Alert archive / Texas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 134, NWS Austin/San Antonio, TX

May 12, 2000Blanco County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 12, 2000, 8:42 PM CDT for Blanco 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 12, 2000, 8:42 PM CDT (01:42 UTC)
Expired: May 12, 2000, 9:45 PM CDT
In force: 63 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Blanco County, TX

The radar

The Austin/San Antonio radar (KEWX), 83 km from the middle of the area, began a volume at 01:43 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 12, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 1.7 hours before the alert went out and 257 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: 1539 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 3252 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

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

296 
WUUS54 KEWX 130142
SVRSAT
TXC031-130245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
842 PM CDT FRI MAY 12 2000

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

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  BLANCO COUNTY

* UNTIL 945 PM CDT

* AT 842 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 11 MILES WEST OF ROUND MOUNTAIN...MOVING
  SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ROUND MOUNTAIN AROUND 900 PM CDT
  JOHNSON CITY AROUND 905 PM CDT
  CYPRESS MILL AROUND 915 PM CDT
  PEDERNALES FALLS STATE PARK AROUND 920 PM CDT

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.

A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND DO 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 3050 9860 3016 9859 3024 9823 3044 9814

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 12, 2:45 PM CDT, 5 hours 57 minutes earlier.

Area forecast discussion, May 12, 2:45 PM CDT, 5 hours 57 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
245 PM CDT FRI MAY 12 2000

MOST OF THE MODEL RUNS HAVE BEEN FAIRLY CONSISTENT IN BRINGING THE
COLD FRONT WHICH IS IN WEST CENTRAL TEXAS SOUTHWARD ACROSS THE AREA
AND DEVELOPING PRECIPITATION WITH THE FRONT BEGINNING EITHER LATE
THIS AFTERNOON OR THIS EVENING.  WILL KEEP THAT TREND IN CURRENT
FORECAST AND POSSIBLY RAISE POPS IN SOME AREAS.  INCREASING
MIDDLE CLOUDS OVER SOUTHWEST TEXAS INDICATES SOME LIFTING OCCURRING
AS UPPER TROUGH COMES CLOSER.

STEEP LAPSE RATE ABOVE CAP SO ANY THUNDERSTORMS COULD BECOME QUITE
STRONG.  LOW-LEVEL MOISTURE IS FAIRLY LIMITED ESPECIALLY WEST BUT
MAIN TRAJECTORIES BEHIND THE FRONT LATER TONIGHT AND SATURDAY WILL
BE FROM THE EAST WHERE MOISTURE IS BETTER.  COOLER TEMPERATURES ON
TAP FOR AREA BEHIND THE COLD FRONT AIDED BY MOSTLY CLOUDY
CONDITIONS.

COOLER AIR WILL BE DEEPER BUT BEGINNING TO SLIP TO THE EAST ON
SUNDAY AS RAIN THREATS BEGIN TO DECREASE.  A WARMER AND DRIER
PATTERN WILL SET BACK IN MONDAY THROUGH WEDNESDAY AS AN UPPER RIDGE
IS REESTABLISHED OVER THE AREA.

PRELIMINARY NUMBERS
AUS 68/80/60/80 4632
SAT 71/82/63/81 35g32
DRT 72/83/65/82 2321

.EWX...NONE.

16/06/20

In the hours before

Special weather statement, May 12, 2:52 PM CDT, 5 hours 50 minutes before

TXZ171>173-183>194-202>209-217>225-228-122349-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
252 PM CDT FRI MAY 12 2000

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT FOR THE
HILL COUNTRY AND ADJACENT AREAS OF SOUTH CENTRAL TEXAS.  THIS
INCLUDES THE METROPOLITAN AREAS OF AUSTIN AND SAN ANTONIO.
LARGE HAIL AND DAMAGING WIND GUSTS WILL BE THE PRIMARY THREAT.

A DRY LINE IS MOVING SLOWLY EAST INTO THE HILL COUNTRY.  AS IT
ENCOUNTERS THE HOT AND VERY INSTABLE AIR...THUNDERSTORMS WILL
RAPIDLY DEVELOP.  A COLD FRONT MOVING SOUTHEAST TOWARD THE
HILL COUNTRY THIS EVENING AND AN UPPER LEVEL DISTURBANCE WILL
KEEP THE SHOWER AND THUNDERSTORMS PRODUCTION GOING THROUGH THE
NIGHT.  LOCALLY HEAVY RAINFALL IS POSSIBLE WHERE SHOWERS AND
THUNDERSTORMS TRAVERSE THE SAME AREA.

EMERGENCY MANAGEMENT AND STORM SPOTTER GROUPS ARE ADVISED TO MONITOR
THE LATEST WEATHER DEVELOPMENTS THROUGHOUT THE DAY.  SPOTTER
ACTIVATION MAY BE REQUIRED LATER THIS EVENING.

FOR INFORMATION ON WEATHER THREATS IN SURROUNDING AREAS...REFER TO
OUTLOOKS FROM 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.

Issued	Product	Office	Counties	Lasted
May 12, 7:13 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	62 min
May 12, 7:28 PM CDT	Severe Thunderstorm Warning	EWX	Llano	62 min
May 12, 8:03 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	57 min
May 12, 8:12 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	63 min
May 12, 8:25 PM CDT	Severe Thunderstorm Warning	EWX	Llano	35 min
May 12, 8:46 PM CDT	Severe Thunderstorm Warning	EWX	Travis, Williamson	59 min
May 12, 8:55 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	65 min
May 12, 9:08 PM CDT	Severe Thunderstorm Warning	EWX	Kerr	67 min
May 12, 10:50 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell	55 min
May 12, 10:50 PM CDT	Severe Thunderstorm Warning	EWX	Lee	55 min
May 12, 11:11 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	64 min
May 13, 12:56 AM CDT	Severe Thunderstorm Warning	EWX	Maverick	64 min
May 13, 1:56 AM CDT	Severe Thunderstorm Warning	EWX	Maverick	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 2000 Every severe thunderstorm warning in 2000

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.