderstorm Warning	EWX	Llano	30 min
May 6, 5:48 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Frio	57 min
May 6, 6:00 PM CDT	Tornado Warning	EWX	Llano	45 min
May 6, 6:40 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	65 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Every 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; the sounding from the Mesonet's radiosonde archive.