Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Austin/San Antonio, TX

May 20, 2017Burnet County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at May 20, 2017, 2:30 AM CDT for Burnet 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 as issued.

The facts

Issued: May 20, 2017, 2:30 AM CDT (07:30 UTC)
Expired: May 20, 2017, 3:15 AM CDT
In force: 45 min
Issued by: NWS Austin/San Antonio, TX

County Burnet County, TX

The radar

The Ft Hood radar (KGRK), 83 km from the middle of the area, began a volume at 07:33 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, 7.5 hours before the alert went out and 259 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: 1629 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1516 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 20.6

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 20, 12:45 AM CDT, 1 hour 45 minutes earlier.

Area forecast discussion, May 20, 12:45 AM CDT, 1 hour 45 minutes before

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
1245 AM CDT Sat May 20 2017

.UPDATE...
06Z Aviation Update Below.

&&

.AVIATION...
MVFR stratus has develop from the SAT-AUS area and northwest into
the Hill Country. The stratus will expand west toward the Rio Grande
overnight, developing at DRT after 09Z where is could become IFR
after 12Z with SHRAs potentially developing near the area.

Over the next couple of hours, TSTMs entering the far northern Hill
Country will continue southeast into the GTU-AUS corridor between
07Z-10Z. Some weakening is expected as they move into this area. A
tempo -TSRA group has been included in the AUS TAF.

A weak front will move into the Hill Country Saturday morning and
stall over southern areas in the afternoon. Additional SHRAs are
expected to re- evelop Saturday morning with possible TSRAs into the
afternoon and evening. Difficult to pinpoint exact locations and
times for TSRAs given model discrepancies in the frontal placement as
well as potential influences from mesoscale convective boundaries.
Generally VCTS is show in all TAF sites from the mid afternoon
through the evening.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              86  66  84  66  84 /  60  60  30  40  50
Austin Bergstrom Intl Airport  85  66  83  66  84 /  50  60  30  40  50
New Braunfels Muni Airport     84  67  83  67  84 /  50  60  30  40  60
Burnet Muni Airport            80  62  80  64  80 /  60  60  30  30  50
Del Rio Intl Airport           81  68  84  68  85 /  50  60  40  50  60
Georgetown Muni Airport        83  64  82  65  82 /  60  60  30  30  50
Hondo Muni Airport             84  68  85  67  85 /  50  60  30  50  60
San Marcos Muni Airport        85  67  85  66  84 /  50  60  30  40  60
La Grange - Fayette Regional   86  69  85  69  83 /  50  60  40  40  60
San Antonio Intl Airport       84  68  83  68  83 /  50  60  30  40  60
Stinson Muni Airport           84  70  83  68  84 /  50  60  30  40  60

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.

&&

Mesoscale/Aviation...Runyen
Synoptic/Grids...TB3
Public Service/Data Collection...Williams

Hazardous weather outlook, May 19, 4:32 AM CDT, 21 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
432 AM CDT Fri May 19 2017

TXZ171>173-183>194-202>209-217>225-228-201000-
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-
432 AM CDT Fri May 19 2017

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...Today And Tonight.

Isolated strong to severe storms are possible over the Edwards
Plateau and portions of the Hill Country today and tonight. Large
hail and damaging straight-line winds will be the main threats
with any isolated severe storms.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday through Monday, a slow moving cold front will bring a
threat for pockets of locally heavy rain along with isolated
strong to severe storms.

.SPOTTER INFORMATION STATEMENT...

Spotters are urged to relay severe weather, heavy rain, and
flooding reports to the National Weather Service.

In the hours before

Special weather statement, May 19, 11:37 PM CDT, 2 hours 53 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
1137 PM CDT FRI MAY 19 2017

TXZ172-173-192-200530-
Williamson TX-Burnet TX-Travis TX-
1137 PM CDT FRI MAY 19 2017

...SIGNIFICANT WEATHER ADVISORY FOR WILLIAMSON...NORTHEASTERN TRAVIS
AND BURNET COUNTIES UNTIL 1230 AM CDT...

