Alert archive / Texas / Special Weather Statements in 2016

Special Weather Statement, NWS Austin/San Antonio, TX

May 10, 2016Williamson County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at May 10, 2016, 9:53 PM CDT for Williamson County, Texas. It was in force for 52 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: May 10, 2016, 9:53 PM CDT (02:53 UTC)
Expired: May 10, 2016, 10:45 PM CDT
In force: 52 min
Issued by: NWS Austin/San Antonio, TX

County Williamson County, TX

The radar

The Ft Hood radar (KGRK), 43 km from the middle of the area, began a volume at 02:55 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

Fort Worth, TX (KFWD), launched 00:00Z, 2.9 hours before the alert went out and 239 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: 3748 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1415 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 21.4

Open this sounding in Storm Lab

The text

As transmitted.

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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 May 10, 6:53 PM CDT, 3 hours earlier.

Area forecast discussion, May 10, 6:53 PM CDT, 3 hours before

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Hazardous weather outlook, May 10, 2:52 PM CDT, 7 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
252 PM CDT TUE MAY 10 2016

TXZ171>173-183>194-202>209-217>225-228-112000-
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-
252 PM CDT TUE MAY 10 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

...THERE IS A SEVERE THUNDERSTORM WATCH IN EFFECT THROUGH 10 PM
CDT...
...THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS
AFTERNOON AND EVENING FOR THE EDWARDS PLATEAU AND HILL COUNTRY
INCLUDING THE AUSTIN METROPOLITAN AREA...

SEVERE STORMS WILL BE POSSIBLE ALONG AND WEST OF THE INTERSTATE
35 CORRIDOR (INCLUDING THE AUSTIN METROPOLITAN AREA) THIS
AFTERNOON AND EVENING. THE GREATEST CHANCE FOR SEVERE STORMS WILL
BE ON THE EDWARDS PLATEAU AND NORTHERN HILL COUNTRY. STORM
DEVELOPMENT IS EXPECTED LATE IN THE AFTERNOON DURING PEAK HEATING
RESULTING IN VERY LARGE HAIL FORMATION...UP TO THE SIZE OF BASEBALLS
(2 2/3 INCHES) WITH THE STRONGEST STORMS...DAMAGING WIND GUSTS
OVER 60 MILES PER HOUR AND BRIEF HEAVY RAIN. STORMS SHOULD BEGIN
TO WEAKEN BY MIDNIGHT TONIGHT WITH THE LOSS OF DAYTIME HEATING.

ADDITIONALLY...ISOLATED STRONG TO SEVERE STORMS MAY DEVELOP WEST
OF THE RIO GRANDE RIVER AND MOVE EASTWARD IMPACTING AREAS NEAR
THE RIVER INCLUDING DEL RIO AND EAGLE PASS. LARGE HAIL AND
DAMAGING WINDS WILL ALSO BE THE MAIN THREATS WITH THIS ACTIVITY.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

AFTERNOON THUNDERSTORMS WILL REMAIN IN THE FORECAST THROUGH
FRIDAY. WIDESPREAD HAZARDOUS WEATHER IS NOT EXPECTED BUT SOME
ISOLATED STORMS MAY BECOME STRONG OR SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT SEVERE WEATHER INFORMATION TO
THE NATIONAL WEATHER SERVICE THIS AFTERNOON AND EVENING.

In the hours before

Special weather statement, May 10, 7:53 PM CDT, 2 hours before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
753 PM CDT TUE MAY 10 2016

TXZ217-110145-
MAVERICK TX-
753 PM CDT TUE MAY 10 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN MAVERICK COUNTY UNTIL
845 PM CDT...

AT 753 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
EAGLE PASS...MOVING EAST AT 35 MPH.

