Alert archive / Texas / Special Weather Statements in 2015

Special Weather Statement, NWS Austin/San Antonio, TX

July 31, 2015Llano County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at Jul 31, 2015, 8:25 PM CDT for Llano County, Texas. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 31, 2015, 8:25 PM CDT (01:25 UTC)
Expired: Jul 31, 2015, 9:00 PM CDT
In force: 35 min
Issued by: NWS Austin/San Antonio, TX

County Llano County, TX

The radar

The Austin/San Antonio radar (KEWX), 107 km from the middle of the area, began a volume at 01:28 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 (KDLF), launched 00:00Z, 1.4 hours before the alert went out and 247 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: 589 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 2248 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 31, 6:55 PM CDT, 1 hour 30 minutes earlier.

Area forecast discussion, Jul 31, 6:55 PM CDT, 1 hour 30 minutes before

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Hazardous weather outlook, Jul 31, 7:06 PM CDT, 1 hour 19 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
706 PM CDT FRI JUL 31 2015

TXZ171>173-183>194-202>209-217>225-228-010945-
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-
706 PM CDT FRI JUL 31 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TONIGHT.

ISOLATED THUNDERSTORMS ACROSS THE SOUTHERN PART OF THE RIO GRANDE
PLAINS MAY PRODUCE WIND GUSTS OF 40 TO 50 MPH. THIS ACTIVITY IS
EXPECTED TO LAST FOR THE NEXT TWO HOURS BEFORE DISSIPATING/GOING
AWAY. NO OTHER HAZARD IS EXPECTED THROUGH THE PERIOD.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

A CHANCE OF THUNDERSTORMS ON SATURDAY AND WILL ONCE AGAIN BRING A
THREAT OF STRONG GUSTY WINDS IN EXCESS OF 50 MPH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

In the hours before

Special weather statement, Jul 31, 3:30 PM CDT, 4 hours 55 minutes before

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Special weather statement, Jul 31, 8:25 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
825 PM CDT FRI JUL 31 2015

TXZ171-188-010200-
LLANO TX-GILLESPIE TX-
825 PM CDT FRI JUL 31 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL LLANO AND
NORTHEASTERN GILLESPIE COUNTIES UNTIL 900 PM CDT...

AT 821 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
OXFORD...OR 13 MILES SOUTHWEST OF KINGSLAND...MOVING WEST AT 15 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

THIS STORM LOOKS TO CROSS THE LLANO AND GILLESPIE COUNTY LINE JUST
EAST OF ENCHANTED ROCK NEAR STATE HIGHWAY 16.

LAT...LON 3050 9855 3050 9859 3048 9859 3041 9873
      3056 9882 3060 9863
TIME...MOT...LOC 0121Z 068DEG 12KT 3054 9863

YURA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 10:31 PM CDT	Special Weather Statement	EWX	Kerr	44 min

Nearby

Special Weather Statements in Texas, 2015 Every special weather statement in 2015

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.