Alert archive / Texas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 114, NWS Austin/San Antonio, TX

May 1, 2000Gillespie County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 1, 2000, 6:41 PM CDT for Gillespie County, Texas. It was in force for 34 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 1, 2000, 6:41 PM CDT (23:41 UTC)
Expired: May 1, 2000, 7:15 PM CDT
In force: 34 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 106 km from the middle of the area, began a volume at 23:41 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 nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.7 hours before the alert went out and 232 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 911 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 012341
SVRSAT
TXC171-020015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
641 PM CDT MON MAY 1 2000

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

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

* UNTIL 715 PM CDT

* AT 640 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES WEST OF WILLOW CITY...OR ABOUT 12 MILES
  NORTHEAST OF FREDERICKSBURG...MOVING EAST AT 40 MPH.

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 SHEeLTER.


LAT...LON 3050 9887 3029 9885 3029 9860 3050 9861

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 1, 2:00 PM CDT, 4 hours 41 minutes earlier.

Area forecast discussion, May 1, 2:00 PM CDT, 4 hours 41 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
200 PM CDT MON MAY 1 2000

SATELLITE PIC HAS AMPLY MID AND HIGH CLOUDS AND MOISTURE CONTINUING
FROM THE WEST OVER THE CWA. RAIN AND CONVECTIVE ACTIVITY OCCURRING
WITH THE MCS LAST NIGHT AND THIS MORNING HAVE MOVED NORTHEAST.
HIGH PRESSURE RIDGE OVER COLORADO IS SLIDING SOUTHEAST...LOW PRESSURE
OVER EASTERN OKLAHOMA/ARKANSAS MOVING NORTHEAST...FRONT OVER HILL
COUNTY BEGINNING TO SLOWLY SLID EASTWARD THROUGH REMAINING CWA. ALL
THIS LEADS ME TO BELIEVE THAT CONVECTIVE ACTIVITY WILL CONTINUE OVER
THE CWA THROUGH TONIGHT AND INTO TUESDAY AS A OVER-RUNNING CONDITIONS
PREVAILS...HOWEVER BRIEF AND ISOLATED IT MAY BE.

FRONT NOT MOVING FAST ENOUGH TO CLEAR THE CWA BEFORE TONIGHT AS GULF
HIGH DEW-POINTS VALUES INFLOW CONTINUES TO SLIDE NORTH UP OVER HILL
COUNTRY COUNTIES AND PORTIONS OF SOUTH CENTRAL SECTIONS. ISOLATED
CONVECTIVE ACTIVITY CONTINUES TO FIRER ALONG BOUNDARIES CREATED FROM
THE EARLIER ACTIVITY.

EXPECT CONVECTIVE ACTIVITY TO INCREASE TONIGHT. SURFACE DEW-POINT
DRIER IN THE WESTERN COUNTIES BUT STILL REMAIN IN THE 60S OVER THE
EASTERN SECTIONS.

WILL KEEP ISOLATED BRIEF LOCALLY HEAVY RAIN AND SEVERE WEATHER THREAT
FOR TONIGHT'S FORECAST. AS SPC STILL HAS SEVERE MENTION FOR ENTIRE
CWA MONDAY NIGHT.

EXTENDED FORECAST...WEDNESDAY THROUGH FRIDAY STILL HAS CWA UNDER
MOSTLY CLOUDY SKIES...20 TO 30 PERCENT POPS.

PRELIMINARY NUMBERS...

DRT 62/81/62/85 3222
AUS 61/74/61/80 4332
SAT 60/76/62/82 4322

.EWX...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 9:24 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	51 min
Apr 30, 9:58 PM CDT	Severe Thunderstorm Warning	EWX	Bandera	62 min
Apr 30, 10:11 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina, Uvalde, Zavala	64 min
Apr 30, 11:38 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	62 min
May 1, 12:30 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	60 min
May 1, 1:40 AM CDT	Flash Flood Warning	EWX	Edwards, Kerr, Real	110 min
May 1, 4:29 AM CDT	Severe Thunderstorm Warning	EWX	Bexar, Guadalupe	61 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.