Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 203, NWS Austin/San Antonio, TX

May 7, 2006Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 7, 2006, 8:50 PM CDT for Val Verde County, Texas. It was in force for 85 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 7, 2006, 8:50 PM CDT (01:50 UTC)
Expired: May 7, 2006, 10:15 PM CDT
In force: 85 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 109 km from the middle of the area, began a volume at 01:54 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 7, 4:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 1.8 hours before the alert went out and 66 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: 2122 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1339 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.8

Open this sounding in Storm Lab

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 7, 6:37 PM CDT, 2 hours 13 minutes earlier.

Area forecast discussion, May 7, 6:37 PM CDT, 2 hours 13 minutes before

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Hazardous weather outlook, May 7, 5:03 PM CDT, 3 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
503 PM CDT SUN MAY 7 2006

TXZ171>173-183>194-202>209-217>225-228-082215-
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA-
FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT-
503 PM CDT SUN MAY 7 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TONIGHT
CONDITIONS HAVE BECOME UNSTABLE OVER THE RIO GRANDE REGION AND
SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE
EVENING HOURS AND MOVE EAST. THE MAIN THREATS FROM THE
THUNDERSTORMS WILL BE LARGE HAIL AND DAMAGING WINDS...BUT HEAVY
RAINFALL...CAUSING LOCALIZED FLOODING WILL ALSO BE LIKELY WITH
THE STORMS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
THERE WILL BE ANOTHER CHANCE FOR SHOWERS AND THUNDERSTORMS LATE
MONDAY NIGHT THROUGH TUESDAY AND EVEN INTO TUESDAY EVENING ACROSS
SOUTH CENTRAL TEXAS...AS ANOTHER STRONG UPPER LEVEL SYSTEM MOVES
ACROSS THE AREA FROM THE WEST. SOME OF THE THUNDERSTORMS MAY BE
SEVERE...WITH LARGE HAIL AND DAMAGING WINDS. THE STORMS WILL ALSO
PRODUCE VERY HEAVY RAINFALL THAT WILL LIKELY CAUSE FLOODING.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED THIS EVENING AND AGAIN ON TUESDAY.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 11:46 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	59 min
May 8, 12:19 AM CDT	Severe Thunderstorm Warning	EWX	Burnet	56 min
May 8, 12:38 AM CDT	Severe Thunderstorm Warning	EWX	Kerr	67 min
May 8, 12:45 AM CDT	Severe Thunderstorm Warning	EWX	Williamson	60 min
May 8, 12:54 AM CDT	Flash Flood Warning	EWX	Travis, Williamson	3 hr
May 8, 1:02 AM CDT	Severe Thunderstorm Warning	EWX	Travis	58 min
May 8, 1:11 AM CDT	Flash Flood Warning	EWX	Gillespie, Kerr	3 hr
May 8, 1:23 AM CDT	Flash Flood Warning	EWX	Blanco	3 hr
May 8, 1:42 AM CDT	Severe Thunderstorm Warning	EWX	Lee	63 min
May 8, 1:44 AM CDT	Severe Thunderstorm Warning	EWX	Williamson	24 min
May 8, 1:48 AM CDT	Severe Thunderstorm Warning	EWX	Kendall	57 min
May 8, 2:42 AM CDT	Severe Thunderstorm Warning	EWX	Comal	20 min
May 8, 5:56 PM CDT	Severe Thunderstorm Warning	EWX	Maverick	60 min

Nearby

Severe Thunderstorm Warnings in Texas, 2006 Every severe thunderstorm warning in 2006

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.