At 1137 PM CDT, Doppler radar was tracking a strong thunderstorm over
Sunnylane, or 8 miles southeast of Lampasas, moving east at 45 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor, Burnet,
Granger, Bertram, Serenada, Buchanan Dam, Leander, Hutto, Bartlett,
Florence, Jarrell, Liberty Hill, Thrall, Weir, Inks Lake State Park
and Georgetown Dam.

LAT...LON 3091 9783 3087 9762 3074 9728 3046 9716
      3040 9733 3071 9841 3074 9837 3075 9843
      3079 9843 3083 9838 3083 9842 3086 9842
      3088 9846 3092 9845 3094 9841 3095 9845
      3101 9846 3103 9844 3103 9791
TIME...MOT...LOC 0437Z 273DEG 40KT 3096 9810

BMW

Special weather statement, May 20, 12:51 AM CDT, 1 hour 39 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
1251 AM CDT SAT MAY 20 2017

TXZ172-173-192-200645-
Williamson TX-Burnet TX-Travis TX-
1251 AM CDT SAT MAY 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR WILLIAMSON...TRAVIS AND BURNET
COUNTIES UNTIL 145 AM CDT...

At 1250 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Lampasas to near Burnet to near Blowout.
Movement was east-southeast at 30 mph.

Wind gusts up to 50 mph and small hail will be possible with these
storms. Additionally, heavy downpours totaling up to an inch and a
half of rain may be possible.

Locations impacted include...
Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
Marble Falls, Burnet, Granger, Bertram, Serenada, Anderson Mill,
Windemere, Leander, Hutto, Lakeway, Lago Vista, Manor, Granite Shoals
and Bee Cave.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Austin San Antonio.

&&

LAT...LON 3102 9806 3094 9791 3092 9783 3091 9783
      3089 9772 3075 9731 3032 9743 3018 9793
      3036 9817 3043 9813 3049 9835 3056 9835
      3057 9841 3061 9840 3067 9830 3103 9815
TIME...MOT...LOC 0550Z 286DEG 27KT 3104 9815 3072 9829 3051 9864

TB3

Special weather statement, May 20, 1:23 AM CDT, 1 hour 7 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
123 AM CDT SAT MAY 20 2017

TXZ184-186-188-200715-
Gillespie TX-Kerr TX-Edwards TX-
123 AM CDT SAT MAY 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN KERR...WESTERN GILLESPIE
AND NORTHEASTERN EDWARDS COUNTIES UNTIL 215 AM CDT...

At 121 AM CDT, Doppler radar was tracking a strong thunderstorm over
Segovia, or 7 miles southeast of Junction, moving east at 40 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Kerrville, Ingram, Mountain Home, Tivydale, Doss, Harper, Us-
83 Near The Kerr-Kimble County Line, I-10 Near The Kimble-
Kerr County Line, The Intersection Of I-10 And Us 290 and Us-
377 Near The Kimble-Edwards County Line.

LAT...LON 3041 9888 3006 9898 3017 10014 3029 10013
      3029 9930 3048 9930
TIME...MOT...LOC 0621Z 283DEG 38KT 3040 9970

BMW

Special weather statement, May 20, 2:21 AM CDT, 9 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
221 AM CDT SAT MAY 20 2017

TXZ171-188-200800-
Gillespie TX-Llano TX-
221 AM CDT SAT MAY 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR GILLESPIE AND SOUTHWESTERN LLANO
COUNTIES UNTIL 300 AM CDT...

At 221 AM CDT, Doppler radar was tracking a strong thunderstorm over
Doss, or 20 miles northwest of Fredericksburg, moving east at 35 mph.

Wind gusts up to 50 mph and small hail will be possible with this
storm.

Locations impacted include...
Fredericksburg, Stonewall, Cherry Spring, Luckenbach, Cain City,
Tivydale, Doss, Rocky Hill, Harper, Prairie Mountain, Blumenthal,
Eckert, Crabapple, Grapetown and Enchanted Rock Station.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Austin San Antonio.

