Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 18, NWS Austin/San Antonio, TX

March 8, 2001Gillespie County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 8, 2001, 3:45 PM CST for Gillespie County, Texas. It was in force for 45 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: Mar 8, 2001, 3:45 PM CST (21:45 UTC)
Expired: Mar 8, 2001, 4:30 PM CST
In force: 45 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), 117 km from the middle of the area, began a volume at 21:47 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
Mar 8, 3:00 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 9.8 hours before the alert went out and 202 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: 43 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 082144
SVRSAT
TXC171-082230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
345 PM CST THU MAR 8 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 430 PM CST

* AT 343 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 20 MILES WEST OF FREDERICKSBURG...OR ABOUT 20
  MILES NORTH OF KERRVILLE...MOVING EAST AT 20 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 SHELTER.


LAT...LON 3035 9933 3018 9921 3017 9866 3044 9864

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 Mar 8, 3:41 PM CST, 4 minutes earlier.

Area forecast discussion, Mar 8, 3:41 PM CST, 4 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
341 PM CST THU MAR 8 2001

UPPER LOW MOVING ACROSS CENTRAL TEXAS AT LATE AFTERNOON.  MODELS
FAIRLY CONSISTENT IN CONTINUED EASTWARD MOVEMENT OUT OF TEXAS BY
MORNING.  HOWEVER...FOR THIS EVENING...DRYLINE PROGRESSING EAST AND
COLD FRONT PROGRESSING SOUTH THROUGH CWA BY OVERNIGHT.  SEVERE STORMS
STILL POSSIBLE EASTERN CWA AHEAD OF DRYLINE AND NEAR UPPER LOW AS
THERMODYNAMIC/DYNAMIC PROFILES FAVORABLE.  LITTLE OR POPS WEST AND
CENTRAL AS SOMEWHAT DRIER AND SUBSIDENT AIRMASS IN WAKE OF LOW.
RATHER MOIST AIRMASS PERSIST AFTER SYSTEM...SO SKIES WILL REMAIN
MOSTLY CLOUDY.  ETA TEMPERATURES SEEM OKAY AND WILL FOLLOW.  NEXT
SYSTEM SLATED FOR SUNDAY AND MONDAY...SO WILL MAINTAIN CHANCE POPS
WITH SLIGHT BEGINNING SATURDAY NIGHT.  04.

PRELIMS...
AUS 48/64 48/65 6000
SAT 48/64 49/68 3000
DRT 45/68 50/72 0000

.EWX...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 8, 4:02 PM CST	Severe Thunderstorm Warning	EWX	Bexar, Guadalupe	43 min
Mar 8, 4:21 PM CST	Severe Thunderstorm Warning	EWX	Kendall, Kerr	54 min
Mar 8, 4:39 PM CST	Tornado Warning	EWX	Kendall	66 min
Mar 8, 4:50 PM CST	Severe Thunderstorm Warning	EWX	Wilson	40 min
Mar 8, 5:33 PM CST	Tornado Warning	EWX	Comal	42 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; radar from the NEXRAD Level II archive.