DIME SIZE TO NICKEL SIZED HAIL AND WIND GUSTS UP TO 50 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
EAGLE PASS...ROSITA NORTH...ROSITA SOUTH...PALOMA...RADAR BASE...ELM
CREEK...EIDSON ROAD...SECO MINES AND LAS QUINTAS FRONTERIZAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION
AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2858 10040 2860 10044 2863 10045 2864 10045
      2866 10050 2871 10051 2874 10051 2876 10053
      2880 10053 2883 10056 2909 10012 2864 10011
      2856 10040
TIME...MOT...LOC 0053Z 248DEG 30KT 2869 10060

ALLEN

Special weather statement, May 10, 8:32 PM CDT, 1 hour 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
832 PM CDT TUE MAY 10 2016

TXZ171>173-110215-
WILLIAMSON TX-BURNET TX-LLANO TX-
832 PM CDT TUE MAY 10 2016

...SIGNIFICANT WEATHER ADVISORY FOR BURNET...NORTHWESTERN WILLIAMSON
AND NORTHEASTERN LLANO COUNTIES UNTIL 915 PM CDT...

AT 831 PM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG
A LINE EXTENDING FROM NEAR LAMPASAS TO NEAR VALLEY SPRING. MOVEMENT
WAS SOUTHEAST AT 25 TO 30 MPH.

DIME SIZE TO NICKEL SIZED HAIL AND WIND GUSTS UP TO 50 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
KINGSLAND...BURNET...LLANO...BERTRAM...BUCHANAN DAM...GAINESVILLE...
FLORENCE...BLUFFTON...BRIGGS...TOW...LONE GROVE...MAHOMET...BABY HEAD...
ANDICE...SHADY GROVE...INKS LAKE STATE PARK...SUNNYLANE...STOLZ...JOPPA
AND WATSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION
AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FOR
SOUTH CENTRAL TEXAS.

LAT...LON 3091 9783 3090 9781 3079 9779 3062 9859
      3091 9887 3092 9883 3092 9842 3094 9841
      3096 9845 3098 9844 3101 9846 3103 9844
      3103 9791
TIME...MOT...LOC 0131Z 294DEG 23KT 3109 9814 3084 9874

ALLEN

Special weather statement, May 10, 9:53 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
953 PM CDT TUE MAY 10 2016

TXZ172-173-110345-
WILLIAMSON TX-BURNET TX-
953 PM CDT TUE MAY 10 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BURNET AND WESTERN
WILLIAMSON COUNTIES UNTIL 1045 PM CDT...

AT 952 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
JOPPA...OR 7 MILES NORTH OF BERTRAM...MOVING EAST AT 50 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ROUND ROCK...CEDAR PARK...GEORGETOWN...BERTRAM...SERENADA...LEANDER...
HUTTO...FLORENCE...JARRELL...LIBERTY HILL...WEIR...GEORGETOWN DAM...
OATMEAL...ANDICE...SUN CITY...SHADY GROVE...WATSON...BRIGGS...MAHOMET AND
SUNNYLANE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION
AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3103 9791 3091 9783 3087 9763 3082 9750
      3048 9755 3050 9758 3049 9763 3059 9792
      3060 9792 3063 9795 3061 9799 3067 9815
      3103 9816
TIME...MOT...LOC 0252Z 271DEG 45KT 3085 9801

ALLEN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:53 PM CDT	Special Weather Statement	EWX	Maverick	52 min
May 10, 8:32 PM CDT	Special Weather Statement	EWX	Burnet	43 min
May 11, 1:01 AM CDT	Special Weather Statement	EWX	Kerr	29 min
May 11, 1:26 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kerr	64 min
May 11, 1:29 AM CDT	Special Weather Statement	EWX	Llano	31 min
May 11, 1:57 AM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr, Medina	33 min
May 11, 3:41 AM CDT	Special Weather Statement	EWX	Bexar	49 min
May 11, 4:23 AM CDT	Areal Flood Advisory	EWX	Bexar	3 hr
May 11, 4:29 AM CDT	Special Weather Statement	EWX	Wilson	46 min
May 11, 5:01 AM CDT	Special Weather Statement	EWX	Bexar	44 min
May 11, 5:05 AM CDT	Severe Thunderstorm Warning	EWX	Bexar, Gonzales, Guadalupe, Wilson	55 min
May 11, 6:14 AM CDT	Special Weather Statement	EWX	Bexar	46 min

Nearby

Special Weather Statements in Texas, 2016 Every special weather statement in 2016

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.