&&

LAT...LON 3014 9859 3013 9930 3050 9930 3050 9896
      3067 9896 3067 9882
TIME...MOT...LOC 0721Z 248DEG 30KT 3044 9915

TB3

Special weather statement, May 20, 2:30 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
230 AM CDT SAT MAY 20 2017

TXZ172-190-200815-
Blanco TX-Burnet TX-
230 AM CDT SAT MAY 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN BLANCO AND BURNET
COUNTIES UNTIL 315 AM CDT...

At 230 AM CDT, Doppler radar was tracking a strong thunderstorm over
Horseshoe Bay, or near Round Mountain, moving east at 15 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Kingsland, Marble Falls, Burnet, Bertram, Round Mountain, Buchanan
Dam, Granite Shoals, Horseshoe Bay, Meadowlakes, Highland Haven, Inks
Lake State Park, Spicewood, Sandy, Watson, Briggs, Oatmeal, Lake
Victor, Mahomet, Sunnylane and Cypress Mill.

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 3090 9783 3079 9796 3050 9812
      3048 9812 3049 9810 3046 9810 3035 9818
      3034 9858 3050 9852 3049 9835 3056 9835
      3057 9841 3060 9840 3067 9844 3068 9840
      3070 9842 3074 9837 3075 9842 3103 9831
TIME...MOT...LOC 0730Z 248DEG 14KT 3051 9835

TB3

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 11:37 PM CDT	Special Weather Statement	EWX	Burnet, Williamson	53 min
May 20, 12:51 AM CDT	Special Weather Statement	EWX	Burnet, Williamson	54 min
May 20, 1:00 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	60 min
May 20, 1:23 AM CDT	Special Weather Statement	EWX	Gillespie	52 min
May 20, 1:57 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	48 min
May 20, 2:21 AM CDT	Special Weather Statement	EWX	Gillespie	39 min
May 20, 2:41 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	49 min
May 20, 3:05 AM CDT	Special Weather Statement	EWX	Llano	40 min
May 20, 3:16 AM CDT	Areal Flood Advisory	EWX	Burnet, Travis, Williamson	3 hr
May 20, 3:41 AM CDT	Special Weather Statement	EWX	Edwards, Val Verde	94 min
May 20, 3:54 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	66 min
May 20, 4:40 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	50 min
May 20, 5:13 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	47 min
May 20, 5:20 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	40 min
May 20, 6:00 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	48 min
May 20, 6:03 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr	46 min
May 20, 6:09 AM CDT	Special Weather Statement	EWX	Gillespie	51 min
May 20, 6:33 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	27 min
May 20, 6:52 AM CDT	Special Weather Statement	EWX	Edwards	53 min
May 20, 7:27 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kinney, Real, Uvalde	63 min
May 20, 8:26 AM CDT	Special Weather Statement	EWX	Blanco	49 min
May 20, 8:29 AM CDT	Severe Thunderstorm Warning	EWX	Uvalde	61 min
May 20, 9:28 AM CDT	Severe Thunderstorm Warning	EWX	Medina, Uvalde, Zavala	62 min
May 20, 10:13 AM CDT	Areal Flood Advisory	EWX	Medina, Uvalde	3 hr
May 20, 10:48 AM CDT	Flash Flood Warning	EWX	Medina, Uvalde	3 hr
May 20, 11:17 AM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina	58 min
May 20, 12:00 PM CDT	Areal Flood Advisory	EWX	Frio	3 hr
May 20, 12:22 PM CDT	Severe Thunderstorm Warning	EWX	Frio	68 min
May 20, 12:40 PM CDT	Flash Flood Warning	EWX	Frio	3 hr
May 20, 1:24 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Zavala	81 min
May 20, 3:04 PM CDT	Special Weather Statement	EWX	Frio	56 min
May 20, 3:12 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Zavala	48 min
May 20, 3:48 PM CDT	Special Weather Statement	EWX	Dimmit	27 min
May 20, 3:54 PM CDT	Areal Flood Advisory	EWX	Frio	3 hr

Nearby

Special Weather Statements in Texas, 2017 Every special weather statement in 2017

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.