Alert archive / Texas / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 62, NWS Austin/San Antonio, TX

May 16, 2010Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 16, 2010, 3:28 AM CDT for Val Verde County, Texas. It was in force for 47 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 16, 2010, 3:28 AM CDT (08:28 UTC)
Expired: May 16, 2010, 4:15 AM CDT
In force: 47 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 109 km from the middle of the area, began a volume at 08:31 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 00:00Z, 8.5 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: 2147 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1242 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.7

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 16, 12:02 AM CDT, 3 hours 26 minutes earlier.

Area forecast discussion, May 16, 12:02 AM CDT, 3 hours 26 minutes before

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Hazardous weather outlook, May 15, 9:11 PM CDT, 6 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
911 PM CDT SAT MAY 15 2010

TXZ171>173-183>194-202>209-217>225-228-170215-
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-
911 PM CDT SAT MAY 15 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

AN UPPER LEVEL DISTURBANCE WILL HELP TO PRODUCE THUNDERSTORMS
LATER TONIGHT MAINLY AFTER MIDNIGHT...ACROSS THE RIO GRANDE PLAINS
AND EDWARDS PLATEAU THEN SPREAD TO THE SOUTHEAST INTO EARLY SUNDAY
MORNING. THE MAIN THREAT FROM THESE STORMS ARE HIGH WINDS AND
HEAVY RAINFALL. ISOLATED TOTALS OF 3 TO 5 INCHES OVER ALREADY
SATURATED GROUND CAN CAUSE FURTHER RISES OF CREEKS...STREAMS...AND
CAUSE ADDITIONAL FLOODING OF LOW WATER CROSSINGS AND POOR DRAINAGE
AREAS.

.DAYS TWO AND THREE...SUNDAY THROUGH MONDAY...

A SERIES OF UPPER LEVEL DISTURBANCES WILL INTERACT WITH A MOIST
AIRMASS TO PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS SUNDAY AND
MONDAY MAINLY FOR THE HILL COUNTRY AND AUSTIN METRO AREA. LOCALLY
HEAVY RAINFALL MAY CAUSE LOCALIZED FLOODING OF
CREEKS...STREAMS...POOR DRAINAGE AREAS AND LOW WATER CROSSINGS.
ISOLATED TOTALS OF 3 TO 5 INCHES ARE POSSIBLE.

.DAYS FOUR THROUGH SEVEN...TUESDAY THROUGH FRIDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT THROUGH MONDAY.

In the hours before

Local storm report, May 15, 10:23 PM CDT, 5 hours 5 minutes before

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Local storm report, May 15, 10:38 PM CDT, 4 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1038 PM CDT SAT MAY 15 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 AM     FLASH FLOOD      LA GRANGE               29.91N  96.88W
05/15/2010                   FAYETTE            TX   EMERGENCY MNGR

            NUMEROUS ROADS CLOSED DUE TO HIGH WATER EAST OF 237 AND
            71 TO THE COUNTY LINE

&&

EVENT NUMBER EWX1000271

SBS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 7:17 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	43 min
May 15, 7:26 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	29 min
May 16, 4:14 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	46 min
May 16, 4:28 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 16, 5:54 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	51 min
May 16, 6:05 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 16, 7:25 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	50 min
May 16, 7:36 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	38 min
May 16, 9:17 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	43 min
May 16, 10:26 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 16, 11:23 AM CDT	Areal Flood Advisory	EWX	Guadalupe	2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2010 Every severe thunderstorm warning in 2010

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.