Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 99, NWS Austin/San Antonio, TX

May 27, 2001Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 27, 2001, 12:20 AM CDT for Val Verde County, Texas. It was in force for 55 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 27, 2001, 12:20 AM CDT (05:20 UTC)
Expired: May 27, 2001, 1:15 AM CDT
In force: 55 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Val Verde County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 5.3 hours before the alert went out and 85 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: 1759 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 2530 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

012 
WUUS54 KEWX 270525
SVRSAT
TXC465-270515-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1220 AM CDT SUN MAY 27 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  VAL VERDE

* UNTIL 115 AM CDT

* AT 1220 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 30 MILES NORTH OF JUNO...OR ABOUT 9 MILES SOUTH
  OF OZONA...MOVING SOUTHEAST AT 30 MPH.  THE STORM SHOULD REACH    
JUNO ABOUT 1240 AM. 

DAMAGING WINDS AND VERY LARGE HAIL ARE 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 2999 10166 2935 10081 3025 10079 3026 10120
          3025 10170

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 26, 9:05 PM CDT, 3 hours 15 minutes earlier.

Area forecast discussion, May 26, 9:05 PM CDT, 3 hours 15 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION ...UPDATE
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
905 PM CDT SAT MAY 26 2001

ABOUT TO UPDATE FORECAST FOR SEVERE THUNDERSTORM WATCH OVER MOST OF
THE HILL COUNTRY.

06/02/JB
----------------------------

00Z U/A PLOTS INDICATE COOLING AT 500 MB APPROACHING HILL COUNTRY
AND FAR WEST COUNTIES.  ISOLD STORMS OVER CROCKETT COUNTY HAS
DISSIPATED AS THEY MOVE AWAY FROM BEST SURFACE LIFT.  COMBINATION
OF THINGS WILL COME INTO PLAY FOR ADDING/INCREASING CHANCES OF TSTMS
TONIGHT.  THE SEABREEZE BOUNDARY IS MOVING WEST AT 10 MPH AND WILL
REACH THE RIO GRANDE AROUND 04Z TONIGHT.  CURRENT TORNADO WATCH OVER
BIG COUNTRY EXPIRES AT 03Z.  UPPER FLOW PUSHING STORMS SOUTHEAST AND
THETA-E RIDGE NOSING NORTH THROUGH THE RIO GRANDE INTO BIG COUNTRY,
WILL LAY A PATH FOR THUNDERSTORMS TO CONTINUE MOVING SOUTH INTO THE
HILL COUNTRY.  WILL INCREASE POPS TONIGHT FOR APPROACHING TSTMS.
OTHERWISE NO CHANGE TO ONGOING FORECAST.
06/02/JB

......PREVIOUS DISCUSSION.............
ANOTHER LOW SHEAR/HIGH CAPE SEVERE WEATHER OUTBREAK SLIDES EAST INTO
THE COASTAL PLAINS WHILE UPPER RIDGING IS BEGINNING TO TAKE HOLD
OVER SOUTH CENTRAL TEXAS. A SIGNIFICANT SHORTWAVE WILL RIDE OVER THE
TOP OF THE CENTRAL US RIDGE THIS AFTERNOON. CURRENT THINKING IS IN
LINE WITH ETA/AVN THAT THE CONTINUED FEED OF ENERGY FROM THE WEST
WILL STRENGTHEN THIS RIDGE WITH BOTH THE CENTRAL US RIDGE AND UPPER
LOW OVER THE GREAT LAKES AREA SHIFTING SLOWLY EAST. ONLY AREA IN A
THREAT FOR THUNDERSTORMS TONIGHT WOULD BE THE NORTH WHERE ISOLATED
ACTIVITY MAY BE GENERATED OVER WEST CENTRAL TEXAS. WILL KEEP POPS
OUT FOR TONIGHT/SUNDAY FOR ALL EXCEPT AN ISOLATED POP FOR
NORTH/NORTHEAST COUNTIES. GUIDANCE TEMPS LOOK FAIRLY UNIFORM SO WILL
NOT STRAY FAR. SOME OF THE WARMEST TEMPS OF THE SEASON SHOULD BE
REACHED DURING THE NEXT FEW DAYS.

NEXT CHANCE OF RAIN COMES LATE IN THE WEEK, WHEN THE RIDGE GIVES WAY
TO AN UPPER LOW AND A POSSIBLE COLD FRONT. CONFIDENCE IS LOW WITH
THESE FEATURES, SO WILL KEEP CHANCES SLIGHT.

PRELIMINARY NUMBERS...
AUS 070/092/072/094 11-0
SAT 073/092/074/096 --00
DRT 074/102/075/102 --00

.EWX...NONE.

18/10/23

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.